From mboxrd@z Thu Jan  1 00:00:00 1970
From: Mark Brown <broonie@opensource.wolfsonmicro.com>
Subject: Re: [PATCH] ASoC: Ensure we generate a card name
Date: Tue, 20 Sep 2011 12:03:56 +0100
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To: Takashi Iwai <tiwai@suse.de>
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On Tue, Sep 20, 2011 at 12:58:11PM +0200, Takashi Iwai wrote:

> Better to replace any letter except [a-zA-Z0-9_] with '_' or drop
> them.  Use isalnum(), for example.

What *are* the rules?  The documentation says "driver name" which isn't
verbose...