linux-kernel - [PATCH] sound/soc/fsl/fsl_dma.c: add missing of_node

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Date:	Sat, 20 Aug 2011 09:23:45 +0200
From:	Julia Lawall <julia@...u.dk>
To:	Timur Tabi <timur@...escale.com>
Cc:	kernel-janitors@...r.kernel.org, Liam Girdwood <lrg@...com>,
	Mark Brown <broonie@...nsource.wolfsonmicro.com>,
	Jaroslav Kysela <perex@...ex.cz>, Takashi Iwai <tiwai@...e.de>,
	Grant Likely <grant.likely@...retlab.ca>,
	alsa-devel@...a-project.org, linuxppc-dev@...ts.ozlabs.org,
	linux-kernel@...r.kernel.org, devicetree-discuss@...ts.ozlabs.org
Subject: [PATCH] sound/soc/fsl/fsl_dma.c: add missing of_node_put

From: Julia Lawall <julia@...u.dk>

of_parse_phandle increments the reference count of np, so this should be
decremented before trying the next possibility.

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

// <smpl>
@@
expression e,e1,e2;
@@

*e = of_parse_phandle(...)
... when != of_node_put(e)
    when != true e == NULL
    when != e2 = e
e = e1
// </smpl>

Signed-off-by: Julia Lawall <julia@...u.dk>

---
 sound/soc/fsl/fsl_dma.c |    2 ++
 1 file changed, 2 insertions(+)

diff --git a/sound/soc/fsl/fsl_dma.c b/sound/soc/fsl/fsl_dma.c
index 0efc04a..b33271b 100644
--- a/sound/soc/fsl/fsl_dma.c
+++ b/sound/soc/fsl/fsl_dma.c
@@ -880,10 +880,12 @@ static struct device_node *find_ssi_node(struct device_node *dma_channel_np)
 		np = of_parse_phandle(ssi_np, "fsl,playback-dma", 0);
 		if (np == dma_channel_np)
 			return ssi_np;
+		of_node_put(np);
 
 		np = of_parse_phandle(ssi_np, "fsl,capture-dma", 0);
 		if (np == dma_channel_np)
 			return ssi_np;
+		of_node_put(np);
 	}
 
 	return NULL;

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