Port unplug can race with close() in port_fops_release().
port_fops_release() already takes the necessary locks, ensure
unplug_port() does that too.
Signed-off-by: Amit Shah <amit.shah@xxxxxxxxxx>
---
drivers/char/virtio_console.c | 2 ++
1 file changed, 2 insertions(+)
diff --git a/drivers/char/virtio_console.c b/drivers/char/virtio_console.c
index dd0020d..b174945 100644
--- a/drivers/char/virtio_console.c
+++ b/drivers/char/virtio_console.c
@@ -1545,6 +1545,7 @@ static void unplug_port(struct port *port)
list_del(&port->list);
spin_unlock_irq(&port->portdev->ports_lock);
+ spin_lock_irq(&port->inbuf_lock);
if (port->guest_connected) {
port->host_connected = false;
wake_up_interruptible(&port->waitqueue);
@@ -1555,6 +1556,7 @@ static void unplug_port(struct port *port)
/* Do this last so that sigio is actually sent */
port->guest_connected = false;
}
+ spin_unlock_irq(&port->inbuf_lock);
if (is_console_port(port)) {
spin_lock_irq(&pdrvdata_lock);
--
1.8.1.4
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