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virtio_scsi: verify if queue is broken after virtqueue_get_buf() 

If virtqueue_get_buf() returned with a NULL pointer avoid a possibly
endless loop 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 2013-11-11 11:52:43 +10:30 committed by Rusty Russell
parent cdd77e87ea
commit 2bf4fd3139
1 changed files with 3 additions and 0 deletions
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3
drivers/scsi/virtio_scsi.c
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@ -224,6 +224,9 @@ static void virtscsi_vq_done(struct virtio_scsi *vscsi,
virtqueue_disable_cb(vq); virtqueue_disable_cb(vq);
while ((buf = virtqueue_get_buf(vq, &len)) != NULL) while ((buf = virtqueue_get_buf(vq, &len)) != NULL)
fn(vscsi, buf); fn(vscsi, buf);
if (unlikely(virtqueue_is_broken(vq)))
break;
} while (!virtqueue_enable_cb(vq)); } while (!virtqueue_enable_cb(vq));
spin_unlock_irqrestore(&virtscsi_vq->vq_lock, flags); spin_unlock_irqrestore(&virtscsi_vq->vq_lock, flags);
} }