Merge android-4.4.140 (789274d) into msm-4.4

* refs/heads/tmp-789274d
  Linux 4.4.140
  staging: comedi: quatech_daqp_cs: fix no-op loop daqp_ao_insn_write()
  netfilter: nf_log: don't hold nf_log_mutex during user access
  mtd: cfi_cmdset_0002: Change erase functions to check chip good only
  mtd: cfi_cmdset_0002: Change erase functions to retry for error
  mtd: cfi_cmdset_0002: Change definition naming to retry write operation
  dm bufio: don't take the lock in dm_bufio_shrink_count
  mtd: rawnand: mxc: set spare area size register explicitly
  dm bufio: drop the lock when doing GFP_NOIO allocation
  dm bufio: avoid sleeping while holding the dm_bufio lock
  mm, page_alloc: do not break __GFP_THISNODE by zonelist reset
  media: cx25840: Use subdev host data for PLL override
  x86/mce: Fix incorrect "Machine check from unknown source" message
  x86/mce: Detect local MCEs properly
  HID: debug: check length before copy_to_user()
  HID: hiddev: fix potential Spectre v1
  HID: i2c-hid: Fix "incomplete report" noise
  ext4: check superblock mapped prior to committing
  ext4: add more mount time checks of the superblock
  ext4: add more inode number paranoia checks
  ext4: clear i_data in ext4_inode_info when removing inline data
  ext4: include the illegal physical block in the bad map ext4_error msg
  ext4: verify the depth of extent tree in ext4_find_extent()
  ext4: only look at the bg_flags field if it is valid
  ext4: always check block group bounds in ext4_init_block_bitmap()
  ext4: make sure bitmaps and the inode table don't overlap with bg descriptors
  jbd2: don't mark block as modified if the handle is out of credits
  cifs: Fix infinite loop when using hard mount option
  drbd: fix access after free
  s390: Correct register corruption in critical section cleanup
  scsi: sg: mitigate read/write abuse
  tracing: Fix missing return symbol in function_graph output
  mm: hugetlb: yield when prepping struct pages
  ubi: fastmap: Correctly handle interrupted erasures in EBA
  ARM: dts: imx6q: Use correct SDMA script for SPI5 core
  netfilter: nf_tables: use WARN_ON_ONCE instead of BUG_ON in nft_do_chain()
  nvme-pci: initialize queue memory before interrupts
  kprobes/x86: Do not modify singlestep buffer while resuming
  ipv4: Fix error return value in fib_convert_metrics()
  i2c: rcar: fix resume by always initializing registers before transfer
  ath10k: fix rfc1042 header retrieval in QCA4019 with eth decap mode
  x86/boot: Fix early command-line parsing when matching at end
  n_tty: Access echo_* variables carefully.
  staging: android: ion: Return an ERR_PTR in ion_map_kernel
  n_tty: Fix stall at n_tty_receive_char_special().
  USB: serial: cp210x: add Silicon Labs IDs for Windows Update
  USB: serial: cp210x: add CESINEL device ids
  usb: cdc_acm: Add quirk for Uniden UBC125 scanner

Change-Id: I01c4fc4b6354c28a7d8ff391ff515096ed4d3da4
Signed-off-by: Blagovest Kolenichev <bkolenichev@codeaurora.org>
Signed-off-by: Srinivasarao P <spathi@codeaurora.org>

1 files changed, 14 insertions, 12 deletions

diff --git a/drivers/md/dm-bufio.c b/drivers/md/dm-bufio.c
index d566c32e222a..b1d5fa0bc8f7 100644
--- a/drivers/md/dm-bufio.c
+++ b/drivers/md/dm-bufio.c
@@ -813,6 +813,7 @@ enum new_flag {
 static struct dm_buffer *__alloc_buffer_wait_no_callback(struct dm_bufio_client *c, enum new_flag nf)
 {
 	struct dm_buffer *b;
+	bool tried_noio_alloc = false;
 
 	/*
 	 * dm-bufio is resistant to allocation failures (it just keeps
@@ -837,6 +838,15 @@ static struct dm_buffer *__alloc_buffer_wait_no_callback(struct dm_bufio_client
 		if (nf == NF_PREFETCH)
 			return NULL;
 
+		if (dm_bufio_cache_size_latch != 1 && !tried_noio_alloc) {
+			dm_bufio_unlock(c);
+			b = alloc_buffer(c, GFP_NOIO | __GFP_NORETRY | __GFP_NOMEMALLOC | __GFP_NOWARN);
+			dm_bufio_lock(c);
+			if (b)
+				return b;
+			tried_noio_alloc = true;
+		}
+
 		if (!list_empty(&c->reserved_buffers)) {
 			b = list_entry(c->reserved_buffers.next,
 				       struct dm_buffer, lru_list);
@@ -1564,19 +1574,11 @@ dm_bufio_shrink_scan(struct shrinker *shrink, struct shrink_control *sc)
 static unsigned long
 dm_bufio_shrink_count(struct shrinker *shrink, struct shrink_control *sc)
 {
-	struct dm_bufio_client *c;
-	unsigned long count;
-	unsigned long retain_target;
-
-	c = container_of(shrink, struct dm_bufio_client, shrinker);
-	if (sc->gfp_mask & __GFP_FS)
-		dm_bufio_lock(c);
-	else if (!dm_bufio_trylock(c))
-		return 0;
+	struct dm_bufio_client *c = container_of(shrink, struct dm_bufio_client, shrinker);
+	unsigned long count = READ_ONCE(c->n_buffers[LIST_CLEAN]) +
+			      READ_ONCE(c->n_buffers[LIST_DIRTY]);
+	unsigned long retain_target = get_retain_buffers(c);
 
-	count = c->n_buffers[LIST_CLEAN] + c->n_buffers[LIST_DIRTY];
-	retain_target = get_retain_buffers(c);
-	dm_bufio_unlock(c);
 	return (count < retain_target) ? 0 : (count - retain_target);
 }