diff options
| author | Xiaoguang Wang <xiaoguang.wang@linux.alibaba.com> | 2020-04-26 15:54:43 +0800 |
|---|---|---|
| committer | Jens Axboe <axboe@kernel.dk> | 2020-05-04 09:07:14 -0600 |
| commit | d8f1b9716cfd1a1f74c0fedad40c5f65a25aa208 (patch) | |
| tree | cb0332630931081c2499c1e74dbc0e51da8f5029 /fs/io_uring.c | |
| parent | 0e698dfa282211e414076f9dc7e83c1c288314fd (diff) | |
| download | lwn-d8f1b9716cfd1a1f74c0fedad40c5f65a25aa208.tar.gz lwn-d8f1b9716cfd1a1f74c0fedad40c5f65a25aa208.zip | |
io_uring: fix mismatched finish_wait() calls in io_uring_cancel_files()
The prepare_to_wait() and finish_wait() calls in io_uring_cancel_files()
are mismatched. Currently I don't see any issues related this bug, just
find it by learning codes.
Signed-off-by: Xiaoguang Wang <xiaoguang.wang@linux.alibaba.com>
Signed-off-by: Jens Axboe <axboe@kernel.dk>
Diffstat (limited to 'fs/io_uring.c')
| -rw-r--r-- | fs/io_uring.c | 9 |
1 files changed, 4 insertions, 5 deletions
diff --git a/fs/io_uring.c b/fs/io_uring.c index 0b91b0631173..6d52ff98279d 100644 --- a/fs/io_uring.c +++ b/fs/io_uring.c @@ -7360,11 +7360,9 @@ static int io_uring_release(struct inode *inode, struct file *file) static void io_uring_cancel_files(struct io_ring_ctx *ctx, struct files_struct *files) { - struct io_kiocb *req; - DEFINE_WAIT(wait); - while (!list_empty_careful(&ctx->inflight_list)) { - struct io_kiocb *cancel_req = NULL; + struct io_kiocb *cancel_req = NULL, *req; + DEFINE_WAIT(wait); spin_lock_irq(&ctx->inflight_lock); list_for_each_entry(req, &ctx->inflight_list, inflight_entry) { @@ -7404,6 +7402,7 @@ static void io_uring_cancel_files(struct io_ring_ctx *ctx, */ if (refcount_sub_and_test(2, &cancel_req->refs)) { io_put_req(cancel_req); + finish_wait(&ctx->inflight_wait, &wait); continue; } } @@ -7411,8 +7410,8 @@ static void io_uring_cancel_files(struct io_ring_ctx *ctx, io_wq_cancel_work(ctx->io_wq, &cancel_req->work); io_put_req(cancel_req); schedule(); + finish_wait(&ctx->inflight_wait, &wait); } - finish_wait(&ctx->inflight_wait, &wait); } static int io_uring_flush(struct file *file, void *data) |