[PATCH 5.10 316/406] io_uring: break iopolling on signal

Greg Kroah-Hartman
2023-09-17T19:38:05Z

From: Pavel Begunkov <asml.silence@gmail.com>

[ upstream commit dc314886cb3d0e4ab2858003e8de2917f8a3ccbd ]

Don't keep spinning iopoll with a signal set. It'll eventually return
back, e.g. by virtue of need_resched(), but it's not a nice user
experience.

Cc: stable@vger.kernel.org
Fixes: def596e9557c9 ("io_uring: support for IO polling")
Signed-off-by: Pavel Begunkov <asml.silence@gmail.com>
Link: https://lore.kernel.org/r/eeba551e82cad12af30c3220125eb6cb244cc94c.1691594339.git.asml.silence@gmail.com
Signed-off-by: Jens Axboe <axboe@kernel.dk>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
---
io_uring/io_uring.c | 5 +++++
1 file changed, 5 insertions(+)

--- a/io_uring/io_uring.c
+++ b/io_uring/io_uring.c
@@ -2665,6 +2665,11 @@ static int io_iopoll_check(struct io_rin
break;
}
ret = io_do_iopoll(ctx, &nr_events, min);
+
+ if (task_sigpending(current)) {
+ ret = -EINTR;
+ goto out;
+ }
} while (!ret && nr_events < min && !need_resched());
out:
mutex_unlock(&ctx->uring_lock);