linux-kernel - Re: [PATCH] staging: vme: fix error return code in vme_user

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Date:	Wed, 15 May 2013 08:56:34 +0100
From:	Martyn Welch <martyn.welch@...com>
To:	Wei Yongjun <weiyj.lk@...il.com>
CC:	Dan Carpenter <dan.carpenter@...cle.com>, gmate.amit@...il.com,
	devel@...verdev.osuosl.org, manohar.vanga@...il.com,
	gregkh@...uxfoundation.org, linux-kernel@...r.kernel.org,
	yamanetoshi@...il.com, yongjun_wei@...ndmicro.com.cn,
	joe@...ches.com
Subject: Re: [PATCH] staging: vme: fix error return code in vme_user_probe()

On 14/05/13 15:19, Dan Carpenter wrote:
> On Tue, May 14, 2013 at 02:56:17PM +0100, Martyn Welch wrote:
>> On 13/05/13 09:51, Dan Carpenter wrote:
>>> On Mon, May 13, 2013 at 09:16:00AM +0100, Martyn Welch wrote:
>>>> On 13/05/13 07:05, Wei Yongjun wrote:
>>>>> From: Wei Yongjun <yongjun_wei@...ndmicro.com.cn>
>>>>>
>>>>> Fix to return -ENOMEM in the resource alloc error handling
>>>>> case instead of 0, as done elsewhere in this function.
>>>>>
>>>>
>>>> Hi Wei,
>>>>
>>>> Thanks for your patch. As this is resource allocation rather than memory
>>>> allocation that is failing, would -EAGAIN not make more sense than -ENOMEM?
>>>>
>>>
>>> ENOMEM is better.  EAGAIN is for when trylock() fails etc.  In other
>>> words we are not allowed to block and someone is using the lock we
>>> need.
>>>
>>
>> ENOMEM just doesn't seem to describe the error very well. This error will be
>> triggered if no free VME windows are available for the driver to use - there
>> are typically 8 master and 8 slave windows provided in hardware.
>>
>> How about EBUSY (Device or resource busy)?
> 
> EBUSY would work.
> 

Hi Wei,

Would you mind resubmitting your patch returning the error code EBUSY rather
than ENOMEM?

Martyn

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