Merge 4.4.201 into android-4.4-p

Changes in 4.4.201
	CDC-NCM: handle incomplete transfer of MTU
	net: fix data-race in neigh_event_send()
	NFC: fdp: fix incorrect free object
	NFC: st21nfca: fix double free
	qede: fix NULL pointer deref in __qede_remove()
	nfc: netlink: fix double device reference drop
	ALSA: bebob: fix to detect configured source of sampling clock for Focusrite Saffire Pro i/o series
	ALSA: hda/ca0132 - Fix possible workqueue stall
	mm, vmstat: hide /proc/pagetypeinfo from normal users
	dump_stack: avoid the livelock of the dump_lock
	perf tools: Fix time sorting
	drm/radeon: fix si_enable_smc_cac() failed issue
	ceph: fix use-after-free in __ceph_remove_cap()
	iio: imu: adis16480: make sure provided frequency is positive
	netfilter: nf_tables: Align nft_expr private data to 64-bit
	netfilter: ipset: Fix an error code in ip_set_sockfn_get()
	can: usb_8dev: fix use-after-free on disconnect
	can: c_can: c_can_poll(): only read status register after status IRQ
	can: peak_usb: fix a potential out-of-sync while decoding packets
	can: gs_usb: gs_can_open(): prevent memory leak
	can: peak_usb: fix slab info leak
	drivers: usb: usbip: Add missing break statement to switch
	configfs: fix a deadlock in configfs_symlink()
	PCI: tegra: Enable Relaxed Ordering only for Tegra20 & Tegra30
	scsi: qla2xxx: fixup incorrect usage of host_byte
	scsi: lpfc: Honor module parameter lpfc_use_adisc
	ipvs: move old_secure_tcp into struct netns_ipvs
	bonding: fix unexpected IFF_BONDING bit unset
	usb: fsl: Check memory resource before releasing it
	usb: gadget: udc: atmel: Fix interrupt storm in FIFO mode.
	usb: gadget: composite: Fix possible double free memory bug
	usb: gadget: configfs: fix concurrent issue between composite APIs
	perf/x86/amd/ibs: Fix reading of the IBS OpData register and thus precise RIP validity
	USB: Skip endpoints with 0 maxpacket length
	scsi: qla2xxx: stop timer in shutdown path
	net: hisilicon: Fix "Trying to free already-free IRQ"
	NFSv4: Don't allow a cached open with a revoked delegation
	igb: Fix constant media auto sense switching when no cable is connected
	e1000: fix memory leaks
	can: flexcan: disable completely the ECC mechanism
	mm/filemap.c: don't initiate writeback if mapping has no dirty pages
	cgroup,writeback: don't switch wbs immediately on dead wbs if the memcg is dead
	net: prevent load/store tearing on sk->sk_stamp
	drm/i915/gtt: Add read only pages to gen8_pte_encode
	drm/i915/gtt: Read-only pages for insert_entries on bdw+
	drm/i915/gtt: Disable read-only support under GVT
	drm/i915: Rename gen7 cmdparser tables
	drm/i915: Disable Secure Batches for gen6+
	drm/i915: Remove Master tables from cmdparser
	drm/i915: Add support for mandatory cmdparsing
	drm/i915: Support ro ppgtt mapped cmdparser shadow buffers
	drm/i915: Allow parsing of unsized batches
	drm/i915: Add gen9 BCS cmdparsing
	drm/i915/cmdparser: Add support for backward jumps
	drm/i915/cmdparser: Ignore Length operands during command matching
	drm/i915: Lower RM timeout to avoid DSI hard hangs
	drm/i915/gen8+: Add RC6 CTX corruption WA
	drm/i915/cmdparser: Fix jump whitelist clearing
	Linux 4.4.201

Change-Id: Ifc1fa5b9734f244745b862c6dbf7e34b73245806
Signed-off-by: Greg Kroah-Hartman <gregkh@google.com>

1 files changed, 6 insertions, 1 deletions

diff --git a/lib/dump_stack.c b/lib/dump_stack.c
index c30d07e99dba..72de6444934d 100644
--- a/lib/dump_stack.c
+++ b/lib/dump_stack.c
@@ -44,7 +44,12 @@ retry:
 		was_locked = 1;
 	} else {
 		local_irq_restore(flags);
-		cpu_relax();
+		/*
+		 * Wait for the lock to release before jumping to
+		 * atomic_cmpxchg() in order to mitigate the thundering herd
+		 * problem.
+		 */
+		do { cpu_relax(); } while (atomic_read(&dump_lock) != -1);
 		goto retry;
 	}