send_sigio_to_port() checks the value of guest_connected, which we
always modify under the inbuf_lock; make sure invocations of
send_sigio_to_port() have take the inbuf_lock around the call.
Signed-off-by: Amit Shah <amit.s...@redhat.com>
---
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 b174945..3b9b541 100644
--- a/drivers/char/virtio_console.c
+++ b/drivers/char/virtio_console.c
@@ -1674,7 +1674,9 @@ static void handle_control_message(struct ports_device
*portdev,
* If the guest is connected, it'll be interested in
* knowing the host connection state changed.
*/
+ spin_lock_irq(&port->inbuf_lock);
send_sigio_to_port(port);
+ spin_unlock_irq(&port->inbuf_lock);
break;
case VIRTIO_CONSOLE_PORT_NAME:
/*
@@ -1794,13 +1796,13 @@ static void in_intr(struct virtqueue *vq)
if (!port->guest_connected && !is_rproc_serial(port->portdev->vdev))
discard_port_data(port);
+ /* Send a SIGIO indicating new data in case the process asked for it */
+ send_sigio_to_port(port);
+
spin_unlock_irqrestore(&port->inbuf_lock, flags);
wake_up_interruptible(&port->waitqueue);
- /* Send a SIGIO indicating new data in case the process asked for it */
- send_sigio_to_port(port);
-
if (is_console_port(port) && hvc_poll(port->cons.hvc))
hvc_kick();
}
--
1.8.1.4
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