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virtio: Initialize vq->data entries to NULL 

vq operations depend on vq->data[i] being NULL to figure out if the vq
entry is in use (since the previous patch).

We have to initialize them to NULL to ensure we don't work with junk
data and trigger false BUG_ONs.

Signed-off-by: Amit Shah <amit.shah@redhat.com>
Signed-off-by: Rusty Russell <rusty@rustcorp.com.au>
Cc: Shirley Ma <xma@us.ibm.com>
This commit is contained in:
Amit Shah 2010-02-12 10:32:14 +05:30 committed by Rusty Russell
parent c021eac414
commit 3b8706240e
1 changed files with 4 additions and 1 deletions
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5
drivers/virtio/virtio_ring.c
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@ -448,8 +448,11 @@ struct virtqueue *vring_new_virtqueue(unsigned int num,
/* Put everything in free lists. */
vq->num_free = num;
vq->free_head = 0;
for (i = 0; i < num-1; i++)
for (i = 0; i < num-1; i++) {
vq->vring.desc[i].next = i+1;
vq->data[i] = NULL;
}
vq->data[i] = NULL;
return &vq->vq;
}