bool find_node()

in common/ipmi/ipmb.c [171:247]
60 lines of code
17 McCabe index (conditional complexity)

bool find_node(ipmi_msg_cfg *pnode, ipmi_msg *msg, int seq_index, uint8_t index)
{
	ipmi_msg_cfg *ptr_start = pnode;
	int ret;

	ret = k_mutex_lock(&mutex_id[index], K_MSEC(1000));
	if (ret) {
		printk("find_node: mutex get fail status:%x\n", ret);
		return false;
	} else {
		if (seq_index == 0) { // receive response and find sent request
			while ((pnode != NULL && pnode->next != ptr_start) &&
			       (((pnode->next)->buffer.netfn != (msg->netfn - 1)) ||
				((pnode->next)->buffer.cmd != msg->cmd) ||
				((pnode->next)->buffer.seq_target != msg->seq_target))) {
				pnode = pnode->next;
			}
		} else {
			while ((pnode != NULL && pnode->next != ptr_start) &&
			       (((pnode->next)->buffer.netfn != msg->netfn) ||
				((pnode->next)->buffer.cmd != msg->cmd) ||
				((pnode->next)->buffer.seq_source != msg->seq_source))) {
				pnode = pnode->next;
			}
		}

		if (pnode == NULL) {
			printf("pnode list should be circular, list end found\n");
			k_mutex_unlock(&mutex_id[index]);
			return false;
		}

		if (pnode->next == ptr_start) {
			printf("no req match recv resp\n");
			printf("node netfn: %x,cmd: %x, seq_t: %x\n", (pnode->next)->buffer.netfn,
			       (pnode->next)->buffer.cmd, (pnode->next)->buffer.seq_target);
			printf("msg netfn: %x,cmd: %x, seq_t: %x\n\n", msg->netfn, msg->cmd,
			       msg->seq_target);
			k_mutex_unlock(&mutex_id[index]);
			return false;
		}

		/* Now pointer points to a node and the node next to it has to be removed */
		ipmi_msg_cfg *temp;
		temp = pnode->next;

		if (temp == NULL) {
			printf("pnode list should be circular, list end found\n");
			k_mutex_unlock(&mutex_id[index]);
			return false;
		}

		/*get the target<->Bridge IC IPMB seq number*/
		if (seq_index == 0) {
			// find source sequence for responding
			msg->seq_source = temp->buffer.seq_source;
			unregister_seq(index, temp->buffer.seq_target);
		} else {
			msg->seq_target = temp->buffer.seq_target;
		}

		msg->InF_source = temp->buffer.InF_source;
		msg->InF_target = temp->buffer.InF_target;
		/*temp points to the node which has to be removed*/
		pnode->next = temp->next;
		/*We removed the node which is next to the pointer (which is also temp) */

		/* Beacuse we deleted the node, we no longer require the memory used for it .
       free() will deallocate the memory.
     */
		free(temp);
		seq_current_count[index]--;

		k_mutex_unlock(&mutex_id[index]);
		return true;
	}
}