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virtio: console: fix raising SIGIO after port unplug 

SIGIO should be sent when a port gets unplugged.  It should only be sent
to prcesses that have the port opened, and have asked for SIGIO to be
delivered.  We were clearing out guest_connected before calling
send_sigio_to_port(), resulting in a sigio not getting sent to
processes.

Fix by setting guest_connected to false after invoking the sigio
function.

CC: <stable@vger.kernel.org>
Signed-off-by: Amit Shah <amit.shah@redhat.com>
Signed-off-by: Rusty Russell <rusty@rustcorp.com.au>
This commit is contained in:
Amit Shah 2013-07-29 14:21:32 +09:30 committed by Rusty Russell
parent ea3768b438
commit 92d3453815
1 changed files with 6 additions and 4 deletions
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10
drivers/char/virtio_console.c
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@ -1551,12 +1551,14 @@ static void unplug_port(struct port *port)
spin_unlock_irq(&port->portdev->ports_lock);
if (port->guest_connected) {
port->guest_connected = false;
port->host_connected = false;
wake_up_interruptible(&port->waitqueue);
/* Let the app know the port is going down. */
send_sigio_to_port(port);
/* Do this after sigio is actually sent */
port->guest_connected = false;
port->host_connected = false;
wake_up_interruptible(&port->waitqueue);
}
if (is_console_port(port)) {