linux-kernel - Re: [PATCH v9 2/3] mmc: core: add random fault injection

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Message-ID: <CAJ0pr18JwZFL64_rKYmMUpS8J38w=v+yR96Aeh15et42bfdY4Q@mail.gmail.com>
Date:	Wed, 14 Sep 2011 10:29:03 +0200
From:	Per Forlin <per.forlin@...aro.org>
To:	Akinobu Mita <akinobu.mita@...il.com>
Cc:	linux-mmc@...r.kernel.org, linux-kernel@...r.kernel.org,
	linaro-dev@...ts.linaro.org,
	Linus Walleij <linus.walleij@...aro.org>,
	Chris Ball <cjb@...top.org>, linux-doc@...r.kernel.org
Subject: Re: [PATCH v9 2/3] mmc: core: add random fault injection

On 14 September 2011 10:04, Akinobu Mita <akinobu.mita@...il.com> wrote:
> 2011/9/14 Per Forlin <per.forlin@...aro.org>:
>
>> It's simple and the patch would be just two lines.
>> The reason for changing my mind is that it may be useful to be able to
>> pass the fault injection attributes even when mmc_core is a module.
>>
>>> module_param is more complicated than this. Also the parameter is only
>>> usefull when when mmc_core is built into the kernel (it's useless when
>>> mmc_core is built as a module).
>>>
>> If you want to enable fault injection for the mmc_core module at load
>> time (during mmc initialisation) the param must be used.
>> modprobe mmc_core fail_request=1,1,1,1
>> As soon as the module is loaded there is no need for the module param anymore.
>
> OK, I agree with you.  The module parameter is the only way
> to enable mmc fault injection if CONFIG_FAULT_INJECTION_DEBUG_FS
> is disabled.
>
This is true as well. My point is that if using
CONFIG_FAULT_INJECTION_DEBUG_FS the fault attributes can't be set
until after the mmc module initialisation. One may want to test the
error handling during the mmc initialisation.
I'll send out a version v2 using module_param_cb().

Thanks again,
Per
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