virtio: Silence uninitialized variable warning

Smatch complains that we might not initialize "queue".  The issue is
callers like setup_vq() from virtio_pci_modern.c where "num" could be
something like 2 and "vring_align" is 64.  In that case, vring_size() is
less than PAGE_SIZE.  It won't happen in real life, but we're getting
the value of "num" from a register so it's not really possible to tell
what value it holds with static analysis.

Let's just silence the warning.

Signed-off-by: Dan Carpenter <dan.carpenter@oracle.com>
Signed-off-by: Michael S. Tsirkin <mst@redhat.com>

diff --git a/drivers/virtio/virtio_ring.c b/drivers/virtio/virtio_ring.c
index 5c802d47892c5091c971eaef256310f99b4d175d..ca6bfddaacad2beeb1897a0e397bd5300ccff30d 100644 (file)
--- a/drivers/virtio/virtio_ring.c
+++ b/drivers/virtio/virtio_ring.c
@@ -1006,7 +1006,7 @@ struct virtqueue *vring_create_virtqueue(
        const char *name)
 {
        struct virtqueue *vq;
-       void *queue;
+       void *queue = NULL;
        dma_addr_t dma_addr;
        size_t queue_size_in_bytes;
        struct vring vring;