io_req_task_submit() might be called for IOPOLL, do the fail path under
uring_lock to comply with IOPOLL synchronisation based solely on it.
Signed-off-by: Pavel Begunkov <asml.silence@xxxxxxxxx>
---
fs/io_uring.c | 4 ++--
1 file changed, 2 insertions(+), 2 deletions(-)
diff --git a/fs/io_uring.c b/fs/io_uring.c
index 9c554adf3993..1c32d4700caf 100644
--- a/fs/io_uring.c
+++ b/fs/io_uring.c
@@ -2143,14 +2143,14 @@ static void __io_req_task_submit(struct io_kiocb *req)
{
struct io_ring_ctx *ctx = req->ctx;
+ mutex_lock(&ctx->uring_lock);
if (!__io_sq_thread_acquire_mm(ctx) &&
!__io_sq_thread_acquire_files(ctx)) {
- mutex_lock(&ctx->uring_lock);
__io_queue_sqe(req, NULL);
- mutex_unlock(&ctx->uring_lock);
} else {
__io_req_task_cancel(req, -EFAULT);
}
+ mutex_unlock(&ctx->uring_lock);
}
static void io_req_task_submit(struct callback_head *cb)
--
2.24.0
