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Date: Fri, 13 Jan 2012 07:32:12 +0100 (CET)
From: Julia Lawall <julia.lawall@lip6.fr>
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To: Dong Aisheng-B29396 <B29396@freescale.com>
cc: Julia Lawall <Julia.Lawall@lip6.fr>, Liam Girdwood <lrg@ti.com>,
        "kernel-janitors@vger.kernel.org" <kernel-janitors@vger.kernel.org>,
        Mark Brown <broonie@opensource.wolfsonmicro.com>,
        Jaroslav Kysela <perex@perex.cz>, Takashi Iwai <tiwai@suse.de>,
        "alsa-devel@alsa-project.org" <alsa-devel@alsa-project.org>,
        "linux-kernel@vger.kernel.org" <linux-kernel@vger.kernel.org>
Subject: RE: [PATCH 1/15] sound/soc/mxs/mxs-saif.c: add missing iounmap
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On Fri, 13 Jan 2012, Dong Aisheng-B29396 wrote:

>> -----Original Message-----
>> From: linux-kernel-owner@vger.kernel.org [mailto:linux-kernel-
>> owner@vger.kernel.org] On Behalf Of Julia Lawall
>> Sent: Thursday, January 12, 2012 5:55 PM
>> To: Liam Girdwood
>> Cc: kernel-janitors@vger.kernel.org; Mark Brown; Jaroslav Kysela; Takashi Iwai;
>> alsa-devel@alsa-project.org; linux-kernel@vger.kernel.org
>> Subject: [PATCH 1/15] sound/soc/mxs/mxs-saif.c: add missing iounmap
>>
>> From: Julia Lawall <Julia.Lawall@lip6.fr>
>>
>> Add missing iounmap in error handling code, in a case where the function already
>> preforms iounmap on some other execution path.
>>
>> A simplified version of the semantic match that finds this problem is as
>> follows: (http://coccinelle.lip6.fr/)
>>
>> // <smpl>
>> @@
>> expression e;
>> statement S,S1;
>> int ret;
>> @@
>> e = \(ioremap\|ioremap_nocache\)(...)
>> ... when != iounmap(e)
>> if (<+...e...+>) S
>> ... when any
>>     when != iounmap(e)
>> *if (...)
>>    { ... when != iounmap(e)
>>      return ...; }
>> ... when any
>> iounmap(e);
>> // </smpl>
>>
>> Signed-off-by: Julia Lawall <Julia.Lawall@lip6.fr>
>>
>> ---
>>  sound/soc/mxs/mxs-saif.c |    3 ++-
>>  1 file changed, 2 insertions(+), 1 deletion(-)
>>
>> diff --git a/sound/soc/mxs/mxs-saif.c b/sound/soc/mxs/mxs-saif.c index
>> 049e543..5ee0adb 100644
>> --- a/sound/soc/mxs/mxs-saif.c
>> +++ b/sound/soc/mxs/mxs-saif.c
>> @@ -680,7 +680,7 @@ static int mxs_saif_probe(struct platform_device *pdev)
>>  		ret = -ENODEV;
>>  		dev_err(&pdev->dev, "failed to get dma resource: %d\n",
>>  			ret);
>> -		goto failed_ioremap;
>> +		goto failed_get_resource;
>>  	}
>>  	saif->dma_param.chan_num = dmares->start;
>>
>> @@ -739,6 +739,7 @@ failed_register:
>>  failed_get_irq2:
>>  	free_irq(saif->irq, saif);
>>  failed_get_irq1:
>> +failed_get_resource:
> There's already a 'failed_get_resource' there, wouldn't your change break
> The original code?
>
> BTW, I guess a better way is that you can submit a patch to change the driver
> To use devm_alloc_* and it's friend routines, then we do not need to fix
> Such things any more.

Thanks for the suggestions.  I will fix it up with the devm_ solution.

julia