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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: Heinz Graalfs <graalfs@linux.vnet.ibm.com> Signed-off-by: Rusty Russell <rusty@rustcorp.com.au>
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1 changed files with 2 additions and 1 deletions
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@ -825,7 +825,8 @@ static bool virtnet_send_command(struct virtnet_info *vi, u8 class, u8 cmd,
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/* Spin for a response, the kick causes an ioport write, trapping
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* into the hypervisor, so the request should be handled immediately.
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*/
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while (!virtqueue_get_buf(vi->cvq, &tmp))
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while (!virtqueue_get_buf(vi->cvq, &tmp) &&
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!virtqueue_is_broken(vi->cvq))
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cpu_relax();
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return status == VIRTIO_NET_OK;
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