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io_uring: hold uring mutex around poll removal 

Snipped from commit 9ca9fb24d5 upstream.

While reworking the poll hashing in the v6.0 kernel, we ended up
grabbing the ctx->uring_lock in poll update/removal. This also fixed
a bug with linked timeouts racing with timeout expiry and poll
removal.

Bring back just the locking fix for that.

Reported-and-tested-by: Querijn Voet <querijnqyn@gmail.com>
Signed-off-by: Jens Axboe <axboe@kernel.dk>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
This commit is contained in:
Jens Axboe 2023-06-16 21:12:06 -06:00 committed by Greg Kroah-Hartman
parent 27825a6da7
commit 0e388fce7a
1 changed files with 3 additions and 0 deletions
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3
io_uring/io_uring.c
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@ -6111,6 +6111,8 @@ static int io_poll_update(struct io_kiocb *req, unsigned int issue_flags)
struct io_kiocb *preq;
int ret2, ret = 0;
io_ring_submit_lock(ctx, !(issue_flags & IO_URING_F_NONBLOCK));
spin_lock(&ctx->completion_lock);
preq = io_poll_find(ctx, req->poll_update.old_user_data, true);
if (!preq || !io_poll_disarm(preq)) {
@ -6142,6 +6144,7 @@ out:
req_set_fail(req);
/* complete update request, we're done with it */
io_req_complete(req, ret);
io_ring_submit_unlock(ctx, !(issue_flags & IO_URING_F_NONBLOCK));
return 0;
}