[gentoo-commits] proj/linux-patches:4.4 commit in: /

[Mike Pagano]

commit:     e7455da9070ebec0d5c0d59fe2445fa9a5bd4b7d
Author:     Mike Pagano <mpagano <AT> gentoo <DOT> org>
AuthorDate: Sat Apr  8 13:56:24 2017 +0000
Commit:     Mike Pagano <mpagano <AT> gentoo <DOT> org>
CommitDate: Sat Apr  8 13:56:24 2017 +0000
URL:        https://gitweb.gentoo.org/proj/linux-patches.git/commit/?id=e7455da9

Linux patch 4.4.60

 0000_README             |    4 +
 1059_linux-4.4.60.patch | 1175 +++++++++++++++++++++++++++++++++++++++++++++++
 2 files changed, 1179 insertions(+)

diff --git a/0000_README b/0000_README
index 1be1dd6..6cc653c 100644
--- a/0000_README
+++ b/0000_README
@@ -279,6 +279,10 @@ Patch:  1058_linux-4.4.59.patch
 From:   http://www.kernel.org
 Desc:   Linux 4.4.59
 
+Patch:  1059_linux-4.4.60.patch
+From:   http://www.kernel.org
+Desc:   Linux 4.4.60
+
 Patch:  1500_XATTR_USER_PREFIX.patch
 From:   https://bugs.gentoo.org/show_bug.cgi?id=470644
 Desc:   Support for namespace user.pax.* on tmpfs.

diff --git a/1059_linux-4.4.60.patch b/1059_linux-4.4.60.patch
new file mode 100644
index 0000000..ad96b85
--- /dev/null
+++ b/1059_linux-4.4.60.patch
@@ -0,0 +1,1175 @@
+diff --git a/Makefile b/Makefile
+index 083724c6ca4d..fb7c2b40753d 100644
+--- a/Makefile
++++ b/Makefile
+@@ -1,6 +1,6 @@
+ VERSION = 4
+ PATCHLEVEL = 4
+-SUBLEVEL = 59
++SUBLEVEL = 60
+ EXTRAVERSION =
+ NAME = Blurry Fish Butt
+ 
+diff --git a/arch/mips/lantiq/irq.c b/arch/mips/lantiq/irq.c
+index 2e7f60c9fc5d..51cdc46a87e2 100644
+--- a/arch/mips/lantiq/irq.c
++++ b/arch/mips/lantiq/irq.c
+@@ -269,6 +269,11 @@ static void ltq_hw5_irqdispatch(void)
+ DEFINE_HWx_IRQDISPATCH(5)
+ #endif
+ 
++static void ltq_hw_irq_handler(struct irq_desc *desc)
++{
++	ltq_hw_irqdispatch(irq_desc_get_irq(desc) - 2);
++}
++
+ #ifdef CONFIG_MIPS_MT_SMP
+ void __init arch_init_ipiirq(int irq, struct irqaction *action)
+ {
+@@ -313,23 +318,19 @@ static struct irqaction irq_call = {
+ asmlinkage void plat_irq_dispatch(void)
+ {
+ 	unsigned int pending = read_c0_status() & read_c0_cause() & ST0_IM;
+-	unsigned int i;
+-
+-	if ((MIPS_CPU_TIMER_IRQ == 7) && (pending & CAUSEF_IP7)) {
+-		do_IRQ(MIPS_CPU_TIMER_IRQ);
+-		goto out;
+-	} else {
+-		for (i = 0; i < MAX_IM; i++) {
+-			if (pending & (CAUSEF_IP2 << i)) {
+-				ltq_hw_irqdispatch(i);
+-				goto out;
+-			}
+-		}
++	int irq;
++
++	if (!pending) {
++		spurious_interrupt();
++		return;
+ 	}
+-	pr_alert("Spurious IRQ: CAUSE=0x%08x\n", read_c0_status());
+ 
+-out:
+-	return;
++	pending >>= CAUSEB_IP;
++	while (pending) {
++		irq = fls(pending) - 1;
++		do_IRQ(MIPS_CPU_IRQ_BASE + irq);
++		pending &= ~BIT(irq);
++	}
+ }
+ 
+ static int icu_map(struct irq_domain *d, unsigned int irq, irq_hw_number_t hw)
+@@ -354,11 +355,6 @@ static const struct irq_domain_ops irq_domain_ops = {
+ 	.map = icu_map,
+ };
+ 
+-static struct irqaction cascade = {
+-	.handler = no_action,
+-	.name = "cascade",
+-};
+-
+ int __init icu_of_init(struct device_node *node, struct device_node *parent)
+ {
+ 	struct device_node *eiu_node;
+@@ -390,7 +386,7 @@ int __init icu_of_init(struct device_node *node, struct device_node *parent)
+ 	mips_cpu_irq_init();
+ 
+ 	for (i = 0; i < MAX_IM; i++)
+-		setup_irq(i + 2, &cascade);
++		irq_set_chained_handler(i + 2, ltq_hw_irq_handler);
+ 
+ 	if (cpu_has_vint) {
+ 		pr_info("Setting up vectored interrupts\n");
+diff --git a/arch/x86/xen/setup.c b/arch/x86/xen/setup.c
+index e345891450c3..df8844a1853a 100644
+--- a/arch/x86/xen/setup.c
++++ b/arch/x86/xen/setup.c
+@@ -713,10 +713,9 @@ static void __init xen_reserve_xen_mfnlist(void)
+ 		size = PFN_PHYS(xen_start_info->nr_p2m_frames);
+ 	}
+ 
+-	if (!xen_is_e820_reserved(start, size)) {
+-		memblock_reserve(start, size);
++	memblock_reserve(start, size);
++	if (!xen_is_e820_reserved(start, size))
+ 		return;
+-	}
+ 
+ #ifdef CONFIG_X86_32
+ 	/*
+@@ -727,6 +726,7 @@ static void __init xen_reserve_xen_mfnlist(void)
+ 	BUG();
+ #else
+ 	xen_relocate_p2m();
++	memblock_free(start, size);
+ #endif
+ }
+ 
+diff --git a/block/bio.c b/block/bio.c
+index 46e2cc1d4016..14263fab94d3 100644
+--- a/block/bio.c
++++ b/block/bio.c
+@@ -373,10 +373,14 @@ static void punt_bios_to_rescuer(struct bio_set *bs)
+ 	bio_list_init(&punt);
+ 	bio_list_init(&nopunt);
+ 
+-	while ((bio = bio_list_pop(current->bio_list)))
++	while ((bio = bio_list_pop(&current->bio_list[0])))
+ 		bio_list_add(bio->bi_pool == bs ? &punt : &nopunt, bio);
++	current->bio_list[0] = nopunt;
+ 
+-	*current->bio_list = nopunt;
++	bio_list_init(&nopunt);
++	while ((bio = bio_list_pop(&current->bio_list[1])))
++		bio_list_add(bio->bi_pool == bs ? &punt : &nopunt, bio);
++	current->bio_list[1] = nopunt;
+ 
+ 	spin_lock(&bs->rescue_lock);
+ 	bio_list_merge(&bs->rescue_list, &punt);
+@@ -464,7 +468,9 @@ struct bio *bio_alloc_bioset(gfp_t gfp_mask, int nr_iovecs, struct bio_set *bs)
+ 		 * we retry with the original gfp_flags.
+ 		 */
+ 
+-		if (current->bio_list && !bio_list_empty(current->bio_list))
++		if (current->bio_list &&
++		    (!bio_list_empty(&current->bio_list[0]) ||
++		     !bio_list_empty(&current->bio_list[1])))
+ 			gfp_mask &= ~__GFP_DIRECT_RECLAIM;
+ 
+ 		p = mempool_alloc(bs->bio_pool, gfp_mask);
+diff --git a/block/blk-core.c b/block/blk-core.c
+index 4fab5d610805..ef083e7a37c5 100644
+--- a/block/blk-core.c
++++ b/block/blk-core.c
+@@ -2021,7 +2021,14 @@ end_io:
+  */
+ blk_qc_t generic_make_request(struct bio *bio)
+ {
+-	struct bio_list bio_list_on_stack;
++	/*
++	 * bio_list_on_stack[0] contains bios submitted by the current
++	 * make_request_fn.
++	 * bio_list_on_stack[1] contains bios that were submitted before
++	 * the current make_request_fn, but that haven't been processed
++	 * yet.
++	 */
++	struct bio_list bio_list_on_stack[2];
+ 	blk_qc_t ret = BLK_QC_T_NONE;
+ 
+ 	if (!generic_make_request_checks(bio))
+@@ -2038,7 +2045,7 @@ blk_qc_t generic_make_request(struct bio *bio)
+ 	 * should be added at the tail
+ 	 */
+ 	if (current->bio_list) {
+-		bio_list_add(current->bio_list, bio);
++		bio_list_add(&current->bio_list[0], bio);
+ 		goto out;
+ 	}
+ 
+@@ -2057,24 +2064,39 @@ blk_qc_t generic_make_request(struct bio *bio)
+ 	 * bio_list, and call into ->make_request() again.
+ 	 */
+ 	BUG_ON(bio->bi_next);
+-	bio_list_init(&bio_list_on_stack);
+-	current->bio_list = &bio_list_on_stack;
++	bio_list_init(&bio_list_on_stack[0]);
++	current->bio_list = bio_list_on_stack;
+ 	do {
+ 		struct request_queue *q = bdev_get_queue(bio->bi_bdev);
+ 
+ 		if (likely(blk_queue_enter(q, __GFP_DIRECT_RECLAIM) == 0)) {
++			struct bio_list lower, same;
++
++			/* Create a fresh bio_list for all subordinate requests */
++			bio_list_on_stack[1] = bio_list_on_stack[0];
++			bio_list_init(&bio_list_on_stack[0]);
+ 
+ 			ret = q->make_request_fn(q, bio);
+ 
+ 			blk_queue_exit(q);
+-
+-			bio = bio_list_pop(current->bio_list);
++			/* sort new bios into those for a lower level
++			 * and those for the same level
++			 */
++			bio_list_init(&lower);
++			bio_list_init(&same);
++			while ((bio = bio_list_pop(&bio_list_on_stack[0])) != NULL)
++				if (q == bdev_get_queue(bio->bi_bdev))
++					bio_list_add(&same, bio);
++				else
++					bio_list_add(&lower, bio);
++			/* now assemble so we handle the lowest level first */
++			bio_list_merge(&bio_list_on_stack[0], &lower);
++			bio_list_merge(&bio_list_on_stack[0], &same);
++			bio_list_merge(&bio_list_on_stack[0], &bio_list_on_stack[1]);
+ 		} else {
+-			struct bio *bio_next = bio_list_pop(current->bio_list);
+-
+ 			bio_io_error(bio);
+-			bio = bio_next;
+ 		}
++		bio = bio_list_pop(&bio_list_on_stack[0]);
+ 	} while (bio);
+ 	current->bio_list = NULL; /* deactivate */
+ 
+diff --git a/drivers/acpi/Makefile b/drivers/acpi/Makefile
+index 675eaf337178..b9cebca376f9 100644
+--- a/drivers/acpi/Makefile
++++ b/drivers/acpi/Makefile
+@@ -2,7 +2,6 @@
+ # Makefile for the Linux ACPI interpreter
+ #
+ 
+-ccflags-y			:= -Os
+ ccflags-$(CONFIG_ACPI_DEBUG)	+= -DACPI_DEBUG_OUTPUT
+ 
+ #
+diff --git a/drivers/acpi/acpi_platform.c b/drivers/acpi/acpi_platform.c
+index 296b7a14893a..5365ff6e69c1 100644
+--- a/drivers/acpi/acpi_platform.c
++++ b/drivers/acpi/acpi_platform.c
+@@ -24,9 +24,11 @@
+ ACPI_MODULE_NAME("platform");
+ 
+ static const struct acpi_device_id forbidden_id_list[] = {
+-	{"PNP0000", 0},	/* PIC */
+-	{"PNP0100", 0},	/* Timer */
+-	{"PNP0200", 0},	/* AT DMA Controller */
++	{"PNP0000",  0},	/* PIC */
++	{"PNP0100",  0},	/* Timer */
++	{"PNP0200",  0},	/* AT DMA Controller */
++	{"ACPI0009", 0},	/* IOxAPIC */
++	{"ACPI000A", 0},	/* IOAPIC */
+ 	{"", 0},
+ };
+ 
+diff --git a/drivers/gpu/drm/radeon/radeon_ttm.c b/drivers/gpu/drm/radeon/radeon_ttm.c
+index 35310336dd0a..d684e2b79d2b 100644
+--- a/drivers/gpu/drm/radeon/radeon_ttm.c
++++ b/drivers/gpu/drm/radeon/radeon_ttm.c
+@@ -213,8 +213,8 @@ static void radeon_evict_flags(struct ttm_buffer_object *bo,
+ 			rbo->placement.num_busy_placement = 0;
+ 			for (i = 0; i < rbo->placement.num_placement; i++) {
+ 				if (rbo->placements[i].flags & TTM_PL_FLAG_VRAM) {
+-					if (rbo->placements[0].fpfn < fpfn)
+-						rbo->placements[0].fpfn = fpfn;
++					if (rbo->placements[i].fpfn < fpfn)
++						rbo->placements[i].fpfn = fpfn;
+ 				} else {
+ 					rbo->placement.busy_placement =
+ 						&rbo->placements[i];
+diff --git a/drivers/md/dm.c b/drivers/md/dm.c
+index 397f0454100b..320eb3c4bb6b 100644
+--- a/drivers/md/dm.c
++++ b/drivers/md/dm.c
+@@ -1481,26 +1481,29 @@ static void flush_current_bio_list(struct blk_plug_cb *cb, bool from_schedule)
+ 	struct dm_offload *o = container_of(cb, struct dm_offload, cb);
+ 	struct bio_list list;
+ 	struct bio *bio;
++	int i;
+ 
+ 	INIT_LIST_HEAD(&o->cb.list);
+ 
+ 	if (unlikely(!current->bio_list))
+ 		return;
+ 
+-	list = *current->bio_list;
+-	bio_list_init(current->bio_list);
+-
+-	while ((bio = bio_list_pop(&list))) {
+-		struct bio_set *bs = bio->bi_pool;
+-		if (unlikely(!bs) || bs == fs_bio_set) {
+-			bio_list_add(current->bio_list, bio);
+-			continue;
++	for (i = 0; i < 2; i++) {
++		list = current->bio_list[i];
++		bio_list_init(&current->bio_list[i]);
++
++		while ((bio = bio_list_pop(&list))) {
++			struct bio_set *bs = bio->bi_pool;
++			if (unlikely(!bs) || bs == fs_bio_set) {
++				bio_list_add(&current->bio_list[i], bio);
++				continue;
++			}
++
++			spin_lock(&bs->rescue_lock);
++			bio_list_add(&bs->rescue_list, bio);
++			queue_work(bs->rescue_workqueue, &bs->rescue_work);
++			spin_unlock(&bs->rescue_lock);
+ 		}
+-
+-		spin_lock(&bs->rescue_lock);
+-		bio_list_add(&bs->rescue_list, bio);
+-		queue_work(bs->rescue_workqueue, &bs->rescue_work);
+-		spin_unlock(&bs->rescue_lock);
+ 	}
+ }
+ 
+diff --git a/drivers/md/raid1.c b/drivers/md/raid1.c
+index 515554c7365b..9be39988bf06 100644
+--- a/drivers/md/raid1.c
++++ b/drivers/md/raid1.c
+@@ -877,7 +877,8 @@ static sector_t wait_barrier(struct r1conf *conf, struct bio *bio)
+ 				     ((conf->start_next_window <
+ 				       conf->next_resync + RESYNC_SECTORS) &&
+ 				      current->bio_list &&
+-				      !bio_list_empty(current->bio_list))),
++				     (!bio_list_empty(&current->bio_list[0]) ||
++				      !bio_list_empty(&current->bio_list[1])))),
+ 				    conf->resync_lock);
+ 		conf->nr_waiting--;
+ 	}
+diff --git a/drivers/md/raid10.c b/drivers/md/raid10.c
+index a92979e704e3..e5ee4e9e0ea5 100644
+--- a/drivers/md/raid10.c
++++ b/drivers/md/raid10.c
+@@ -946,7 +946,8 @@ static void wait_barrier(struct r10conf *conf)
+ 				    !conf->barrier ||
+ 				    (conf->nr_pending &&
+ 				     current->bio_list &&
+-				     !bio_list_empty(current->bio_list)),
++				     (!bio_list_empty(&current->bio_list[0]) ||
++				      !bio_list_empty(&current->bio_list[1]))),
+ 				    conf->resync_lock);
+ 		conf->nr_waiting--;
+ 	}
+diff --git a/drivers/power/reset/at91-poweroff.c b/drivers/power/reset/at91-poweroff.c
+index e9e24df35f26..2579f025b90b 100644
+--- a/drivers/power/reset/at91-poweroff.c
++++ b/drivers/power/reset/at91-poweroff.c
+@@ -14,9 +14,12 @@
+ #include <linux/io.h>
+ #include <linux/module.h>
+ #include <linux/of.h>
++#include <linux/of_address.h>
+ #include <linux/platform_device.h>
+ #include <linux/printk.h>
+ 
++#include <soc/at91/at91sam9_ddrsdr.h>
++
+ #define AT91_SHDW_CR	0x00		/* Shut Down Control Register */
+ #define AT91_SHDW_SHDW		BIT(0)			/* Shut Down command */
+ #define AT91_SHDW_KEY		(0xa5 << 24)		/* KEY Password */
+@@ -50,6 +53,7 @@ static const char *shdwc_wakeup_modes[] = {
+ 
+ static void __iomem *at91_shdwc_base;
+ static struct clk *sclk;
++static void __iomem *mpddrc_base;
+ 
+ static void __init at91_wakeup_status(void)
+ {
+@@ -73,6 +77,29 @@ static void at91_poweroff(void)
+ 	writel(AT91_SHDW_KEY | AT91_SHDW_SHDW, at91_shdwc_base + AT91_SHDW_CR);
+ }
+ 
++static void at91_lpddr_poweroff(void)
++{
++	asm volatile(
++		/* Align to cache lines */
++		".balign 32\n\t"
++
++		/* Ensure AT91_SHDW_CR is in the TLB by reading it */
++		"	ldr	r6, [%2, #" __stringify(AT91_SHDW_CR) "]\n\t"
++
++		/* Power down SDRAM0 */
++		"	str	%1, [%0, #" __stringify(AT91_DDRSDRC_LPR) "]\n\t"
++		/* Shutdown CPU */
++		"	str	%3, [%2, #" __stringify(AT91_SHDW_CR) "]\n\t"
++
++		"	b	.\n\t"
++		:
++		: "r" (mpddrc_base),
++		  "r" cpu_to_le32(AT91_DDRSDRC_LPDDR2_PWOFF),
++		  "r" (at91_shdwc_base),
++		  "r" cpu_to_le32(AT91_SHDW_KEY | AT91_SHDW_SHDW)
++		: "r0");
++}
++
+ static int at91_poweroff_get_wakeup_mode(struct device_node *np)
+ {
+ 	const char *pm;
+@@ -124,6 +151,8 @@ static void at91_poweroff_dt_set_wakeup_mode(struct platform_device *pdev)
+ static int __init at91_poweroff_probe(struct platform_device *pdev)
+ {
+ 	struct resource *res;
++	struct device_node *np;
++	u32 ddr_type;
+ 	int ret;
+ 
+ 	res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
+@@ -150,12 +179,30 @@ static int __init at91_poweroff_probe(struct platform_device *pdev)
+ 
+ 	pm_power_off = at91_poweroff;
+ 
++	np = of_find_compatible_node(NULL, NULL, "atmel,sama5d3-ddramc");
++	if (!np)
++		return 0;
++
++	mpddrc_base = of_iomap(np, 0);
++	of_node_put(np);
++
++	if (!mpddrc_base)
++		return 0;
++
++	ddr_type = readl(mpddrc_base + AT91_DDRSDRC_MDR) & AT91_DDRSDRC_MD;
++	if ((ddr_type == AT91_DDRSDRC_MD_LPDDR2) ||
++	    (ddr_type == AT91_DDRSDRC_MD_LPDDR3))
++		pm_power_off = at91_lpddr_poweroff;
++	else
++		iounmap(mpddrc_base);
++
+ 	return 0;
+ }
+ 
+ static int __exit at91_poweroff_remove(struct platform_device *pdev)
+ {
+-	if (pm_power_off == at91_poweroff)
++	if (pm_power_off == at91_poweroff ||
++	    pm_power_off == at91_lpddr_poweroff)
+ 		pm_power_off = NULL;
+ 
+ 	clk_disable_unprepare(sclk);
+@@ -163,6 +210,11 @@ static int __exit at91_poweroff_remove(struct platform_device *pdev)
+ 	return 0;
+ }
+ 
++static const struct of_device_id at91_ramc_of_match[] = {
++	{ .compatible = "atmel,sama5d3-ddramc", },
++	{ /* sentinel */ }
++};
++
+ static const struct of_device_id at91_poweroff_of_match[] = {
+ 	{ .compatible = "atmel,at91sam9260-shdwc", },
+ 	{ .compatible = "atmel,at91sam9rl-shdwc", },
+diff --git a/drivers/rtc/rtc-s35390a.c b/drivers/rtc/rtc-s35390a.c
+index f40afdd0e5f5..00662dd28d66 100644
+--- a/drivers/rtc/rtc-s35390a.c
++++ b/drivers/rtc/rtc-s35390a.c
+@@ -15,6 +15,7 @@
+ #include <linux/bitrev.h>
+ #include <linux/bcd.h>
+ #include <linux/slab.h>
++#include <linux/delay.h>
+ 
+ #define S35390A_CMD_STATUS1	0
+ #define S35390A_CMD_STATUS2	1
+@@ -34,10 +35,14 @@
+ #define S35390A_ALRM_BYTE_HOURS	1
+ #define S35390A_ALRM_BYTE_MINS	2
+ 
++/* flags for STATUS1 */
+ #define S35390A_FLAG_POC	0x01
+ #define S35390A_FLAG_BLD	0x02
++#define S35390A_FLAG_INT2	0x04
+ #define S35390A_FLAG_24H	0x40
+ #define S35390A_FLAG_RESET	0x80
++
++/* flag for STATUS2 */
+ #define S35390A_FLAG_TEST	0x01
+ 
+ #define S35390A_INT2_MODE_MASK		0xF0
+@@ -94,19 +99,63 @@ static int s35390a_get_reg(struct s35390a *s35390a, int reg, char *buf, int len)
+ 	return 0;
+ }
+ 
+-static int s35390a_reset(struct s35390a *s35390a)
++/*
++ * Returns <0 on error, 0 if rtc is setup fine and 1 if the chip was reset.
++ * To keep the information if an irq is pending, pass the value read from
++ * STATUS1 to the caller.
++ */
++static int s35390a_reset(struct s35390a *s35390a, char *status1)
+ {
+-	char buf[1];
+-
+-	if (s35390a_get_reg(s35390a, S35390A_CMD_STATUS1, buf, sizeof(buf)) < 0)
+-		return -EIO;
+-
+-	if (!(buf[0] & (S35390A_FLAG_POC | S35390A_FLAG_BLD)))
++	char buf;
++	int ret;
++	unsigned initcount = 0;
++
++	ret = s35390a_get_reg(s35390a, S35390A_CMD_STATUS1, status1, 1);
++	if (ret < 0)
++		return ret;
++
++	if (*status1 & S35390A_FLAG_POC)
++		/*
++		 * Do not communicate for 0.5 seconds since the power-on
++		 * detection circuit is in operation.
++		 */
++		msleep(500);
++	else if (!(*status1 & S35390A_FLAG_BLD))
++		/*
++		 * If both POC and BLD are unset everything is fine.
++		 */
+ 		return 0;
+ 
+-	buf[0] |= (S35390A_FLAG_RESET | S35390A_FLAG_24H);
+-	buf[0] &= 0xf0;
+-	return s35390a_set_reg(s35390a, S35390A_CMD_STATUS1, buf, sizeof(buf));
++	/*
++	 * At least one of POC and BLD are set, so reinitialise chip. Keeping
++	 * this information in the hardware to know later that the time isn't
++	 * valid is unfortunately not possible because POC and BLD are cleared
++	 * on read. So the reset is best done now.
++	 *
++	 * The 24H bit is kept over reset, so set it already here.
++	 */
++initialize:
++	*status1 = S35390A_FLAG_24H;
++	buf = S35390A_FLAG_RESET | S35390A_FLAG_24H;
++	ret = s35390a_set_reg(s35390a, S35390A_CMD_STATUS1, &buf, 1);
++
++	if (ret < 0)
++		return ret;
++
++	ret = s35390a_get_reg(s35390a, S35390A_CMD_STATUS1, &buf, 1);
++	if (ret < 0)
++		return ret;
++
++	if (buf & (S35390A_FLAG_POC | S35390A_FLAG_BLD)) {
++		/* Try up to five times to reset the chip */
++		if (initcount < 5) {
++			++initcount;
++			goto initialize;
++		} else
++			return -EIO;
++	}
++
++	return 1;
+ }
+ 
+ static int s35390a_disable_test_mode(struct s35390a *s35390a)
+@@ -242,6 +291,8 @@ static int s35390a_set_alarm(struct i2c_client *client, struct rtc_wkalrm *alm)
+ 
+ 	if (alm->time.tm_wday != -1)
+ 		buf[S35390A_ALRM_BYTE_WDAY] = bin2bcd(alm->time.tm_wday) | 0x80;
++	else
++		buf[S35390A_ALRM_BYTE_WDAY] = 0;
+ 
+ 	buf[S35390A_ALRM_BYTE_HOURS] = s35390a_hr2reg(s35390a,
+ 			alm->time.tm_hour) | 0x80;
+@@ -265,27 +316,61 @@ static int s35390a_read_alarm(struct i2c_client *client, struct rtc_wkalrm *alm)
+ 	char buf[3], sts;
+ 	int i, err;
+ 
++	/*
++	 * initialize all members to -1 to signal the core that they are not
++	 * defined by the hardware.
++	 */
++	alm->time.tm_sec = -1;
++	alm->time.tm_min = -1;
++	alm->time.tm_hour = -1;
++	alm->time.tm_mday = -1;
++	alm->time.tm_mon = -1;
++	alm->time.tm_year = -1;
++	alm->time.tm_wday = -1;
++	alm->time.tm_yday = -1;
++	alm->time.tm_isdst = -1;
++
+ 	err = s35390a_get_reg(s35390a, S35390A_CMD_STATUS2, &sts, sizeof(sts));
+ 	if (err < 0)
+ 		return err;
+ 
+-	if (bitrev8(sts) != S35390A_INT2_MODE_ALARM)
+-		return -EINVAL;
++	if ((bitrev8(sts) & S35390A_INT2_MODE_MASK) != S35390A_INT2_MODE_ALARM) {
++		/*
++		 * When the alarm isn't enabled, the register to configure
++		 * the alarm time isn't accessible.
++		 */
++		alm->enabled = 0;
++		return 0;
++	} else {
++		alm->enabled = 1;
++	}
+ 
+ 	err = s35390a_get_reg(s35390a, S35390A_CMD_INT2_REG1, buf, sizeof(buf));
+ 	if (err < 0)
+ 		return err;
+ 
+ 	/* This chip returns the bits of each byte in reverse order */
+-	for (i = 0; i < 3; ++i) {
++	for (i = 0; i < 3; ++i)
+ 		buf[i] = bitrev8(buf[i]);
+-		buf[i] &= ~0x80;
+-	}
+ 
+-	alm->time.tm_wday = bcd2bin(buf[S35390A_ALRM_BYTE_WDAY]);
+-	alm->time.tm_hour = s35390a_reg2hr(s35390a,
+-						buf[S35390A_ALRM_BYTE_HOURS]);
+-	alm->time.tm_min = bcd2bin(buf[S35390A_ALRM_BYTE_MINS]);
++	/*
++	 * B0 of the three matching registers is an enable flag. Iff it is set
++	 * the configured value is used for matching.
++	 */
++	if (buf[S35390A_ALRM_BYTE_WDAY] & 0x80)
++		alm->time.tm_wday =
++			bcd2bin(buf[S35390A_ALRM_BYTE_WDAY] & ~0x80);
++
++	if (buf[S35390A_ALRM_BYTE_HOURS] & 0x80)
++		alm->time.tm_hour =
++			s35390a_reg2hr(s35390a,
++				       buf[S35390A_ALRM_BYTE_HOURS] & ~0x80);
++
++	if (buf[S35390A_ALRM_BYTE_MINS] & 0x80)
++		alm->time.tm_min = bcd2bin(buf[S35390A_ALRM_BYTE_MINS] & ~0x80);
++
++	/* alarm triggers always at s=0 */
++	alm->time.tm_sec = 0;
+ 
+ 	dev_dbg(&client->dev, "%s: alm is mins=%d, hours=%d, wday=%d\n",
+ 			__func__, alm->time.tm_min, alm->time.tm_hour,
+@@ -327,11 +412,11 @@ static struct i2c_driver s35390a_driver;
+ static int s35390a_probe(struct i2c_client *client,
+ 			 const struct i2c_device_id *id)
+ {
+-	int err;
++	int err, err_reset;
+ 	unsigned int i;
+ 	struct s35390a *s35390a;
+ 	struct rtc_time tm;
+-	char buf[1];
++	char buf, status1;
+ 
+ 	if (!i2c_check_functionality(client->adapter, I2C_FUNC_I2C)) {
+ 		err = -ENODEV;
+@@ -360,29 +445,35 @@ static int s35390a_probe(struct i2c_client *client,
+ 		}
+ 	}
+ 
+-	err = s35390a_reset(s35390a);
+-	if (err < 0) {
++	err_reset = s35390a_reset(s35390a, &status1);
++	if (err_reset < 0) {
++		err = err_reset;
+ 		dev_err(&client->dev, "error resetting chip\n");
+ 		goto exit_dummy;
+ 	}
+ 
+-	err = s35390a_disable_test_mode(s35390a);
+-	if (err < 0) {
+-		dev_err(&client->dev, "error disabling test mode\n");
+-		goto exit_dummy;
+-	}
+-
+-	err = s35390a_get_reg(s35390a, S35390A_CMD_STATUS1, buf, sizeof(buf));
+-	if (err < 0) {
+-		dev_err(&client->dev, "error checking 12/24 hour mode\n");
+-		goto exit_dummy;
+-	}
+-	if (buf[0] & S35390A_FLAG_24H)
++	if (status1 & S35390A_FLAG_24H)
+ 		s35390a->twentyfourhour = 1;
+ 	else
+ 		s35390a->twentyfourhour = 0;
+ 
+-	if (s35390a_get_datetime(client, &tm) < 0)
++	if (status1 & S35390A_FLAG_INT2) {
++		/* disable alarm (and maybe test mode) */
++		buf = 0;
++		err = s35390a_set_reg(s35390a, S35390A_CMD_STATUS2, &buf, 1);
++		if (err < 0) {
++			dev_err(&client->dev, "error disabling alarm");
++			goto exit_dummy;
++		}
++	} else {
++		err = s35390a_disable_test_mode(s35390a);
++		if (err < 0) {
++			dev_err(&client->dev, "error disabling test mode\n");
++			goto exit_dummy;
++		}
++	}
++
++	if (err_reset > 0 || s35390a_get_datetime(client, &tm) < 0)
+ 		dev_warn(&client->dev, "clock needs to be set\n");
+ 
+ 	device_set_wakeup_capable(&client->dev, 1);
+@@ -395,6 +486,10 @@ static int s35390a_probe(struct i2c_client *client,
+ 		err = PTR_ERR(s35390a->rtc);
+ 		goto exit_dummy;
+ 	}
++
++	if (status1 & S35390A_FLAG_INT2)
++		rtc_update_irq(s35390a->rtc, 1, RTC_AF);
++
+ 	return 0;
+ 
+ exit_dummy:
+diff --git a/drivers/scsi/libsas/sas_ata.c b/drivers/scsi/libsas/sas_ata.c
+index 9c706d8c1441..6f5e2720ffad 100644
+--- a/drivers/scsi/libsas/sas_ata.c
++++ b/drivers/scsi/libsas/sas_ata.c
+@@ -218,7 +218,7 @@ static unsigned int sas_ata_qc_issue(struct ata_queued_cmd *qc)
+ 		task->num_scatter = qc->n_elem;
+ 	} else {
+ 		for_each_sg(qc->sg, sg, qc->n_elem, si)
+-			xfer += sg->length;
++			xfer += sg_dma_len(sg);
+ 
+ 		task->total_xfer_len = xfer;
+ 		task->num_scatter = si;
+diff --git a/drivers/scsi/mpt3sas/mpt3sas_base.h b/drivers/scsi/mpt3sas/mpt3sas_base.h
+index 92648a5ea2d2..63f5965acc89 100644
+--- a/drivers/scsi/mpt3sas/mpt3sas_base.h
++++ b/drivers/scsi/mpt3sas/mpt3sas_base.h
+@@ -390,6 +390,7 @@ struct MPT3SAS_TARGET {
+  * @eedp_enable: eedp support enable bit
+  * @eedp_type: 0(type_1), 1(type_2), 2(type_3)
+  * @eedp_block_length: block size
++ * @ata_command_pending: SATL passthrough outstanding for device
+  */
+ struct MPT3SAS_DEVICE {
+ 	struct MPT3SAS_TARGET *sas_target;
+@@ -398,6 +399,17 @@ struct MPT3SAS_DEVICE {
+ 	u8	configured_lun;
+ 	u8	block;
+ 	u8	tlr_snoop_check;
++	/*
++	 * Bug workaround for SATL handling: the mpt2/3sas firmware
++	 * doesn't return BUSY or TASK_SET_FULL for subsequent
++	 * commands while a SATL pass through is in operation as the
++	 * spec requires, it simply does nothing with them until the
++	 * pass through completes, causing them possibly to timeout if
++	 * the passthrough is a long executing command (like format or
++	 * secure erase).  This variable allows us to do the right
++	 * thing while a SATL command is pending.
++	 */
++	unsigned long ata_command_pending;
+ };
+ 
+ #define MPT3_CMD_NOT_USED	0x8000	/* free */
+diff --git a/drivers/scsi/mpt3sas/mpt3sas_scsih.c b/drivers/scsi/mpt3sas/mpt3sas_scsih.c
+index f6a8e9958e75..8a5fbdb45cfd 100644
+--- a/drivers/scsi/mpt3sas/mpt3sas_scsih.c
++++ b/drivers/scsi/mpt3sas/mpt3sas_scsih.c
+@@ -3707,9 +3707,18 @@ _scsih_temp_threshold_events(struct MPT3SAS_ADAPTER *ioc,
+ 	}
+ }
+ 
+-static inline bool ata_12_16_cmd(struct scsi_cmnd *scmd)
++static int _scsih_set_satl_pending(struct scsi_cmnd *scmd, bool pending)
+ {
+-	return (scmd->cmnd[0] == ATA_12 || scmd->cmnd[0] == ATA_16);
++	struct MPT3SAS_DEVICE *priv = scmd->device->hostdata;
++
++	if (scmd->cmnd[0] != ATA_12 && scmd->cmnd[0] != ATA_16)
++		return 0;
++
++	if (pending)
++		return test_and_set_bit(0, &priv->ata_command_pending);
++
++	clear_bit(0, &priv->ata_command_pending);
++	return 0;
+ }
+ 
+ /**
+@@ -3733,9 +3742,7 @@ _scsih_flush_running_cmds(struct MPT3SAS_ADAPTER *ioc)
+ 		if (!scmd)
+ 			continue;
+ 		count++;
+-		if (ata_12_16_cmd(scmd))
+-			scsi_internal_device_unblock(scmd->device,
+-							SDEV_RUNNING);
++		_scsih_set_satl_pending(scmd, false);
+ 		mpt3sas_base_free_smid(ioc, smid);
+ 		scsi_dma_unmap(scmd);
+ 		if (ioc->pci_error_recovery)
+@@ -3866,13 +3873,6 @@ scsih_qcmd(struct Scsi_Host *shost, struct scsi_cmnd *scmd)
+ 	if (ioc->logging_level & MPT_DEBUG_SCSI)
+ 		scsi_print_command(scmd);
+ 
+-	/*
+-	 * Lock the device for any subsequent command until command is
+-	 * done.
+-	 */
+-	if (ata_12_16_cmd(scmd))
+-		scsi_internal_device_block(scmd->device);
+-
+ 	sas_device_priv_data = scmd->device->hostdata;
+ 	if (!sas_device_priv_data || !sas_device_priv_data->sas_target) {
+ 		scmd->result = DID_NO_CONNECT << 16;
+@@ -3886,6 +3886,19 @@ scsih_qcmd(struct Scsi_Host *shost, struct scsi_cmnd *scmd)
+ 		return 0;
+ 	}
+ 
++	/*
++	 * Bug work around for firmware SATL handling.  The loop
++	 * is based on atomic operations and ensures consistency
++	 * since we're lockless at this point
++	 */
++	do {
++		if (test_bit(0, &sas_device_priv_data->ata_command_pending)) {
++			scmd->result = SAM_STAT_BUSY;
++			scmd->scsi_done(scmd);
++			return 0;
++		}
++	} while (_scsih_set_satl_pending(scmd, true));
++
+ 	sas_target_priv_data = sas_device_priv_data->sas_target;
+ 
+ 	/* invalid device handle */
+@@ -4445,8 +4458,7 @@ _scsih_io_done(struct MPT3SAS_ADAPTER *ioc, u16 smid, u8 msix_index, u32 reply)
+ 	if (scmd == NULL)
+ 		return 1;
+ 
+-	if (ata_12_16_cmd(scmd))
+-		scsi_internal_device_unblock(scmd->device, SDEV_RUNNING);
++	_scsih_set_satl_pending(scmd, false);
+ 
+ 	mpi_request = mpt3sas_base_get_msg_frame(ioc, smid);
+ 
+diff --git a/drivers/scsi/sg.c b/drivers/scsi/sg.c
+index dedcff9cabb5..6514636431ab 100644
+--- a/drivers/scsi/sg.c
++++ b/drivers/scsi/sg.c
+@@ -1008,6 +1008,8 @@ sg_ioctl(struct file *filp, unsigned int cmd_in, unsigned long arg)
+ 		result = get_user(val, ip);
+ 		if (result)
+ 			return result;
++		if (val > SG_MAX_CDB_SIZE)
++			return -ENOMEM;
+ 		sfp->next_cmd_len = (val > 0) ? val : 0;
+ 		return 0;
+ 	case SG_GET_VERSION_NUM:
+diff --git a/drivers/tty/serial/atmel_serial.c b/drivers/tty/serial/atmel_serial.c
+index a0f911641b04..a15070a7fcd6 100644
+--- a/drivers/tty/serial/atmel_serial.c
++++ b/drivers/tty/serial/atmel_serial.c
+@@ -1987,6 +1987,11 @@ static void atmel_flush_buffer(struct uart_port *port)
+ 		atmel_uart_writel(port, ATMEL_PDC_TCR, 0);
+ 		atmel_port->pdc_tx.ofs = 0;
+ 	}
++	/*
++	 * in uart_flush_buffer(), the xmit circular buffer has just
++	 * been cleared, so we have to reset tx_len accordingly.
++	 */
++	atmel_port->tx_len = 0;
+ }
+ 
+ /*
+@@ -2499,6 +2504,9 @@ static void atmel_console_write(struct console *co, const char *s, u_int count)
+ 	pdc_tx = atmel_uart_readl(port, ATMEL_PDC_PTSR) & ATMEL_PDC_TXTEN;
+ 	atmel_uart_writel(port, ATMEL_PDC_PTCR, ATMEL_PDC_TXTDIS);
+ 
++	/* Make sure that tx path is actually able to send characters */
++	atmel_uart_writel(port, ATMEL_US_CR, ATMEL_US_TXEN);
++
+ 	uart_console_write(port, s, count, atmel_console_putchar);
+ 
+ 	/*
+diff --git a/drivers/usb/core/hcd.c b/drivers/usb/core/hcd.c
+index 5724d7c41e29..ca2cbdb3aa67 100644
+--- a/drivers/usb/core/hcd.c
++++ b/drivers/usb/core/hcd.c
+@@ -499,8 +499,10 @@ static int rh_call_control (struct usb_hcd *hcd, struct urb *urb)
+ 	 */
+ 	tbuf_size =  max_t(u16, sizeof(struct usb_hub_descriptor), wLength);
+ 	tbuf = kzalloc(tbuf_size, GFP_KERNEL);
+-	if (!tbuf)
+-		return -ENOMEM;
++	if (!tbuf) {
++		status = -ENOMEM;
++		goto err_alloc;
++	}
+ 
+ 	bufp = tbuf;
+ 
+@@ -705,6 +707,7 @@ error:
+ 	}
+ 
+ 	kfree(tbuf);
++ err_alloc:
+ 
+ 	/* any errors get returned through the urb completion */
+ 	spin_lock_irq(&hcd_root_hub_lock);
+diff --git a/include/linux/kvm_host.h b/include/linux/kvm_host.h
+index c923350ca20a..d7ce4e3280db 100644
+--- a/include/linux/kvm_host.h
++++ b/include/linux/kvm_host.h
+@@ -182,8 +182,8 @@ int kvm_io_bus_read(struct kvm_vcpu *vcpu, enum kvm_bus bus_idx, gpa_t addr,
+ 		    int len, void *val);
+ int kvm_io_bus_register_dev(struct kvm *kvm, enum kvm_bus bus_idx, gpa_t addr,
+ 			    int len, struct kvm_io_device *dev);
+-int kvm_io_bus_unregister_dev(struct kvm *kvm, enum kvm_bus bus_idx,
+-			      struct kvm_io_device *dev);
++void kvm_io_bus_unregister_dev(struct kvm *kvm, enum kvm_bus bus_idx,
++			       struct kvm_io_device *dev);
+ 
+ #ifdef CONFIG_KVM_ASYNC_PF
+ struct kvm_async_pf {
+diff --git a/kernel/padata.c b/kernel/padata.c
+index b38bea9c466a..401227e3967c 100644
+--- a/kernel/padata.c
++++ b/kernel/padata.c
+@@ -189,19 +189,20 @@ static struct padata_priv *padata_get_next(struct parallel_data *pd)
+ 
+ 	reorder = &next_queue->reorder;
+ 
++	spin_lock(&reorder->lock);
+ 	if (!list_empty(&reorder->list)) {
+ 		padata = list_entry(reorder->list.next,
+ 				    struct padata_priv, list);
+ 
+-		spin_lock(&reorder->lock);
+ 		list_del_init(&padata->list);
+ 		atomic_dec(&pd->reorder_objects);
+-		spin_unlock(&reorder->lock);
+ 
+ 		pd->processed++;
+ 
++		spin_unlock(&reorder->lock);
+ 		goto out;
+ 	}
++	spin_unlock(&reorder->lock);
+ 
+ 	if (__this_cpu_read(pd->pqueue->cpu_index) == next_queue->cpu_index) {
+ 		padata = ERR_PTR(-ENODATA);
+diff --git a/mm/hugetlb.c b/mm/hugetlb.c
+index ea11123a9249..7294301d8495 100644
+--- a/mm/hugetlb.c
++++ b/mm/hugetlb.c
+@@ -4362,6 +4362,7 @@ follow_huge_pmd(struct mm_struct *mm, unsigned long address,
+ {
+ 	struct page *page = NULL;
+ 	spinlock_t *ptl;
++	pte_t pte;
+ retry:
+ 	ptl = pmd_lockptr(mm, pmd);
+ 	spin_lock(ptl);
+@@ -4371,12 +4372,13 @@ retry:
+ 	 */
+ 	if (!pmd_huge(*pmd))
+ 		goto out;
+-	if (pmd_present(*pmd)) {
++	pte = huge_ptep_get((pte_t *)pmd);
++	if (pte_present(pte)) {
+ 		page = pmd_page(*pmd) + ((address & ~PMD_MASK) >> PAGE_SHIFT);
+ 		if (flags & FOLL_GET)
+ 			get_page(page);
+ 	} else {
+-		if (is_hugetlb_entry_migration(huge_ptep_get((pte_t *)pmd))) {
++		if (is_hugetlb_entry_migration(pte)) {
+ 			spin_unlock(ptl);
+ 			__migration_entry_wait(mm, (pte_t *)pmd, ptl);
+ 			goto retry;
+diff --git a/net/ceph/messenger.c b/net/ceph/messenger.c
+index b8d927c56494..a6b2f2138c9d 100644
+--- a/net/ceph/messenger.c
++++ b/net/ceph/messenger.c
+@@ -7,6 +7,7 @@
+ #include <linux/kthread.h>
+ #include <linux/net.h>
+ #include <linux/nsproxy.h>
++#include <linux/sched.h>
+ #include <linux/slab.h>
+ #include <linux/socket.h>
+ #include <linux/string.h>
+@@ -478,11 +479,16 @@ static int ceph_tcp_connect(struct ceph_connection *con)
+ {
+ 	struct sockaddr_storage *paddr = &con->peer_addr.in_addr;
+ 	struct socket *sock;
++	unsigned int noio_flag;
+ 	int ret;
+ 
+ 	BUG_ON(con->sock);
++
++	/* sock_create_kern() allocates with GFP_KERNEL */
++	noio_flag = memalloc_noio_save();
+ 	ret = sock_create_kern(read_pnet(&con->msgr->net), paddr->ss_family,
+ 			       SOCK_STREAM, IPPROTO_TCP, &sock);
++	memalloc_noio_restore(noio_flag);
+ 	if (ret)
+ 		return ret;
+ 	sock->sk->sk_allocation = GFP_NOFS;
+diff --git a/sound/core/seq/seq_fifo.c b/sound/core/seq/seq_fifo.c
+index 3f4efcb85df5..3490d21ab9e7 100644
+--- a/sound/core/seq/seq_fifo.c
++++ b/sound/core/seq/seq_fifo.c
+@@ -265,6 +265,10 @@ int snd_seq_fifo_resize(struct snd_seq_fifo *f, int poolsize)
+ 	/* NOTE: overflow flag is not cleared */
+ 	spin_unlock_irqrestore(&f->lock, flags);
+ 
++	/* close the old pool and wait until all users are gone */
++	snd_seq_pool_mark_closing(oldpool);
++	snd_use_lock_sync(&f->use_lock);
++
+ 	/* release cells in old pool */
+ 	for (cell = oldhead; cell; cell = next) {
+ 		next = cell->next;
+diff --git a/sound/pci/hda/patch_realtek.c b/sound/pci/hda/patch_realtek.c
+index 1d4f34379f56..46a34039ecdc 100644
+--- a/sound/pci/hda/patch_realtek.c
++++ b/sound/pci/hda/patch_realtek.c
+@@ -4831,6 +4831,7 @@ enum {
+ 	ALC292_FIXUP_DISABLE_AAMIX,
+ 	ALC293_FIXUP_DISABLE_AAMIX_MULTIJACK,
+ 	ALC298_FIXUP_DELL1_MIC_NO_PRESENCE,
++	ALC298_FIXUP_DELL_AIO_MIC_NO_PRESENCE,
+ 	ALC275_FIXUP_DELL_XPS,
+ 	ALC256_FIXUP_DELL_XPS_13_HEADPHONE_NOISE,
+ 	ALC293_FIXUP_LENOVO_SPK_NOISE,
+@@ -5429,6 +5430,15 @@ static const struct hda_fixup alc269_fixups[] = {
+ 		.chained = true,
+ 		.chain_id = ALC269_FIXUP_HEADSET_MODE
+ 	},
++	[ALC298_FIXUP_DELL_AIO_MIC_NO_PRESENCE] = {
++		.type = HDA_FIXUP_PINS,
++		.v.pins = (const struct hda_pintbl[]) {
++			{ 0x18, 0x01a1913c }, /* use as headset mic, without its own jack detect */
++			{ }
++		},
++		.chained = true,
++		.chain_id = ALC269_FIXUP_HEADSET_MODE
++	},
+ 	[ALC275_FIXUP_DELL_XPS] = {
+ 		.type = HDA_FIXUP_VERBS,
+ 		.v.verbs = (const struct hda_verb[]) {
+@@ -5501,7 +5511,7 @@ static const struct hda_fixup alc269_fixups[] = {
+ 		.type = HDA_FIXUP_FUNC,
+ 		.v.func = alc298_fixup_speaker_volume,
+ 		.chained = true,
+-		.chain_id = ALC298_FIXUP_DELL1_MIC_NO_PRESENCE,
++		.chain_id = ALC298_FIXUP_DELL_AIO_MIC_NO_PRESENCE,
+ 	},
+ 	[ALC256_FIXUP_DELL_INSPIRON_7559_SUBWOOFER] = {
+ 		.type = HDA_FIXUP_PINS,
+diff --git a/sound/soc/atmel/atmel-classd.c b/sound/soc/atmel/atmel-classd.c
+index 8276675730ef..78a985629607 100644
+--- a/sound/soc/atmel/atmel-classd.c
++++ b/sound/soc/atmel/atmel-classd.c
+@@ -343,7 +343,7 @@ static int atmel_classd_codec_dai_digital_mute(struct snd_soc_dai *codec_dai,
+ }
+ 
+ #define CLASSD_ACLK_RATE_11M2896_MPY_8 (112896 * 100 * 8)
+-#define CLASSD_ACLK_RATE_12M288_MPY_8  (12228 * 1000 * 8)
++#define CLASSD_ACLK_RATE_12M288_MPY_8  (12288 * 1000 * 8)
+ 
+ static struct {
+ 	int rate;
+diff --git a/virt/kvm/eventfd.c b/virt/kvm/eventfd.c
+index 46dbc0a7dfc1..49001fa84ead 100644
+--- a/virt/kvm/eventfd.c
++++ b/virt/kvm/eventfd.c
+@@ -868,7 +868,8 @@ kvm_deassign_ioeventfd_idx(struct kvm *kvm, enum kvm_bus bus_idx,
+ 			continue;
+ 
+ 		kvm_io_bus_unregister_dev(kvm, bus_idx, &p->dev);
+-		kvm->buses[bus_idx]->ioeventfd_count--;
++		if (kvm->buses[bus_idx])
++			kvm->buses[bus_idx]->ioeventfd_count--;
+ 		ioeventfd_release(p);
+ 		ret = 0;
+ 		break;
+diff --git a/virt/kvm/kvm_main.c b/virt/kvm/kvm_main.c
+index 336ed267c407..cb092bd9965b 100644
+--- a/virt/kvm/kvm_main.c
++++ b/virt/kvm/kvm_main.c
+@@ -654,8 +654,11 @@ static void kvm_destroy_vm(struct kvm *kvm)
+ 	list_del(&kvm->vm_list);
+ 	spin_unlock(&kvm_lock);
+ 	kvm_free_irq_routing(kvm);
+-	for (i = 0; i < KVM_NR_BUSES; i++)
+-		kvm_io_bus_destroy(kvm->buses[i]);
++	for (i = 0; i < KVM_NR_BUSES; i++) {
++		if (kvm->buses[i])
++			kvm_io_bus_destroy(kvm->buses[i]);
++		kvm->buses[i] = NULL;
++	}
+ 	kvm_coalesced_mmio_free(kvm);
+ #if defined(CONFIG_MMU_NOTIFIER) && defined(KVM_ARCH_WANT_MMU_NOTIFIER)
+ 	mmu_notifier_unregister(&kvm->mmu_notifier, kvm->mm);
+@@ -3271,6 +3274,8 @@ int kvm_io_bus_write(struct kvm_vcpu *vcpu, enum kvm_bus bus_idx, gpa_t addr,
+ 	};
+ 
+ 	bus = srcu_dereference(vcpu->kvm->buses[bus_idx], &vcpu->kvm->srcu);
++	if (!bus)
++		return -ENOMEM;
+ 	r = __kvm_io_bus_write(vcpu, bus, &range, val);
+ 	return r < 0 ? r : 0;
+ }
+@@ -3288,6 +3293,8 @@ int kvm_io_bus_write_cookie(struct kvm_vcpu *vcpu, enum kvm_bus bus_idx,
+ 	};
+ 
+ 	bus = srcu_dereference(vcpu->kvm->buses[bus_idx], &vcpu->kvm->srcu);
++	if (!bus)
++		return -ENOMEM;
+ 
+ 	/* First try the device referenced by cookie. */
+ 	if ((cookie >= 0) && (cookie < bus->dev_count) &&
+@@ -3338,6 +3345,8 @@ int kvm_io_bus_read(struct kvm_vcpu *vcpu, enum kvm_bus bus_idx, gpa_t addr,
+ 	};
+ 
+ 	bus = srcu_dereference(vcpu->kvm->buses[bus_idx], &vcpu->kvm->srcu);
++	if (!bus)
++		return -ENOMEM;
+ 	r = __kvm_io_bus_read(vcpu, bus, &range, val);
+ 	return r < 0 ? r : 0;
+ }
+@@ -3350,6 +3359,9 @@ int kvm_io_bus_register_dev(struct kvm *kvm, enum kvm_bus bus_idx, gpa_t addr,
+ 	struct kvm_io_bus *new_bus, *bus;
+ 
+ 	bus = kvm->buses[bus_idx];
++	if (!bus)
++		return -ENOMEM;
++
+ 	/* exclude ioeventfd which is limited by maximum fd */
+ 	if (bus->dev_count - bus->ioeventfd_count > NR_IOBUS_DEVS - 1)
+ 		return -ENOSPC;
+@@ -3369,37 +3381,41 @@ int kvm_io_bus_register_dev(struct kvm *kvm, enum kvm_bus bus_idx, gpa_t addr,
+ }
+ 
+ /* Caller must hold slots_lock. */
+-int kvm_io_bus_unregister_dev(struct kvm *kvm, enum kvm_bus bus_idx,
+-			      struct kvm_io_device *dev)
++void kvm_io_bus_unregister_dev(struct kvm *kvm, enum kvm_bus bus_idx,
++			       struct kvm_io_device *dev)
+ {
+-	int i, r;
++	int i;
+ 	struct kvm_io_bus *new_bus, *bus;
+ 
+ 	bus = kvm->buses[bus_idx];
+-	r = -ENOENT;
++	if (!bus)
++		return;
++
+ 	for (i = 0; i < bus->dev_count; i++)
+ 		if (bus->range[i].dev == dev) {
+-			r = 0;
+ 			break;
+ 		}
+ 
+-	if (r)
+-		return r;
++	if (i == bus->dev_count)
++		return;
+ 
+ 	new_bus = kmalloc(sizeof(*bus) + ((bus->dev_count - 1) *
+ 			  sizeof(struct kvm_io_range)), GFP_KERNEL);
+-	if (!new_bus)
+-		return -ENOMEM;
++	if (!new_bus)  {
++		pr_err("kvm: failed to shrink bus, removing it completely\n");
++		goto broken;
++	}
+ 
+ 	memcpy(new_bus, bus, sizeof(*bus) + i * sizeof(struct kvm_io_range));
+ 	new_bus->dev_count--;
+ 	memcpy(new_bus->range + i, bus->range + i + 1,
+ 	       (new_bus->dev_count - i) * sizeof(struct kvm_io_range));
+ 
++broken:
+ 	rcu_assign_pointer(kvm->buses[bus_idx], new_bus);
+ 	synchronize_srcu_expedited(&kvm->srcu);
+ 	kfree(bus);
+-	return r;
++	return;
+ }
+ 
+ static struct notifier_block kvm_cpu_notifier = {