linux-kernel - [patch] dma/shdma: move dereference below the NULL check

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Message-ID: <20100814090145.GW645@bicker>
Date:	Sat, 14 Aug 2010 11:01:45 +0200
From:	Dan Carpenter <error27@...il.com>
To:	Dan Williams <dan.j.williams@...el.com>
Cc:	Paul Mundt <lethal@...ux-sh.org>,
	Guennadi Liakhovetski <g.liakhovetski@....de>,
	Magnus Damm <damm@...nsource.se>,
	Linus Walleij <linus.walleij@...ricsson.com>,
	linux-kernel@...r.kernel.org, kernel-janitors@...r.kernel.org
Subject: [patch] dma/shdma: move dereference below the NULL check

"param" can be NULL here, so only dereference it after the check.

Signed-off-by: Dan Carpenter <error27@...il.com>

diff --git a/drivers/dma/shdma.c b/drivers/dma/shdma.c
index fb64cf3..eb6b54d 100644
--- a/drivers/dma/shdma.c
+++ b/drivers/dma/shdma.c
@@ -580,7 +580,6 @@ static struct dma_async_tx_descriptor *sh_dmae_prep_slave_sg(
 
 	sh_chan = to_sh_chan(chan);
 	param = chan->private;
-	slave_addr = param->config->addr;
 
 	/* Someone calling slave DMA on a public channel? */
 	if (!param || !sg_len) {
@@ -589,6 +588,8 @@ static struct dma_async_tx_descriptor *sh_dmae_prep_slave_sg(
 		return NULL;
 	}
 
+	slave_addr = param->config->addr;
+
 	/*
 	 * if (param != NULL), this is a successfully requested slave channel,
 	 * therefore param->config != NULL too.
--
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