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

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Date:	Thu, 29 Jan 2015 11:27:16 +0100
From:	Ulf Hansson <ulf.hansson@...aro.org>
To:	Jisheng Zhang <jszhang@...vell.com>
Cc:	Chris Ball <chris@...ntf.net>,
	Sebastian Hesselbarth <sebastian.hesselbarth@...il.com>,
	Thomas Petazzoni <thomas.petazzoni@...e-electrons.com>,
	linux-mmc <linux-mmc@...r.kernel.org>,
	"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
	"linux-arm-kernel@...ts.infradead.org" 
	<linux-arm-kernel@...ts.infradead.org>, stable@...r.kernel.org
Subject: Re: [PATCH] mmc: sdhci-pxav3: fix setting of pdata->clk_delay_cycles

On 28 January 2015 at 12:54, Jisheng Zhang <jszhang@...vell.com> wrote:
> 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+

Thanks! Applied for next.

Kind regards
Uffe

> ---
>  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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