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virtio: console: tell host of open ports after resume from s3/s4

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If a port was open before going into one of the sleep states, the port
can continue normal operation after restore.  However, the host has to
be told that the guest side of the connection is open to restore
pre-suspend state.

This wasn't noticed so far due to a bug in qemu that was fixed recently
(which marked the guest-side connection as always open).

CC: stable@vger.kernel.org   # Only for 3.3

Signed-off-by: Amit Shah <amit.shah@redhat.com>
Signed-off-by: Michael S. Tsirkin <mst@redhat.com>
This commit is contained in:
Amit Shah 2012-04-25 14:40:39 +05:30 committed by Michael S. Tsirkin
parent 0e93b4b304
commit fa8b66ccd2
1 changed files with 7 additions and 0 deletions
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7
drivers/char/virtio_console.c
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@ -1895,6 +1895,13 @@ static int virtcons_restore(struct virtio_device *vdev)
/* Get port open/close status on the host */
send_control_msg(port, VIRTIO_CONSOLE_PORT_READY, 1);
/*
* If a port was open at the time of suspending, we
* have to let the host know that it's still open.
*/
if (port->guest_connected)
send_control_msg(port, VIRTIO_CONSOLE_PORT_OPEN, 1);
}
return 0;
}