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authorAmit Shah <amit.shah@redhat.com>2010-02-12 10:32:14 +0530
committerRusty Russell <rusty@rustcorp.com.au>2010-02-24 14:22:29 +1030
commit3b8706240ee6084ccb46e53cd3a554356b7eeec8 (patch)
tree213051dfce6ddf5eb09d89ead56214372d200338
parentc021eac4148c16bf53baa0dd14e8ebee6f39dab5 (diff)
downloadop-kernel-dev-3b8706240ee6084ccb46e53cd3a554356b7eeec8.zip
op-kernel-dev-3b8706240ee6084ccb46e53cd3a554356b7eeec8.tar.gz
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>
-rw-r--r--drivers/virtio/virtio_ring.c5
1 files changed, 4 insertions, 1 deletions
diff --git a/drivers/virtio/virtio_ring.c b/drivers/virtio/virtio_ring.c
index 782b729..0db906b 100644
--- a/drivers/virtio/virtio_ring.c
+++ b/drivers/virtio/virtio_ring.c
@@ -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;
}
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