linux-kernel - Re: [PATCH v4 2/3] mmc: core: add random fault injection

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Date:	Wed, 27 Jul 2011 08:17:18 +0900
From:	Akinobu Mita <akinobu.mita@...il.com>
To:	Per Forlin <per.forlin@...aro.org>
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 v4 2/3] mmc: core: add random fault injection

2011/7/27 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 but I have one question.

> @@ -304,6 +307,10 @@ struct mmc_host {
>
>        struct mmc_async_req    *areq;          /* active async req */
>
> +#ifdef CONFIG_FAIL_MMC_REQUEST
> +       u8                      make_it_fail;
> +       struct fault_attr       fail_mmc_request;
> +#endif
>        unsigned long           private[0] ____cacheline_aligned;
>  };

I think make_it_fail is not needed anymore because if fail_attr is
defined per-host then you can enable it by setting probability=0
or times=0 per-host.
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