From: Tung Nguyen <tung.q.nguyen@dektech.com.au>
Date: Tue, 19 Feb 2019 04:20:47 +0000 (+0700)
Subject: tipc: improve function tipc_wait_for_cond()
X-Git-Tag: v4.14.310~3
X-Git-Url: http://git.ipfire.org/cgi-bin/gitweb.cgi?a=commitdiff_plain;h=79f749ade7a61a56b9fe249a0a53ce8803b48b3e;p=thirdparty%2Fkernel%2Fstable.git

tipc: improve function tipc_wait_for_cond()

commit 223b7329ec6a0dae1b7f7db7b770e93f4a069ef9 upstream.

Commit 844cf763fba6 ("tipc: make macro tipc_wait_for_cond() smp safe")
replaced finish_wait() with remove_wait_queue() but still used
prepare_to_wait(). This causes unnecessary conditional
checking  before adding to wait queue in prepare_to_wait().

This commit replaces prepare_to_wait() with add_wait_queue()
as the pair function with remove_wait_queue().

Acked-by: Ying Xue <ying.xue@windriver.com>
Acked-by: Jon Maloy <jon.maloy@ericsson.com>
Signed-off-by: Tung Nguyen <tung.q.nguyen@dektech.com.au>
Signed-off-by: David S. Miller <davem@davemloft.net>
Cc: Lee Jones <lee@kernel.org>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
---

diff --git a/net/tipc/socket.c b/net/tipc/socket.c
index 40002d2afb8aa..5d9d9d693da04 100644
--- a/net/tipc/socket.c
+++ b/net/tipc/socket.c
@@ -373,7 +373,7 @@ static int tipc_sk_sock_err(struct socket *sock, long *timeout)
 		rc_ = tipc_sk_sock_err((sock_), timeo_);		       \
 		if (rc_)						       \
 			break;						       \
-		prepare_to_wait(sk_sleep(sk_), &wait_, TASK_INTERRUPTIBLE);    \
+		add_wait_queue(sk_sleep(sk_), &wait_);                         \
 		release_sock(sk_);					       \
 		*(timeo_) = wait_woken(&wait_, TASK_INTERRUPTIBLE, *(timeo_)); \
 		sched_annotate_sleep();				               \