linux-kernel - Re: [PATCH v3 2/3] mmc: core: add random fault injection

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Message-ID: <CAJ0pr1_rL8rsEbDR-PL6fs9EzyGfUMbmeUjTGk=WspvrAkdy+g@mail.gmail.com>
Date:	Mon, 25 Jul 2011 21:19:21 +0200
From:	Per Forlin <per.forlin@...aro.org>
To:	Akinobu Mita <akinobu.mita@...il.com>
Cc:	linaro-dev@...ts.linaro.org,
	Nicolas Pitre <nicolas.pitre@...aro.org>,
	linux-arm-kernel@...ts.infradead.org, linux-kernel@...r.kernel.org,
	linux-mmc@...r.kernel.org, linux-doc@...r.kernel.org,
	Venkatraman S <svenkatr@...com>,
	Linus Walleij <linus.walleij@...aro.org>,
	Kyungmin Park <kyungmin.park@...sung.com>,
	Arnd Bergmann <arnd@...db.de>,
	Sourav Poddar <sourav.poddar@...com>,
	Chris Ball <cjb@...top.org>,
	J Freyensee <james_p_freyensee@...ux.intel.com>,
	Randy Dunlap <rdunlap@...otime.net>
Subject: Re: [PATCH v3 2/3] mmc: core: add random fault injection

On 25 July 2011 17:58, Akinobu Mita <akinobu.mita@...il.com> wrote:
> 2011/7/21 Per Forlin <per.forlin@...aro.org>:
>> This adds support to inject data errors after a completed host transfer.
>> The mmc core will return error even though the host transfer is successful.
>> This simple fault injection proved to be very useful to test the
>> non-blocking error handling in the mmc_blk_issue_rw_rq().
>> Random faults can also test how the host driver handles pre_req()
>> and post_req() in case of errors.
>
> Looks good to me.
>
Thanks,

>> @@ -82,6 +87,66 @@ static void mmc_flush_scheduled_work(void)
>>        flush_workqueue(workqueue);
>>  }
>>
>> +#ifdef CONFIG_FAIL_MMC_REQUEST
>> +
>> +static DECLARE_FAULT_ATTR(fail_mmc_request);
>
> I think the fail_attr should be defined for each mmc_host like make_it_fail
> in struct mmc_host and debugfs entries should also be created in a
> subdirectory of mmc host debugfs.
>
I looked at blk-core.c and used the same code here. Current code
creates the entry under the debugfs root. This means one fail_attr for
all hosts.
I agree, it's more clean to move the fail_attr to the
host-debugfs-entry which require the fail_attr to be stored same way
as make_it_fail.

> And I know that init_fault_attr_dentries() can only create a
> subdirectory in debugfs root directory.  But I have a patch which
> support for creating it in arbitrary directory.  Could you take a look
> at this? (Note that this patch is based on mmotm and not yet tested)
>
Thanks, I will check it out.

Regards,
Per
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