1 files changed, 5 insertions, 0 deletions

diff --git a/drivers/char/virtio_console.c b/drivers/char/virtio_console.c
index 2dd9134faa27..ce5f3fc25d6d 100644
--- a/drivers/char/virtio_console.c
+++ b/drivers/char/virtio_console.c
@@ -150,6 +150,7 @@ struct ports_device {
 
         /* To protect the vq operations for the control channel */
         spinlock_t c_ivq_lock;
+        spinlock_t c_ovq_lock;
 
         /* The current config space is stored here */
         struct virtio_console_config config;
@@ -569,11 +570,14 @@ static ssize_t __send_control_msg(struct ports_device *portdev, u32 port_id,
         vq = portdev->c_ovq;
 
         sg_init_one(sg, &cpkt, sizeof(cpkt));
+
+        spin_lock(&portdev->c_ovq_lock);
         if (virtqueue_add_buf(vq, sg, 1, 0, &cpkt, GFP_ATOMIC) == 0) {
                 virtqueue_kick(vq);
                 while (!virtqueue_get_buf(vq, &len))
                         cpu_relax();
         }
+        spin_unlock(&portdev->c_ovq_lock);
         return 0;
 }
 
@@ -1997,6 +2001,7 @@ static int virtcons_probe(struct virtio_device *vdev)
                 unsigned int nr_added_bufs;
 
                 spin_lock_init(&portdev->c_ivq_lock);
+                spin_lock_init(&portdev->c_ovq_lock);
                 INIT_WORK(&portdev->control_work, &control_work_handler);
 
                 nr_added_bufs = fill_queue(portdev->c_ivq,