static int vhost_scsi_setup_vq_cmds()

in scsi.c [1469:1521]

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

static int vhost_scsi_setup_vq_cmds(struct vhost_virtqueue *vq, int max_cmds)
{
	struct vhost_scsi_virtqueue *svq = container_of(vq,
					struct vhost_scsi_virtqueue, vq);
	struct vhost_scsi_cmd *tv_cmd;
	unsigned int i;

	if (svq->scsi_cmds)
		return 0;

	if (sbitmap_init_node(&svq->scsi_tags, max_cmds, -1, GFP_KERNEL,
			      NUMA_NO_NODE, false, true))
		return -ENOMEM;
	svq->max_cmds = max_cmds;

	svq->scsi_cmds = kcalloc(max_cmds, sizeof(*tv_cmd), GFP_KERNEL);
	if (!svq->scsi_cmds) {
		sbitmap_free(&svq->scsi_tags);
		return -ENOMEM;
	}

	for (i = 0; i < max_cmds; i++) {
		tv_cmd = &svq->scsi_cmds[i];

		tv_cmd->tvc_sgl = kcalloc(VHOST_SCSI_PREALLOC_SGLS,
					  sizeof(struct scatterlist),
					  GFP_KERNEL);
		if (!tv_cmd->tvc_sgl) {
			pr_err("Unable to allocate tv_cmd->tvc_sgl\n");
			goto out;
		}

		tv_cmd->tvc_upages = kcalloc(VHOST_SCSI_PREALLOC_UPAGES,
					     sizeof(struct page *),
					     GFP_KERNEL);
		if (!tv_cmd->tvc_upages) {
			pr_err("Unable to allocate tv_cmd->tvc_upages\n");
			goto out;
		}

		tv_cmd->tvc_prot_sgl = kcalloc(VHOST_SCSI_PREALLOC_PROT_SGLS,
					       sizeof(struct scatterlist),
					       GFP_KERNEL);
		if (!tv_cmd->tvc_prot_sgl) {
			pr_err("Unable to allocate tv_cmd->tvc_prot_sgl\n");
			goto out;
		}
	}
	return 0;
out:
	vhost_scsi_destroy_vq_cmds(vq);
	return -ENOMEM;
}