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virtio_net: verify if queue is broken after virtqueue_get_buf()

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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: Heinz Graalfs <graalfs@linux.vnet.ibm.com>
Signed-off-by: Rusty Russell <rusty@rustcorp.com.au>
This commit is contained in:
Heinz Graalfs 2013-10-29 09:40:47 +10:30 committed by Rusty Russell
parent 40e4dc5301
commit 047b9b9495
1 changed files with 2 additions and 1 deletions
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3
drivers/net/virtio_net.c
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@ -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 /* Spin for a response, the kick causes an ioport write, trapping
* into the hypervisor, so the request should be handled immediately. * 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(); cpu_relax();
return status == VIRTIO_NET_OK; return status == VIRTIO_NET_OK;