linux-kernel - Re: [PATCH v2 2/3] mmc: add module param to set fault injection attributes

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Message-ID: <CAC5umyjAymZL7jA2VJq=aPBRnUDyUL6poTitLL6DBrk2SfZnug@mail.gmail.com>
Date:	Wed, 14 Sep 2011 20:47:24 +0900
From:	Akinobu Mita <akinobu.mita@...il.com>
To:	Per Forlin <per.forlin@...aro.org>
Cc:	linaro-dev@...ts.linaro.org,
	Linus Walleij <linus.walleij@...aro.org>,
	linux-mmc@...r.kernel.org, Chris Ball <cjb@...top.org>,
	Randy Dunlap <rdunlap@...otime.net>, linux-doc@...r.kernel.org,
	linux-kernel@...r.kernel.org
Subject: Re: [PATCH v2 2/3] mmc: add module param to set fault injection attributes

2011/9/14 Per Forlin <per.forlin@...aro.org>:

>>>> +static int fail_mmc_request_param_set(const char *val,
>>>> +                                     const struct kernel_param *kp)
>>>> +{
>>>> +       setup_fault_attr(&fail_default_attr, (char *) val);
> I am thinking of returning failure here if setup_fault_attr() fails.
> if (setup_fault_attr(&fail_default_attr, (char *) val) == 0)
>  return -EINVAL;

It's good idea and it also prevents from loading the module if invalid
parameter is specified.

> There will be a printk(KERN_WARNING "FAULT_INJECTION: failed to parse
> arguments) it setup() fails. Is it too harsh to return failure?

Yes.  I'll try to fix in the future.
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