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| author | Borislav Petkov <bp@alien8.de> | 2011-10-03 14:28:18 -0400 |
|---|---|---|
| committer | Greg Kroah-Hartman <gregkh@suse.de> | 2011-10-16 14:14:51 -0700 |
| commit | 3217df8e225c8579293fd2e193ba5cee709b6eba (patch) | |
| tree | fc527832020b5648dead7aada6cdd16e35229775 /kernel/profile.c | |
| parent | 4e41ce698822a9a2cfd324a11ea44f60fc95c871 (diff) | |
| download | lwn-3217df8e225c8579293fd2e193ba5cee709b6eba.tar.gz lwn-3217df8e225c8579293fd2e193ba5cee709b6eba.zip | |
ide-disk: Fix request requeuing
commit 2c8fc867602e385fd2abe76da0b6bda8ed907547 upstream.
Simon Kirby reported that on his RAID setup with idedisk underneath
the box OOMs after a couple of days of runtime. Running with
CONFIG_DEBUG_KMEMLEAK pointed to idedisk_prep_fn() which unconditionally
allocates an ide_cmd struct. However, ide_requeue_and_plug() can be
called more than once per request, either from the request issue or the
IRQ handler path and do blk_peek_request() ends up in idedisk_prep_fn()
repeatedly, allocating a struct ide_cmd everytime and "forgetting" the
previous pointer.
Make sure the code reuses the old allocated chunk.
Reported-and-tested-by: Simon Kirby <sim@hostway.ca>
Link: http://marc.info/?l=linux-kernel&m=131667641517919
Link: http://lkml.kernel.org/r/20110922072643.GA27232@hostway.ca
Signed-off-by: Borislav Petkov <bp@alien8.de>
Signed-off-by: David S. Miller <davem@davemloft.net>
Signed-off-by: Greg Kroah-Hartman <gregkh@suse.de>
Diffstat (limited to 'kernel/profile.c')
0 files changed, 0 insertions, 0 deletions