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authorGlauber Costa <glommer@parallels.com>2012-04-25 16:01:48 -0700
committerLinus Torvalds <torvalds@linux-foundation.org>2012-04-25 21:26:33 -0700
commit61065a30af8df4b8989c2ac7a1f4b4034e4df2d5 (patch)
tree3b446b3d81e996ce15901a57e85bab10fcbd8899 /fs
parent904249aa68010c8e223263c922fcbb840a3f42e4 (diff)
downloadlinux-linaro-stable-61065a30af8df4b8989c2ac7a1f4b4034e4df2d5.tar.gz
fs/buffer.c: remove BUG() in possible but rare condition
While stressing the kernel with with failing allocations today, I hit the following chain of events: alloc_page_buffers(): bh = alloc_buffer_head(GFP_NOFS); if (!bh) goto no_grow; <= path taken grow_dev_page(): bh = alloc_page_buffers(page, size, 0); if (!bh) goto failed; <= taken, consequence of the above and then the failed path BUG()s the kernel. The failure is inserted a litte bit artificially, but even then, I see no reason why it should be deemed impossible in a real box. Even though this is not a condition that we expect to see around every time, failed allocations are expected to be handled, and BUG() sounds just too much. As a matter of fact, grow_dev_page() can return NULL just fine in other circumstances, so I propose we just remove it, then. Signed-off-by: Glauber Costa <glommer@parallels.com> Cc: Michal Hocko <mhocko@suse.cz> Signed-off-by: Andrew Morton <akpm@linux-foundation.org> Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
Diffstat (limited to 'fs')
-rw-r--r--fs/buffer.c1
1 files changed, 0 insertions, 1 deletions
diff --git a/fs/buffer.c b/fs/buffer.c
index 36d66653b931..351e18ea2e53 100644
--- a/fs/buffer.c
+++ b/fs/buffer.c
@@ -985,7 +985,6 @@ grow_dev_page(struct block_device *bdev, sector_t block,
return page;
failed:
- BUG();
unlock_page(page);
page_cache_release(page);
return NULL;