linux-kernel - Re: [PATCH 01/14] dell-laptop: extract SMBIOS-related code to a separate module

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Date:	Mon, 18 Jan 2016 11:34:32 +0100
From:	Michał Kępień <kernel@...pniu.pl>
To:	Pali Rohár <pali.rohar@...il.com>
Cc:	Darren Hart <dvhart@...radead.org>,
	Matthew Garrett <mjg59@...f.ucam.org>,
	Richard Purdie <rpurdie@...ys.net>,
	Jacek Anaszewski <j.anaszewski@...sung.com>,
	Alex Hung <alex.hung@...onical.com>,
	platform-driver-x86@...r.kernel.org, linux-leds@...r.kernel.org,
	linux-kernel@...r.kernel.org
Subject: Re: [PATCH 01/14] dell-laptop: extract SMBIOS-related code to a
 separate module

Hi Pali,

Thanks for taking a look.

> > +struct calling_interface_token {
> > +	u16 tokenID;
> > +	u16 location;
> > +	union {
> > +		u16 value;
> > +		u16 stringlength;
> > +	};
> > +};
> 
> After patch 12/14 you do not need to define this struct in header file.

dell_smbios_find_token() returns a struct calling_interface_token *,
which can then be dereferenced by the caller.  See patch 13.

> > +extern struct calling_interface_buffer *buffer;
> > +extern struct calling_interface_token *da_tokens;
> 
> Better hide this variable in dell-smbios.c code ...

Patch 12 makes da_tokens static, but I believe you were referring to
buffer.

> > +void clear_buffer(void);
> > +void get_buffer(void);
> > +void release_buffer(void);
> 
> ... and let those functions to get parameter to buffer.
> 
> E.g. get_buffer will return buffer and other two functions will take
> buffer parameter.

You're right.  My original approach looked tempting because it reduces
the amount of changes required in dell-laptop, but on second thought, it
_assumes_ that users of this API would play nicely with the SMBIOS
buffer while your way _enforces_ it.

I will prepare a v2 including this suggestion within the next couple of
days.

-- 
Best regards,
Michał Kępień