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| author | Kent Overstreet <kent.overstreet@gmail.com> | 2019-09-03 15:25:45 +0200 |
|---|---|---|
| committer | Jens Axboe <axboe@kernel.dk> | 2019-09-03 16:08:31 +0200 |
| commit | a22a9602b88fabf10847f238ff81fde5f906fef7 (patch) | |
| tree | cdda0a4f2abcfaf8627fec61a16de34e19a2223b /drivers/md/raid0.c | |
| parent | bcache: Fix an error code in bch_dump_read() (diff) | |
| download | linux-a22a9602b88fabf10847f238ff81fde5f906fef7.tar.xz linux-a22a9602b88fabf10847f238ff81fde5f906fef7.zip | |
closures: fix a race on wakeup from closure_sync
The race was when a thread using closure_sync() notices cl->s->done == 1
before the thread calling closure_put() calls wake_up_process(). Then,
it's possible for that thread to return and exit just before
wake_up_process() is called - so we're trying to wake up a process that
no longer exists.
rcu_read_lock() is sufficient to protect against this, as there's an rcu
barrier somewhere in the process teardown path.
Signed-off-by: Kent Overstreet <kent.overstreet@gmail.com>
Acked-by: Coly Li <colyli@suse.de>
Signed-off-by: Jens Axboe <axboe@kernel.dk>
Diffstat (limited to 'drivers/md/raid0.c')
0 files changed, 0 insertions, 0 deletions