static void detach_buf_packed()

in virtio_ring.c [1367:1411]

• 36 lines of code
• 8 McCabe index (conditional complexity)

static void detach_buf_packed(struct vring_virtqueue *vq,
			      unsigned int id, void **ctx)
{
	struct vring_desc_state_packed *state = NULL;
	struct vring_packed_desc *desc;
	unsigned int i, curr;

	state = &vq->packed.desc_state[id];

	/* Clear data ptr. */
	state->data = NULL;

	vq->packed.desc_extra[state->last].next = vq->free_head;
	vq->free_head = id;
	vq->vq.num_free += state->num;

	if (unlikely(vq->use_dma_api)) {
		curr = id;
		for (i = 0; i < state->num; i++) {
			vring_unmap_state_packed(vq,
				&vq->packed.desc_extra[curr]);
			curr = vq->packed.desc_extra[curr].next;
		}
	}

	if (vq->indirect) {
		u32 len;

		/* Free the indirect table, if any, now that it's unmapped. */
		desc = state->indir_desc;
		if (!desc)
			return;

		if (vq->use_dma_api) {
			len = vq->packed.desc_extra[id].len;
			for (i = 0; i < len / sizeof(struct vring_packed_desc);
					i++)
				vring_unmap_desc_packed(vq, &desc[i]);
		}
		kfree(desc);
		state->indir_desc = NULL;
	} else if (ctx) {
		*ctx = state->indir_desc;
	}
}