linux-kernel - Re: [PATCH RESEND] ARM: pxa: fix error handling in pxa2xx_drv_pcmcia

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Date:	Wed, 28 Dec 2011 09:04:07 +0800
From:	Haojian Zhuang <haojian.zhuang@...il.com>
To:	Eric Miao <eric.y.miao@...il.com>
Cc:	Haojian Zhuang <hzhuang1@...vell.com>,
	Axel Lin <axel.lin@...il.com>,
	"linux-pcmcia@...ts.infradead.org" <linux-pcmcia@...ts.infradead.org>,
	Russell King <linux@....linux.org.uk>,
	"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
	"linux-arm-kernel@...ts.infradead.org" 
	<linux-arm-kernel@...ts.infradead.org>
Subject: Re: [PATCH RESEND] ARM: pxa: fix error handling in pxa2xx_drv_pcmcia_probe

On Tue, Dec 27, 2011 at 5:25 PM, Eric Miao <eric.y.miao@...il.com> wrote:
> On Tue, Dec 27, 2011 at 5:18 PM, Haojian Zhuang <hzhuang1@...vell.com> wrote:
>>
>> ________________________________________
>> From: Eric Miao [eric.y.miao@...il.com]
>> Sent: Tuesday, December 27, 2011 5:11 PM
>> To: Axel Lin
>> Cc: linux-kernel@...r.kernel.org; Haojian Zhuang; Russell King; linux-arm-kernel@...ts.infradead.org; linux-pcmcia@...ts.infradead.org
>> Subject: Re: [PATCH RESEND] ARM: pxa: fix error handling in pxa2xx_drv_pcmcia_probe
>>
>> On Tue, Dec 27, 2011 at 4:25 PM, Axel Lin <axel.lin@...il.com> wrote:
>>> If pxa2xx_drv_pcmcia_add_one fails, it will go to err1 error path.
>>> Add a missing clk_put in the error path.
>>>
>>> Checking the ret value after the for loop is redundant, it is always false.
>>> Thus remove the redundant checking.
>>>
>>> Signed-off-by: Axel Lin <axel.lin@...il.com>
>>
>> Acked-by: Eric Miao <eric.y.miao@...il.com>
>>
>>> ---
>>>  drivers/pcmcia/pxa2xx_base.c |   12 +++---------
>>>  1 files changed, 3 insertions(+), 9 deletions(-)
>>>
>>> diff --git a/drivers/pcmcia/pxa2xx_base.c b/drivers/pcmcia/pxa2xx_base.c
>>> index a87e272..64d433e 100644
>>> --- a/drivers/pcmcia/pxa2xx_base.c
>>> +++ b/drivers/pcmcia/pxa2xx_base.c
>>> @@ -328,21 +328,15 @@ static int pxa2xx_drv_pcmcia_probe(struct platform_device *dev)
>>>                        goto err1;
>>>        }
>>>
>>> -       if (ret) {
>>> -               while (--i >= 0)
>>> -                       soc_pcmcia_remove_one(&sinfo->skt[i]);
>>> -               kfree(sinfo);
>>> -               clk_put(clk);
>>> -       } else {
>>> -               pxa2xx_configure_sockets(&dev->dev);
>>> -               dev_set_drvdata(&dev->dev, sinfo);
>>> -       }
>>> +       pxa2xx_configure_sockets(&dev->dev);
>>> +       dev_set_drvdata(&dev->dev, sinfo);
>>>
>>>        return 0;
>>>
>>>  err1:
>>>        while (--i >= 0)
>>>                soc_pcmcia_remove_one(&sinfo->skt[i]);
>>> +       clk_put(clk);
>>>        kfree(sinfo);
>>>  err0:
>>>        return ret;
>>> --
>>> 1.7.5.4
>>>
>>>
>>>
>> Wait a minute.
>>
>> The original code will check whether pxa2xx_drv_pcmcia_add_one() successful. If it fails, we'll remove all devices that we registered.
>>
>> But Axel removed these code. Why?
>
> If it fails, it will jump to err1 anyway. The check there is redundant.
>
Applied
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