[PATCH 5.4 10/16] io_uring: always grab lock in io_cancel_async_work()

From: Jens Axboe axboe@kernel.dk

No upstream commit exists for this patch.

It's not necessarily safe to check the task_list locklessly, remove this micro optimization and always grab task_lock before deeming it empty.

Reported-and-tested-by: Lee Jones lee@kernel.org Signed-off-by: Jens Axboe axboe@kernel.dk Signed-off-by: Greg Kroah-Hartman gregkh@linuxfoundation.org --- fs/io_uring.c | 3 --- 1 file changed, 3 deletions(-)

--- a/fs/io_uring.c +++ b/fs/io_uring.c @@ -3738,9 +3738,6 @@ static void io_cancel_async_work(struct { struct io_kiocb *req;

- if (list_empty(&ctx->task_list)) - return; - spin_lock_irq(&ctx->task_lock);

list_for_each_entry(req, &ctx->task_list, task_list) {