linux-kernel - Re: [PATCH 10/13] eeepc-laptop: compare proper return values in get

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Message-ID: <20140916214037.GB23674@gmail.com>
Date:	Tue, 16 Sep 2014 23:40:37 +0200
From:	Frans Klaver <fransklaver@...il.com>
To:	Darren Hart <dvhart@...radead.org>
Cc:	Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
	Corentin Chary <corentin.chary@...il.com>,
	Rafael Wysocki <rafael.j.wysocki@...el.com>,
	acpi4asus-user <acpi4asus-user@...ts.sourceforge.net>,
	platform-driver-x86 <platform-driver-x86@...r.kernel.org>,
	linux-kernel@...r.kernel.org,
	linux-acpi <linux-acpi@...r.kernel.org>,
	"H. Peter Anvin" <hpa@...ux.intel.com>
Subject: Re: [PATCH 10/13] eeepc-laptop: compare proper return values in
 get_cpufv

On Tue, Sep 16, 2014 at 02:27:15PM -0700, Darren Hart wrote:
> 
> - When reading and writing sysfs device attribute files, avoid dependency
>   on specific error codes wherever possible. This minimizes coupling to
>   the error handling implemementation within the kernel.
> 
>   In general, failures to read or write sysfs device attributes shall
>   propogate errors wherever possible. Common errors include, but are not
>   limited to:
> 
>   -EIO: The read or store operation is not supported, typically returned by
>         the sysfs system itself if the read or store pointer is NULL.
> 
>   -ENXIO: The read or store operation failed
> 
>   Error codes will not be changed without good reason, and should a change
>   to error codes result in user-space breakage, it will be fixed, or the
>   the offending change will be reverted.

sysfs-rules.txt is written for user space? In that case, reverting the
change is as much a fix as patching it.

> 
>   Userspace applications can, however, expect the format and contents of
>   the attribute files to remain consistent in the absence of a version
>   attribute change in the context of a given attributes.

...attribute.

That's it for the nit-picking.

Frans
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