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| author | Roland Dreier <roland@purestorage.com> | 2012-11-22 02:00:11 -0800 |
|---|---|---|
| committer | Jens Axboe <axboe@kernel.dk> | 2012-11-23 14:32:55 +0100 |
| commit | 893d290f1d7496db97c9471bc352ad4a11dc8a25 (patch) | |
| tree | c6d5444d06949edfd5d13fa0beed0992dd2ae469 /samples/trace_events | |
| parent | 836413e8c78ecbc55aa31f3cb600f8ee1aa355a2 (diff) | |
| download | blackbird-op-linux-893d290f1d7496db97c9471bc352ad4a11dc8a25.tar.gz blackbird-op-linux-893d290f1d7496db97c9471bc352ad4a11dc8a25.zip | |
block: Don't access request after it might be freed
After we've done __elv_add_request() and __blk_run_queue() in
blk_execute_rq_nowait(), the request might finish and be freed
immediately. Therefore checking if the type is REQ_TYPE_PM_RESUME
isn't safe afterwards, because if it isn't, rq might be gone.
Instead, check beforehand and stash the result in a temporary.
This fixes crashes in blk_execute_rq_nowait() I get occasionally when
running with lots of memory debugging options enabled -- I think this
race is usually harmless because the window for rq to be reallocated
is so small.
Signed-off-by: Roland Dreier <roland@purestorage.com>
Cc: stable@kernel.org
Signed-off-by: Jens Axboe <axboe@kernel.dk>
Diffstat (limited to 'samples/trace_events')
0 files changed, 0 insertions, 0 deletions
