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| author | Jens Axboe <axboe@kernel.dk> | 2012-11-06 12:24:26 +0100 |
|---|---|---|
| committer | Greg Kroah-Hartman <gregkh@linuxfoundation.org> | 2012-12-03 11:47:07 -0800 |
| commit | f42513b9fd98a0f3afa8fe9bc23700b4226e1f6f (patch) | |
| tree | 5176c37db1f8520cab12fe122cb46c3045d20d47 /block | |
| parent | ecf049ce86e1d93bc9a3376facf31d7244338089 (diff) | |
| download | lwn-f42513b9fd98a0f3afa8fe9bc23700b4226e1f6f.tar.gz lwn-f42513b9fd98a0f3afa8fe9bc23700b4226e1f6f.zip | |
dm: fix deadlock with request based dm and queue request_fn recursion
commit a8c32a5c98943d370ea606a2e7dc04717eb92206 upstream.
Request based dm attempts to re-run the request queue off the
request completion path. If used with a driver that potentially does
end_io from its request_fn, we could deadlock trying to recurse
back into request dispatch. Fix this by punting the request queue
run to kblockd.
Tested to fix a quickly reproducible deadlock in such a scenario.
Acked-by: Alasdair G Kergon <agk@redhat.com>
Signed-off-by: Jens Axboe <axboe@kernel.dk>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
Diffstat (limited to 'block')
0 files changed, 0 insertions, 0 deletions