tree 0c4953ff478f9a93ea337e637b5ede612830dd8d
parent 5f5ad9ced33621d353be6429c3900f8a526fcae8
author Jens Axboe <axboe@kernel.dk> 1568827103 -0600
committer Jens Axboe <axboe@kernel.dk> 1568827166 -0600

io_uring: ensure poll commands clear ->sqe

If we end up getting woken in poll (due to a signal), then we may need
to punt the poll request to an async worker. When we do that, we look up
the list to queue at, deferefencing req->submit.sqe, however that is
only set for requests we initially decided to queue async.

This fixes a crash with poll command usage and wakeups that need to punt
to async context.

Fixes: 54a91f3bb9b9 ("io_uring: limit parallelism of buffered writes")
Signed-off-by: Jens Axboe <axboe@kernel.dk>