Commit 047b9b94 authored by Heinz Graalfs's avatar Heinz Graalfs Committed by Rusty Russell
Browse files

virtio_net: verify if queue is broken after virtqueue_get_buf() 



If a virtqueue_get_buf() call returns a NULL pointer a possibly endless while
loop should be avoided by checking for a broken virtqueue.

Signed-off-by: default avatarHeinz Graalfs <graalfs@linux.vnet.ibm.com>
Signed-off-by: default avatarRusty Russell <rusty@rustcorp.com.au>
parent 40e4dc53

drivers/net/virtio_net.c

+2 −1
Original line number Diff line number Diff line
@@ -825,7 +825,8 @@ static bool virtnet_send_command(struct virtnet_info *vi, u8 class, u8 cmd, 
	/* Spin for a response, the kick causes an ioport write, trapping

	 * into the hypervisor, so the request should be handled immediately.

	 */

	while (!virtqueue_get_buf(vi->cvq, &tmp))

	while (!virtqueue_get_buf(vi->cvq, &tmp) &&

	       !virtqueue_is_broken(vi->cvq))

		cpu_relax();



	return status == VIRTIO_NET_OK;