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authorAmit Shah <amit.shah@redhat.com>2010-02-12 06:02:14 +0100
committerRusty Russell <rusty@rustcorp.com.au>2010-02-24 04:52:29 +0100
commit3b8706240ee6084ccb46e53cd3a554356b7eeec8 (patch)
tree213051dfce6ddf5eb09d89ead56214372d200338 /drivers
parentvirtio: Add ability to detach unused buffers from vrings (diff)
downloadlinux-3b8706240ee6084ccb46e53cd3a554356b7eeec8.tar.xz
linux-3b8706240ee6084ccb46e53cd3a554356b7eeec8.zip
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>
Diffstat (limited to 'drivers')
-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 782b7292a3d8..0db906b3c95d 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;
}