linux-kernel - Re: [PATCH 1/1] MIPS: APRP: Fix an issue when device

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Date:	Fri, 20 Jun 2014 15:15:33 -0400
From:	Sebastien Bourdelin <sebastien.bourdelin@...oirfairelinux.com>
To:	Deng-Cheng Zhu <dengcheng.zhu@...tec.com>,
	linux-mips@...ux-mips.org, Ralf Baechle <ralf@...ux-mips.org>,
	"Steven J. Hill" <Steven.Hill@...tec.com>,
	John Crispin <blogic@...nwrt.org>,
	Qais Yousef <Qais.Yousef@...tec.com>
CC:	linux-kernel@...r.kernel.org,
	Jerome Oufella <jerome.oufella@...oirfairelinux.com>
Subject: Re: [PATCH 1/1] MIPS: APRP: Fix an issue when device_create() fails.

Hi,

correct me if i'm wrong, but if we pre-decrement, it will decrement
before evaluate and the channel 0 will never be destroy.
So the while condition must change too accordingly.
In any case inside the while loop, "i" will be "i - 1" so we destroy the
previously device.
I think it's correct like this.

On 06/20/2014 01:32 PM, Deng-Cheng Zhu wrote:
> On 06/19/2014 01:30 PM, Sebastien Bourdelin wrote:
>> If a call to device_create() fails for a channel during the initialize
>> loop, we need to clean the devices entries already created before
>> leaving.
>>
>> Signed-off-by: Sebastien Bourdelin <sebastien.bourdelin@...oirfairelinux.com>
>> ---
>>   arch/mips/kernel/rtlx-cmp.c | 3 +++
>>   arch/mips/kernel/rtlx-mt.c  | 3 +++
>>   2 files changed, 6 insertions(+)
>>
>> diff --git a/arch/mips/kernel/rtlx-cmp.c b/arch/mips/kernel/rtlx-cmp.c
>> index 758fb3c..d26dcc4 100644
>> --- a/arch/mips/kernel/rtlx-cmp.c
>> +++ b/arch/mips/kernel/rtlx-cmp.c
>> @@ -77,6 +77,9 @@ int __init rtlx_module_init(void)
>>   		dev = device_create(mt_class, NULL, MKDEV(major, i), NULL,
>>   				    "%s%d", RTLX_MODULE_NAME, i);
>>   		if (IS_ERR(dev)) {
>> +			while (i--)
> --i?
>
>> +				device_destroy(mt_class, MKDEV(major, i));
>> +
>>   			err = PTR_ERR(dev);
>>   			goto out_chrdev;
>>   		}
>> diff --git a/arch/mips/kernel/rtlx-mt.c b/arch/mips/kernel/rtlx-mt.c
>> index 5a66b97..cb95470 100644
>> --- a/arch/mips/kernel/rtlx-mt.c
>> +++ b/arch/mips/kernel/rtlx-mt.c
>> @@ -103,6 +103,9 @@ int __init rtlx_module_init(void)
>>   		dev = device_create(mt_class, NULL, MKDEV(major, i), NULL,
>>   				    "%s%d", RTLX_MODULE_NAME, i);
>>   		if (IS_ERR(dev)) {
>> +			while (i--)
> Same here.
>
>> +				device_destroy(mt_class, MKDEV(major, i));
>> +
>>   			err = PTR_ERR(dev);
>>   			goto out_chrdev;
>>   		}
>
>
> Deng-Cheng
>
> --
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