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virtio_ring: add new function virtqueue_is_broken()

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Add new function virtqueue_is_broken(). Callers of virtqueue_get_buf()
should check for a broken queue.

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 09:40:19 +10:30 committed by Rusty Russell
parent 53c18c9906
commit b3b32c9413
2 changed files with 10 additions and 0 deletions
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8
drivers/virtio/virtio_ring.c
View File

@ -851,4 +851,12 @@ unsigned int virtqueue_get_vring_size(struct virtqueue *_vq)
}
EXPORT_SYMBOL_GPL(virtqueue_get_vring_size);
bool virtqueue_is_broken(struct virtqueue *_vq)
{
struct vring_virtqueue *vq = to_vvq(_vq);
return vq->broken;
}
EXPORT_SYMBOL_GPL(virtqueue_is_broken);
MODULE_LICENSE("GPL");

2
include/linux/virtio.h
View File

@ -73,6 +73,8 @@ void *virtqueue_detach_unused_buf(struct virtqueue *vq);
unsigned int virtqueue_get_vring_size(struct virtqueue *vq);
bool virtqueue_is_broken(struct virtqueue *vq);
/**
* virtio_device - representation of a device using virtio
* @index: unique position on the virtio bus