This is a note to let you know that I've just added the patch titled
virtio: console: fix raising SIGIO after port unplug
to the 3.4-stable tree which can be found at:
http://www.kernel.org/git/?p=linux/kernel/git/stable/stable-queue.git;a=summary
The filename of the patch is:
virtio-console-fix-raising-sigio-after-port-unplug.patch
and it can be found in the queue-3.4 subdirectory.
If you, or anyone else, feels it should not be added to the stable tree,
please let <stable@xxxxxxxxxxxxxxx> know about it.
>From 92d3453815fbe74d539c86b60dab39ecdf01bb99 Mon Sep 17 00:00:00 2001
From: Amit Shah <amit.shah@xxxxxxxxxx>
Date: Mon, 29 Jul 2013 14:21:32 +0930
Subject: virtio: console: fix raising SIGIO after port unplug
From: Amit Shah <amit.shah@xxxxxxxxxx>
commit 92d3453815fbe74d539c86b60dab39ecdf01bb99 upstream.
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.
Signed-off-by: Amit Shah <amit.shah@xxxxxxxxxx>
Signed-off-by: Rusty Russell <rusty@xxxxxxxxxxxxxxx>
Signed-off-by: Greg Kroah-Hartman <gregkh@xxxxxxxxxxxxxxxxxxx>
---
drivers/char/virtio_console.c | 8 +++++---
1 file changed, 5 insertions(+), 3 deletions(-)
--- a/drivers/char/virtio_console.c
+++ b/drivers/char/virtio_console.c
@@ -1286,12 +1286,14 @@ static void unplug_port(struct port *por
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)) {
Patches currently in stable-queue which might be from amit.shah@xxxxxxxxxx are
queue-3.4/virtio-console-fix-raising-sigio-after-port-unplug.patch
queue-3.4/virtio-console-clean-up-port-data-immediately-at-time-of-unplug.patch
queue-3.4/virtio-console-fix-race-in-port_fops_open-and-port-unplug.patch
queue-3.4/virtio-console-return-enodev-on-all-read-operations-after-unplug.patch
queue-3.4/virtio-console-fix-race-with-port-unplug-and-open-close.patch
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