6 files changed, 18 insertions, 1 deletions

diff --git a/drivers/lguest/lguest_device.c b/drivers/lguest/lguest_device.c
index ccb7dfb028fa..fc92ccbd71dc 100644
--- a/drivers/lguest/lguest_device.c
+++ b/drivers/lguest/lguest_device.c
@@ -263,6 +263,9 @@ static struct virtqueue *lg_find_vq(struct virtio_device *vdev,
         struct virtqueue *vq;
         int err;
 
+        if (!name)
+                return NULL;
+
         /* We must have this many virtqueues. */
         if (index >= ldev->desc->num_vq)
                 return ERR_PTR(-ENOENT);
diff --git a/drivers/remoteproc/remoteproc_virtio.c b/drivers/remoteproc/remoteproc_virtio.c
index 343c1941c123..e7a4780e93db 100644
--- a/drivers/remoteproc/remoteproc_virtio.c
+++ b/drivers/remoteproc/remoteproc_virtio.c
@@ -84,6 +84,9 @@ static struct virtqueue *rp_find_vq(struct virtio_device *vdev,
         if (id >= ARRAY_SIZE(rvdev->vring))
                 return ERR_PTR(-EINVAL);
 
+        if (!name)
+                return NULL;
+
         ret = rproc_alloc_vring(rvdev, id);
         if (ret)
                 return ERR_PTR(ret);
diff --git a/drivers/s390/kvm/kvm_virtio.c b/drivers/s390/kvm/kvm_virtio.c
index 5565af20592f..7dabef624da3 100644
--- a/drivers/s390/kvm/kvm_virtio.c
+++ b/drivers/s390/kvm/kvm_virtio.c
@@ -190,6 +190,9 @@ static struct virtqueue *kvm_find_vq(struct virtio_device *vdev,
         if (index >= kdev->desc->num_vq)
                 return ERR_PTR(-ENOENT);
 
+        if (!name)
+                return NULL;
+
         config = kvm_vq_config(kdev->desc)+index;
 
         err = vmem_add_mapping(config->address,
diff --git a/drivers/virtio/virtio_mmio.c b/drivers/virtio/virtio_mmio.c
index 008bf58bdaae..5d7fee385b70 100644
--- a/drivers/virtio/virtio_mmio.c
+++ b/drivers/virtio/virtio_mmio.c
@@ -306,6 +306,9 @@ static struct virtqueue *vm_setup_vq(struct virtio_device *vdev, unsigned index,
         unsigned long flags, size;
         int err;
 
+        if (!name)
+                return NULL;
+
         /* Select the queue we're interested in */
         writel(index, vm_dev->base + VIRTIO_MMIO_QUEUE_SEL);
 
diff --git a/drivers/virtio/virtio_pci.c b/drivers/virtio/virtio_pci.c
index f5dfe6bdb959..42b20769d122 100644
--- a/drivers/virtio/virtio_pci.c
+++ b/drivers/virtio/virtio_pci.c
@@ -555,7 +555,10 @@ static int vp_try_to_find_vqs(struct virtio_device *vdev, unsigned nvqs,
         vp_dev->per_vq_vectors = per_vq_vectors;
         allocated_vectors = vp_dev->msix_used_vectors;
         for (i = 0; i < nvqs; ++i) {
-                if (!callbacks[i] || !vp_dev->msix_enabled)
+                if (!names[i]) {
+                        vqs[i] = NULL;
+                        continue;
+                } else if (!callbacks[i] || !vp_dev->msix_enabled)
                         msix_vec = VIRTIO_MSI_NO_VECTOR;
                 else if (vp_dev->per_vq_vectors)
                         msix_vec = allocated_vectors++;
diff --git a/include/linux/virtio_config.h b/include/linux/virtio_config.h
index 2c4a9895379d..e2850a7ea276 100644
--- a/include/linux/virtio_config.h
+++ b/include/linux/virtio_config.h
@@ -84,7 +84,9 @@
  *      nvqs: the number of virtqueues to find
  *      vqs: on success, includes new virtqueues
  *      callbacks: array of callbacks, for each virtqueue
+ *              include a NULL entry for vqs that do not need a callback
  *      names: array of virtqueue names (mainly for debugging)
+ *              include a NULL entry for vqs unused by driver
  *      Returns 0 on success or error status
  * @del_vqs: free virtqueues found by find_vqs().
  * @get_features: get the array of feature bits for this device.