From fe8e4649397915cf3b2ab0b695929a27e543967e Mon Sep 17 00:00:00 2001
From: Ying Xue <ying.xue@windriver.com>
Date: Thu, 6 Mar 2014 14:40:18 +0100
Subject: [PATCH] tipc: avoid to unnecessary process switch under non-block
 mode

When messages are received via tipc socket under non-block mode,
schedule_timeout() is called in tipc_wait_for_rcvmsg(), that is,
the process of receiving messages will be scheduled once although
timeout value passed to schedule_timeout() is 0. The same issue
exists in accept()/wait_for_accept(). To avoid this unnecessary
process switch, we only call schedule_timeout() if the timeout
value is non-zero.

Signed-off-by: Ying Xue <ying.xue@windriver.com>
Reviewed-by: Erik Hugne <erik.hugne@ericsson.com>
Reviewed-by: Jon Maloy <jon.maloy@ericsson.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
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