int vmbus_teardown_gpadl()

in channel.c [828:890]

• 42 lines of code
• 6 McCabe index (conditional complexity)

int vmbus_teardown_gpadl(struct vmbus_channel *channel, struct vmbus_gpadl *gpadl)
{
	struct vmbus_channel_gpadl_teardown *msg;
	struct vmbus_channel_msginfo *info;
	unsigned long flags;
	int ret;

	info = kzalloc(sizeof(*info) +
		       sizeof(struct vmbus_channel_gpadl_teardown), GFP_KERNEL);
	if (!info)
		return -ENOMEM;

	init_completion(&info->waitevent);
	info->waiting_channel = channel;

	msg = (struct vmbus_channel_gpadl_teardown *)info->msg;

	msg->header.msgtype = CHANNELMSG_GPADL_TEARDOWN;
	msg->child_relid = channel->offermsg.child_relid;
	msg->gpadl = gpadl->gpadl_handle;

	spin_lock_irqsave(&vmbus_connection.channelmsg_lock, flags);
	list_add_tail(&info->msglistentry,
		      &vmbus_connection.chn_msg_list);
	spin_unlock_irqrestore(&vmbus_connection.channelmsg_lock, flags);

	if (channel->rescind)
		goto post_msg_err;

	ret = vmbus_post_msg(msg, sizeof(struct vmbus_channel_gpadl_teardown),
			     true);

	trace_vmbus_teardown_gpadl(msg, ret);

	if (ret)
		goto post_msg_err;

	wait_for_completion(&info->waitevent);

	gpadl->gpadl_handle = 0;

post_msg_err:
	/*
	 * If the channel has been rescinded;
	 * we will be awakened by the rescind
	 * handler; set the error code to zero so we don't leak memory.
	 */
	if (channel->rescind)
		ret = 0;

	spin_lock_irqsave(&vmbus_connection.channelmsg_lock, flags);
	list_del(&info->msglistentry);
	spin_unlock_irqrestore(&vmbus_connection.channelmsg_lock, flags);

	kfree(info);

	ret = set_memory_encrypted((unsigned long)gpadl->buffer,
				   PFN_UP(gpadl->size));
	if (ret)
		pr_warn("Fail to set mem host visibility in GPADL teardown %d.\n", ret);

	return ret;
}