在 2022/7/26 15:22, Xuan Zhuo 写道:
Separate the logic for alloc desc_state and desc_extra, which will
be called separately by subsequent patches.
Use struct vring_packed to pass desc_state, desc_extra.
Signed-off-by: Xuan Zhuo <xuanzhuo@xxxxxxxxxxxxxxxxx>
Acked-by: Jason Wang <jasowang@xxxxxxxxxx>
---
drivers/virtio/virtio_ring.c | 48 +++++++++++++++++++++++++-----------
1 file changed, 34 insertions(+), 14 deletions(-)
diff --git a/drivers/virtio/virtio_ring.c b/drivers/virtio/virtio_ring.c
index 10cc2b7e3588..32590d763c3b 100644
--- a/drivers/virtio/virtio_ring.c
+++ b/drivers/virtio/virtio_ring.c
@@ -1908,6 +1908,33 @@ static int vring_alloc_queue_packed(struct vring_virtqueue_packed *vring_packed,
return -ENOMEM;
}
+static int vring_alloc_state_extra_packed(struct vring_virtqueue_packed *vring_packed)
+{
+ struct vring_desc_state_packed *state;
+ struct vring_desc_extra *extra;
+ u32 num = vring_packed->vring.num;
+
+ state = kmalloc_array(num, sizeof(struct vring_desc_state_packed), GFP_KERNEL);
+ if (!state)
+ goto err_desc_state;
+
+ memset(state, 0, num * sizeof(struct vring_desc_state_packed));
+
+ extra = vring_alloc_desc_extra(num);
+ if (!extra)
+ goto err_desc_extra;
+
+ vring_packed->desc_state = state;
+ vring_packed->desc_extra = extra;
+
+ return 0;
+
+err_desc_extra:
+ kfree(state);
+err_desc_state:
+ return -ENOMEM;
+}
+
static struct virtqueue *vring_create_virtqueue_packed(
unsigned int index,
unsigned int num,
@@ -1922,6 +1949,7 @@ static struct virtqueue *vring_create_virtqueue_packed(
{
struct vring_virtqueue_packed vring_packed = {};
struct vring_virtqueue *vq;
+ int err;
if (vring_alloc_queue_packed(&vring_packed, vdev, num))
goto err_ring;
@@ -1961,18 +1989,12 @@ static struct virtqueue *vring_create_virtqueue_packed(
vq->packed.event_flags_shadow = 0;
vq->packed.avail_used_flags = 1 << VRING_PACKED_DESC_F_AVAIL;
- vq->packed.desc_state = kmalloc_array(num,
- sizeof(struct vring_desc_state_packed),
- GFP_KERNEL);
- if (!vq->packed.desc_state)
- goto err_desc_state;
-
- memset(vq->packed.desc_state, 0,
- num * sizeof(struct vring_desc_state_packed));
+ err = vring_alloc_state_extra_packed(&vring_packed);
+ if (err)
+ goto err_state_extra;
- vq->packed.desc_extra = vring_alloc_desc_extra(num);
- if (!vq->packed.desc_extra)
- goto err_desc_extra;
+ vq->packed.desc_state = vring_packed.desc_state;
+ vq->packed.desc_extra = vring_packed.desc_extra;
/* No callback? Tell other side not to bother us. */
if (!callback) {
@@ -1988,9 +2010,7 @@ static struct virtqueue *vring_create_virtqueue_packed(
spin_unlock(&vdev->vqs_list_lock);
return &vq->vq;
-err_desc_extra:
- kfree(vq->packed.desc_state);
-err_desc_state:
+err_state_extra:
kfree(vq);
err_vq:
vring_free_packed(&vring_packed, vdev);
