A helper is introduced for the logic of allocating the descriptor
extra data. This will be reused by split virtqueue.
Signed-off-by: Jason Wang <jasowang@xxxxxxxxxx>
---
drivers/virtio/virtio_ring.c | 30 ++++++++++++++++++++----------
1 file changed, 20 insertions(+), 10 deletions(-)
diff --git a/drivers/virtio/virtio_ring.c b/drivers/virtio/virtio_ring.c
index c25ea5776687..0cdd965dba58 100644
--- a/drivers/virtio/virtio_ring.c
+++ b/drivers/virtio/virtio_ring.c
@@ -1550,6 +1550,25 @@ static void *virtqueue_detach_unused_buf_packed(struct virtqueue *_vq)
return NULL;
}
+static struct vring_desc_extra *vring_alloc_desc_extra(struct vring_virtqueue *vq,
+ unsigned int num)
+{
+ struct vring_desc_extra *desc_extra;
+ unsigned int i;
+
+ desc_extra = kmalloc_array(num, sizeof(struct vring_desc_extra),
+ GFP_KERNEL);
+ if (!desc_extra)
+ return NULL;
+
+ memset(desc_extra, 0, num * sizeof(struct vring_desc_extra));
+
+ for (i = 0; i < num - 1; i++)
+ desc_extra[i].next = i + 1;
+
+ return desc_extra;
+}
+
static struct virtqueue *vring_create_virtqueue_packed(
unsigned int index,
unsigned int num,
@@ -1567,7 +1586,6 @@ static struct virtqueue *vring_create_virtqueue_packed(
struct vring_packed_desc_event *driver, *device;
dma_addr_t ring_dma_addr, driver_event_dma_addr, device_event_dma_addr;
size_t ring_size_in_bytes, event_size_in_bytes;
- unsigned int i;
ring_size_in_bytes = num * sizeof(struct vring_packed_desc);
@@ -1650,18 +1668,10 @@ static struct virtqueue *vring_create_virtqueue_packed(
/* Put everything in free lists. */
vq->free_head = 0;
- vq->packed.desc_extra = kmalloc_array(num,
- sizeof(struct vring_desc_extra),
- GFP_KERNEL);
+ vq->packed.desc_extra = vring_alloc_desc_extra(vq, num);
if (!vq->packed.desc_extra)
goto err_desc_extra;
- memset(vq->packed.desc_extra, 0,
- num * sizeof(struct vring_desc_extra));
-
- for (i = 0; i < num - 1; i++)
- vq->packed.desc_extra[i].next = i + 1;
-
/* No callback? Tell other side not to bother us. */
if (!callback) {
vq->packed.event_flags_shadow = VRING_PACKED_EVENT_FLAG_DISABLE;
--
2.25.1
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