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Commit 2770c5ea authored by Amit Shah's avatar Amit Shah Committed by Rusty Russell
Browse files

virtio: console: Wake up outvq on host notifications 



The outvq needs to be woken up on host notifications so that buffers
consumed by the host can be reclaimed, outvq freed, and application
writes may proceed again.

The need for this is now finally noticed when I have qemu patches ready
to use nonblocking IO and flow control.

CC: Hans de Goede <hdegoede@redhat.com>
CC: stable@kernel.org
Signed-off-by: default avatarAmit Shah <amit.shah@redhat.com>
Signed-off-by: default avatarRusty Russell <rusty@rustcorp.com.au>
Acked-by: default avatarHans de Goede <hdegoede@redhat.com>
parent afe8a887

drivers/tty/hvc/virtio_console.c

+13 −2
Original line number Diff line number Diff line
@@ -1462,6 +1462,17 @@ static void control_work_handler(struct work_struct *work) 
	spin_unlock(&portdev->cvq_lock);

}



static void out_intr(struct virtqueue *vq)

{

	struct port *port;



	port = find_port_by_vq(vq->vdev->priv, vq);

	if (!port)

		return;



	wake_up_interruptible(&port->waitqueue);

}



static void in_intr(struct virtqueue *vq)

{

	struct port *port;
@@ -1566,7 +1577,7 @@ static int init_vqs(struct ports_device *portdev) 
	 */

	j = 0;

	io_callbacks[j] = in_intr;

	io_callbacks[j + 1] = NULL;

	io_callbacks[j + 1] = out_intr;

	io_names[j] = "input";

	io_names[j + 1] = "output";

	j += 2;
@@ -1580,7 +1591,7 @@ static int init_vqs(struct ports_device *portdev) 
		for (i = 1; i < nr_ports; i++) {

			j += 2;

			io_callbacks[j] = in_intr;

			io_callbacks[j + 1] = NULL;

			io_callbacks[j + 1] = out_intr;

			io_names[j] = "input";

			io_names[j + 1] = "output";

		}