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From:   Greg Kroah-Hartman <gregkh@linuxfoundation.org>
To:     linux-kernel@vger.kernel.org
Cc:     Greg Kroah-Hartman <gregkh@linuxfoundation.org>,
        stable@vger.kernel.org, "Michael S. Tsirkin" <mst@redhat.com>
Subject: [PATCH 4.16 027/113] virtio_console: drop custom control queue cleanup
Date:   Mon, 30 Apr 2018 12:23:58 -0700
Message-Id: <20180430184016.216294156@linuxfoundation.org>
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4.16-stable review patch.  If anyone has any objections, please let me know.

------------------

From: Michael S. Tsirkin <mst@redhat.com>

commit 61a8950c5c5708cf2068b29ffde94e454e528208 upstream.

We now cleanup all VQs on device removal - no need
to handle the control VQ specially.

Cc: stable@vger.kernel.org
Signed-off-by: Michael S. Tsirkin <mst@redhat.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

---
 drivers/char/virtio_console.c |   17 -----------------
 1 file changed, 17 deletions(-)

--- a/drivers/char/virtio_console.c
+++ b/drivers/char/virtio_console.c
@@ -1988,21 +1988,6 @@ static void remove_vqs(struct ports_devi
 	kfree(portdev->out_vqs);
 }
 
-static void remove_controlq_data(struct ports_device *portdev)
-{
-	struct port_buffer *buf;
-	unsigned int len;
-
-	if (!use_multiport(portdev))
-		return;
-
-	while ((buf = virtqueue_get_buf(portdev->c_ivq, &len)))
-		free_buf(buf, true);
-
-	while ((buf = virtqueue_detach_unused_buf(portdev->c_ivq)))
-		free_buf(buf, true);
-}
-
 /*
  * Once we're further in boot, we get probed like any other virtio
  * device.
@@ -2163,7 +2148,6 @@ static void virtcons_remove(struct virti
 	 * have to just stop using the port, as the vqs are going
 	 * away.
 	 */
-	remove_controlq_data(portdev);
 	remove_vqs(portdev);
 	kfree(portdev);
 }
@@ -2208,7 +2192,6 @@ static int virtcons_freeze(struct virtio
 	 */
 	if (use_multiport(portdev))
 		virtqueue_disable_cb(portdev->c_ivq);
-	remove_controlq_data(portdev);
 
 	list_for_each_entry(port, &portdev->ports, list) {
 		virtqueue_disable_cb(port->in_vq);