virtio: Honour 'may_reduce_num' in vring_create_virtqueue

vring_create_virtqueue() allows the caller to specify via the
may_reduce_num parameter whether the vring code is allowed to
allocate a smaller ring than specified.

However, the split ring allocation code tries to allocate a
smaller ring on allocation failure regardless of what the
caller specified. This may cause trouble for e.g. virtio-pci
in legacy mode, which does not support ring resizing. (The
packed ring code does not resize in any case.)

Let's fix this by bailing out immediately in the split ring code
if the requested size cannot be allocated and may_reduce_num has
not been specified.

While at it, fix a typo in the usage instructions.

Fixes: 2a2d1382fe9d ("virtio: Add improved queue allocation API")
Cc: stable@vger.kernel.org # v4.6+
Signed-off-by: Cornelia Huck <cohuck@redhat.com>
Signed-off-by: Michael S. Tsirkin <mst@redhat.com>
Reviewed-by: Halil Pasic <pasic@linux.ibm.com>
Reviewed-by: Jens Freimann <jfreimann@redhat.com>

diff --git a/drivers/virtio/virtio_ring.c b/drivers/virtio/virtio_ring.c
index 18846afb39da189e3f0dd0168727e0cf2865549e..5df92c308286dc0f5afe203cf279adb3d8af8185 100644 (file)
--- a/drivers/virtio/virtio_ring.c
+++ b/drivers/virtio/virtio_ring.c
@@ -882,6 +882,8 @@ static struct virtqueue *vring_create_virtqueue_split(
                                          GFP_KERNEL|__GFP_NOWARN|__GFP_ZERO);
                if (queue)
                        break;
+               if (!may_reduce_num)
+                       return NULL;
        }
 
        if (!num)

diff --git a/include/linux/virtio_ring.h b/include/linux/virtio_ring.h
index fab02133a9197a43cd9df33728e657e1679c5e16..3dc70adfe5f5edbbfa6f6508849d1d3630a46e2b 100644 (file)
--- a/include/linux/virtio_ring.h
+++ b/include/linux/virtio_ring.h
@@ -63,7 +63,7 @@ struct virtqueue;
 /*
  * Creates a virtqueue and allocates the descriptor ring.  If
  * may_reduce_num is set, then this may allocate a smaller ring than
- * expected.  The caller should query virtqueue_get_ring_size to learn
+ * expected.  The caller should query virtqueue_get_vring_size to learn
  * the actual size of the ring.
  */
 struct virtqueue *vring_create_virtqueue(unsigned int index,