io_uring: break iopolling on signal

commit dc314886cb3d0e4ab2858003e8de2917f8a3ccbd upstream.

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>

diff --git a/io_uring/io_uring.c b/io_uring/io_uring.c
index e15abe2..6d455e2 100644 (file)
--- a/io_uring/io_uring.c
+++ b/io_uring/io_uring.c
@@ -1457,6 +1457,9 @@ static int io_iopoll_check(struct io_ring_ctx *ctx, long min)
                        break;
                nr_events += ret;
                ret = 0;
+
+               if (task_sigpending(current))
+                       return -EINTR;
        } while (nr_events < min && !need_resched());
 
        return ret;