linux-kernel - Re: [PATCH] clk: sunxi: fix devm_ioremap

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Date:	Sat, 28 Jun 2014 18:38:26 -0300
From:	Emilio López <emilio@...pez.com.ar>
To:	Boris BREZILLON <boris.brezillon@...e-electrons.com>,
	Himangi Saraogi <himangi774@...il.com>,
	Mike Turquette <mturquette@...aro.org>
CC:	Maxime Ripard <maxime.ripard@...e-electrons.com>,
	linux-kernel@...r.kernel.org, linux-arm-kernel@...ts.infradead.org,
	julia.lawall@...6.fr
Subject: Re: [PATCH] clk: sunxi: fix devm_ioremap_resource error detection
 code

Hi,

El 28/06/14 14:58, Boris BREZILLON escribió:
> Hello,
>
> On 28/06/2014 19:23, Himangi Saraogi wrote:
>> devm_ioremap_resource returns an ERR_PTR value, not NULL, on failure.
>>
>> A simplified version of the semantic match that finds this problem is as
>> follows:
>>
>> // <smpl>
>> @@
>> expression e,e1;
>> statement S;
>> @@
>>
>> *e = devm_ioremap_resource(...);
>> if (!e1) S
>>
>> // </smpl>
>> Signed-off-by: Himangi Saraogi<himangi774@...il.com>
>> Acked-by: Julia Lawall<julia.lawall@...6.fr>
>> ---
>>   drivers/clk/sunxi/clk-sun6i-apb0-gates.c | 2 +-
>>   1 file changed, 1 insertion(+), 1 deletion(-)
>>
>> diff --git a/drivers/clk/sunxi/clk-sun6i-apb0-gates.c b/drivers/clk/sunxi/clk-sun6i-apb0-gates.c
>> index 44cd27c..670f90d 100644
>> --- a/drivers/clk/sunxi/clk-sun6i-apb0-gates.c
>> +++ b/drivers/clk/sunxi/clk-sun6i-apb0-gates.c
>> @@ -29,7 +29,7 @@ static int sun6i_a31_apb0_gates_clk_probe(struct platform_device *pdev)
>>
>>   	r = platform_get_resource(pdev, IORESOURCE_MEM, 0);
>>   	reg = devm_ioremap_resource(&pdev->dev, r);
>> -	if (!reg)
>> +	if (IS_ERR(reg))
>>   		return PTR_ERR(reg);
>>
>>   	clk_parent = of_clk_get_parent_name(np, 0);
>
> Oops, one more mistake in testing devm_ioremap_resource return code (I
> always mix devm_ioremap_resource and devm_request_and_ioremap behaviours).
>
> Sorry for the inconvenience, and of course, you have my:
>
> Acked-by Boris BREZILLON <boris.brezillon@...e-electrons.com>

Mike, do you want to take this directly for the -rc cycle, or should I 
queue it for 3.17? Please let me know.

Cheers,

Emilio
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