linux-kernel - Re: [PATCH v9] PM / Hibernate: use name_to_dev

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Date:	Sat, 15 Feb 2014 00:47:41 +0100
From:	Pavel Machek <pavel@....cz>
To:	Sebastian Capella <sebastian.capella@...aro.org>
Cc:	linux-kernel@...r.kernel.org, linux-pm@...r.kernel.org,
	linaro-kernel@...ts.linaro.org, Len Brown <len.brown@...el.com>,
	"Rafael J. Wysocki" <rjw@...ysocki.net>
Subject: Re: [PATCH v9] PM / Hibernate: use name_to_dev_t to parse resume

Hi!

> Use the name_to_dev_t call to parse the device name echo'd to
> to /sys/power/resume.  This imitates the method used in hibernate.c
> in software_resume, and allows the resume partition to be specified
> using other equivalent device formats as well.  By allowing
> /sys/debug/resume to accept the same syntax as the resume=device
> parameter, we can parse the resume=device in the init script and
> use the resume device directly from the kernel command line.
> 
> Signed-off-by: Sebastian Capella <sebastian.capella@...aro.org>
> Cc: Len Brown <len.brown@...el.com>
> Cc: Pavel Machek <pavel@....cz>
> Cc: "Rafael J. Wysocki" <rjw@...ysocki.net>

Acked-by: Pavel Machek <pavel@....cz>

> @@ -972,16 +972,20 @@ static ssize_t resume_show(struct kobject *kobj, struct kobj_attribute *attr,
>  static ssize_t resume_store(struct kobject *kobj, struct kobj_attribute *attr,
>  			    const char *buf, size_t n)
>  {
> -	unsigned int maj, min;
>  	dev_t res;
> -	int ret = -EINVAL;
> +	int len = n;
> +	char *name;
>  
> -	if (sscanf(buf, "%u:%u", &maj, &min) != 2)
> -		goto out;
> +	if (len && buf[len-1] == '\n')
> +		len--;
> +	name = kstrndup(buf, len, GFP_KERNEL);
> +	if (!name)
> +		return -ENOMEM;

And yes, it seems to do right thing even if "\n" is passed to it.

> -	res = MKDEV(maj,min);
> -	if (maj != MAJOR(res) || min != MINOR(res))
> -		goto out;
> +	res = name_to_dev_t(name);
> +	kfree(name);

-- 
(english) http://www.livejournal.com/~pavelmachek
(cesky, pictures) http://atrey.karlin.mff.cuni.cz/~pavel/picture/horses/blog.html
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