linux-kernel - [PATCH] mmc: sdhci-pxav3: fix setting of pdata->clk_delay

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Message-ID: <1422446052-2323-1-git-send-email-jszhang@marvell.com>
Date:	Wed, 28 Jan 2015 19:54:12 +0800
From:	Jisheng Zhang <jszhang@...vell.com>
To:	<chris@...ntf.net>, <ulf.hansson@...aro.org>,
	<sebastian.hesselbarth@...il.com>
CC:	<thomas.petazzoni@...e-electrons.com>, <linux-mmc@...r.kernel.org>,
	<linux-kernel@...r.kernel.org>,
	<linux-arm-kernel@...ts.infradead.org>,
	Jisheng Zhang <jszhang@...vell.com>, <stable@...r.kernel.org>
Subject: [PATCH] mmc: sdhci-pxav3: fix setting of pdata->clk_delay_cycles

Current code checks "clk_delay_cycles > 0" to know whether the optional
"mrvl,clk_delay_cycles" is set or not. But of_property_read_u32() doesn't
touch clk_delay_cycles if the property is not set. And type of
clk_delay_cycles is u32, so we may always set pdata->clk_delay_cycles as a
random value.

This patch fix this problem by check the return value of of_property_read_u32()
to know whether the optional clk-delay-cycles is set or not.

Signed-off-by: Jisheng Zhang <jszhang@...vell.com>
Cc: <stable@...r.kernel.org> # v3.6+
---
 drivers/mmc/host/sdhci-pxav3.c | 4 ++--
 1 file changed, 2 insertions(+), 2 deletions(-)

diff --git a/drivers/mmc/host/sdhci-pxav3.c b/drivers/mmc/host/sdhci-pxav3.c
index c5db5d2..f1c6362 100644
--- a/drivers/mmc/host/sdhci-pxav3.c
+++ b/drivers/mmc/host/sdhci-pxav3.c
@@ -268,8 +268,8 @@ static struct sdhci_pxa_platdata *pxav3_get_mmc_pdata(struct device *dev)
 	if (!pdata)
 		return NULL;
 
-	of_property_read_u32(np, "mrvl,clk-delay-cycles", &clk_delay_cycles);
-	if (clk_delay_cycles > 0)
+	if (!of_property_read_u32(np, "mrvl,clk-delay-cycles",
+				  &clk_delay_cycles))
 		pdata->clk_delay_cycles = clk_delay_cycles;
 
 	return pdata;
-- 
2.1.4

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