netdev - Re: [tipc-discussion] [PATCH net-next] tipc: remove two indentation levels in tipc_recv

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Date:	Tue, 29 Oct 2013 13:40:09 +0100
From:	Andreas Bofjäll <andreas.bofjall@...csson.com>
To:	Erik Hugne <erik.hugne@...csson.com>,
	David Laight <David.Laight@...LAB.COM>
CC:	<jon.maloy@...csson.com>, <netdev@...r.kernel.org>,
	<Paul.Gortmaker@...driver.com>,
	<tipc-discussion@...ts.sourceforge.net>, <davem@...emloft.net>
Subject: Re: [tipc-discussion] [PATCH net-next] tipc: remove two indentation
 levels in tipc_recv_msg routine

On 10/29/2013 01:07 PM, Erik Hugne wrote:
> On Tue, Oct 29, 2013 at 11:13:09AM +0000, David Laight wrote:
>> I can only see one 'goto cont', an explicit kfree_skb() and
>> continue would be clearer.
>
> There's actually a few more 'goto cont' in the early error checks
> in this function causes it to bail early. Those are not visible
> in the patchdiff however.

If you wanted to make this a bit simpler, you could make two labels and 
move the calls to tipc_node_unlock(n_ptr). The blocks on lines 1545, 
1558 and 1614 (in the patched code) could be replaced by a simple "goto 
unlock" this way.

--- link.c-old	2013-10-29 13:34:35.804926348 +0100
+++ link.c	2013-10-29 13:39:23.991842809 +0100
@@ -1541,10 +1541,8 @@

  		/* Locate unicast link endpoint that should handle message */
  		l_ptr = n_ptr->links[b_ptr->identity];
-		if (unlikely(!l_ptr)) {
-			tipc_node_unlock(n_ptr);
-			goto cont;
-		}
+		if (unlikely(!l_ptr))
+			goto unlock;

  		/* Verify that communication with node is currently allowed */
  		if ((n_ptr->block_setup & WAIT_PEER_DOWN) &&
@@ -1554,10 +1552,8 @@
  			!msg_redundant_link(msg))
  			n_ptr->block_setup &= ~WAIT_PEER_DOWN;

-		if (n_ptr->block_setup) {
-			tipc_node_unlock(n_ptr);
-			goto cont;
-		}
+		if (n_ptr->block_setup)
+			goto unlock;

  		/* Validate message sequence number info */
  		seq_no = msg_seqno(msg);
@@ -1611,8 +1607,7 @@
  				tipc_node_unlock(n_ptr);
  				continue;
  			}
-			tipc_node_unlock(n_ptr);
-			goto cont;
+			goto unlock;
  		}

  		/* Link is now in state WORKING_WORKING */
@@ -1681,6 +1676,9 @@
  		tipc_node_unlock(n_ptr);
  		tipc_net_route_msg(buf);
  		continue;
+
+unlock:
+		tipc_node_unlock(n_ptr);
  cont:
  		kfree_skb(buf);
  	}

/Andreas
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