virtio: console: Send SIGIO on new data arrival on ports

Send a SIGIO signal when new data arrives on a port. This is sent only
when the process has requested for the signal to be sent using fcntl().

Signed-off-by: Amit Shah <amit.shah@redhat.com>
Signed-off-by: Rusty Russell <rusty@rustcorp.com.au>

1 files changed, 3 insertions, 0 deletions

diff --git a/drivers/char/virtio_console.c b/drivers/char/virtio_console.c
index c4ca43694233..6d5c579b1693 100644
--- a/drivers/char/virtio_console.c
+++ b/drivers/char/virtio_console.c
@@ -1483,6 +1483,9 @@ static void in_intr(struct virtqueue *vq)
 
         wake_up_interruptible(&port->waitqueue);
 
+        /* Send a SIGIO indicating new data in case the process asked for it */
+        send_sigio_to_port(port);
+
         if (is_console_port(port) && hvc_poll(port->cons.hvc))
                 hvc_kick();
 }