linux-kernel - [PATCH 14/14] video: of: display_timing: delete unneeded test before of_node

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Date:	Fri,  8 Aug 2014 12:07:55 +0200
From:	Julia Lawall <Julia.Lawall@...6.fr>
To:	Jean-Christophe Plagniol-Villard <plagnioj@...osoft.com>
Cc:	kernel-janitors@...r.kernel.org,
	Tomi Valkeinen <tomi.valkeinen@...com>,
	linux-fbdev@...r.kernel.org, linux-kernel@...r.kernel.org,
	Uwe Kleine-König 
	<u.kleine-koenig@...gutronix.de>
Subject: [PATCH 14/14] video: of: display_timing: delete unneeded test before of_node_put

From: Julia Lawall <Julia.Lawall@...6.fr>

Of_node_put supports NULL as its argument, so the initial test is not
necessary.  Furthermore, native_mode cannot be NULL at this point.

Suggested by Uwe Kleine-König.

The semantic patch that fixes this problem is as follows:
(http://coccinelle.lip6.fr/)

// <smpl>
@@
expression e;
@@

-if (e)
   of_node_put(e);
// </smpl>

Signed-off-by: Julia Lawall <Julia.Lawall@...6.fr>

---
 drivers/video/of_display_timing.c |    3 +--
 1 file changed, 1 insertion(+), 2 deletions(-)

diff --git a/drivers/video/of_display_timing.c b/drivers/video/of_display_timing.c
index 987edf1..339f831 100644
--- a/drivers/video/of_display_timing.c
+++ b/drivers/video/of_display_timing.c
@@ -233,8 +233,7 @@ struct display_timings *of_get_display_timings(struct device_node *np)
 	return disp;
 
 timingfail:
-	if (native_mode)
-		of_node_put(native_mode);
+	of_node_put(native_mode);
 	display_timings_release(disp);
 entryfail:
 	kfree(disp);

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