3.6.11.9-rc1 stable review patch.
If anyone has any objections, please let me know.
------------------
From: Amit Shah <amit.shah@xxxxxxxxxx>
[ Upstream commit 92d3453815fbe74d539c86b60dab39ecdf01bb99 ]
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@xxxxxxxxxxxxxxx>
Signed-off-by: Amit Shah <amit.shah@xxxxxxxxxx>
Signed-off-by: Rusty Russell <rusty@xxxxxxxxxxxxxxx>
Signed-off-by: Steven Rostedt <rostedt@xxxxxxxxxxx>
---
drivers/char/virtio_console.c | 8 +++++---
1 file changed, 5 insertions(+), 3 deletions(-)
diff --git a/drivers/char/virtio_console.c b/drivers/char/virtio_console.c
index e6a51da..4df55cb 100644
--- a/drivers/char/virtio_console.c
+++ b/drivers/char/virtio_console.c
@@ -1290,12 +1290,14 @@ static void unplug_port(struct port *port)
spin_unlock_irq(&port->portdev->ports_lock);
if (port->guest_connected) {
+ /* 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);
- /* Let the app know the port is going down. */
- send_sigio_to_port(port);
+ wake_up_interruptible(&port->waitqueue);
}
if (is_console_port(port)) {
--
1.7.10.4
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