From a1bb3cd58913338e1b627ea6b8c03c2ae82d293f Mon Sep 17 00:00:00 2001 From: Pavel Begunkov <asml.silence@gmail.com> Date: Tue, 26 Jan 2021 15:28:26 +0000 Subject: [PATCH] io_uring: fix __io_uring_files_cancel() with TASK_UNINTERRUPTIBLE If the tctx inflight number haven't changed because of cancellation, __io_uring_task_cancel() will continue leaving the task in TASK_UNINTERRUPTIBLE state, that's not expected by __io_uring_files_cancel(). Ensure we always call finish_wait() before retrying. Cc: stable@vger.kernel.org # 5.9+ Signed-off-by: Pavel Begunkov <asml.silence@gmail.com> Signed-off-by: Jens Axboe <axboe@kernel.dk> --- fs/io_uring.c | 11 +++++------ 1 file changed, 5 insertions(+), 6 deletions(-) diff --git a/fs/io_uring.c b/fs/io_uring.c index 2166c469789d5..09aada153a71b 100644 --- a/fs/io_uring.c +++ b/fs/io_uring.c @@ -9124,16 +9124,15 @@ void __io_uring_task_cancel(void) prepare_to_wait(&tctx->wait, &wait, TASK_UNINTERRUPTIBLE); /* - * If we've seen completions, retry. This avoids a race where - * a completion comes in before we did prepare_to_wait(). + * If we've seen completions, retry without waiting. This + * avoids a race where a completion comes in before we did + * prepare_to_wait(). */ - if (inflight != tctx_inflight(tctx)) - continue; - schedule(); + if (inflight == tctx_inflight(tctx)) + schedule(); finish_wait(&tctx->wait, &wait); } while (1); - finish_wait(&tctx->wait, &wait); atomic_dec(&tctx->in_idle); io_uring_remove_task_files(tctx); -- GitLab