linux-kernel - Re: [PATCH] devfreq: fix double call put

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Date:	Wed, 1 Jun 2016 20:31:34 +0900
From:	Chanwoo Choi <cwchoi00@...il.com>
To:	Chanwoo Choi <cw00.choi@...sung.com>
Cc:	Caizhiyong <caizhiyong@...ilicon.com>,
	Andrew Morton <akpm@...ux-foundation.org>,
	"linux-pm@...r.kernel.org" <linux-pm@...r.kernel.org>,
	"kyungmin.park@...sung.com" <kyungmin.park@...sung.com>,
	"myungjoo.ham@...sung.com" <myungjoo.ham@...sung.com>,
	lkml <linux-kernel@...r.kernel.org>,
	"Wanli (welly)" <welly.wan@...ilicon.com>,
	"Wangming (Wonder)" <mingwonder.wang@...ilicon.com>,
	Quyaxin <quyaxin@...ilicon.com>
Subject: Re: [PATCH] devfreq: fix double call put_device

Dear Myungjoo,

I reivewed this patch. But the merged patch[1] don't include the my
reviewed-by tag.

[1] https://git.kernel.org/cgit/linux/kernel/git/mzx/devfreq.git/commit/?h=fixes&id=d90ea94c8f33dcda631885a3dbb2df063ba39efd

Regards,
Chanwoo Choi

On Wed, May 18, 2016 at 8:07 PM, Chanwoo Choi <cw00.choi@...sung.com> wrote:
> Hi Cai,
>
> On 2016년 05월 14일 15:28, Caizhiyong wrote:
>> From: Cai Zhiyong <caizhiyong@...wei.com>
>> Date: Sat, 14 May 2016 14:13:30 +0800
>> Subject: [PATCH] devfreq: fix double call put_device
>
> The patch description don't need to include the 'Date/Subject'.
> You need to delete them.
>
>>
>> 1295  */
>> 1296 void device_unregister(struct device *dev)
>> 1297 {
>> 1298         pr_debug("device: '%s': %s\n", dev_name(dev), __func__);
>> 1299         device_del(dev);
>> 1300         put_device(dev);
>> 1301 }
>> 1302 EXPORT_SYMBOL_GPL(device_unregister);
>> 1303
>
> Also, you don't need to include the source code of device_unregister()
> because below description explains the why this patch is needed.
>
>>
>> device_unregister is called put_device, there is no need to call
>> put_device(&devfreq->dev) again.
>>
>> Signed-off-by: Cai Zhiyong <caizhiyong@...wei.com>
>> ---
>>  drivers/devfreq/devfreq.c |    1 -
>>  1 file changed, 1 deletion(-)
>>
>> diff --git a/drivers/devfreq/devfreq.c b/drivers/devfreq/devfreq.c
>> index 1d6c803..8de22c0 100644
>> --- a/drivers/devfreq/devfreq.c
>> +++ b/drivers/devfreq/devfreq.c
>> @@ -621,7 +621,6 @@ int devfreq_remove_device(struct devfreq *devfreq)
>>               return -EINVAL;
>>
>>       device_unregister(&devfreq->dev);
>> -     put_device(&devfreq->dev);
>>
>>       return 0;
>>  }
>>
>
> If you modify the patch description, Looks good to me.
>
> Reviewed-by: Chanwoo Choi <cw00.choi@...sung.com>
>
> Thanks,
> Chanwoo Choi