linux-kernel - Re: [STABLE PATCH .26 .27] ACPI: avoid empty file name in sysfs

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Message-ID: <20081115171725.GB1523@ucw.cz>
Date:	Sat, 15 Nov 2008 18:17:25 +0100
From:	Pavel Machek <pavel@...e.cz>
To:	Len Brown <lenb@...nel.org>
Cc:	stable@...nel.org, linux-acpi@...r.kernel.org,
	Linux Kernel Mailing List <linux-kernel@...r.kernel.org>
Subject: Re: [STABLE PATCH .26 .27] ACPI: avoid empty file name in sysfs

Hi!

> upstream 4feba70a2c1a1a0c96909f657f48b2e11e682370
> 
> Since commit bc45b1d39a925b56796bebf8a397a0491489d85c acpi tables are
> allowed to have an empty signature and /sys/firmware/acpi/tables uses the
> signature as filename.  Applications using naive recursion through /sys
> loop forever.  A possible solution would be: (replacing the zero length
> filename with the string "NULL")

What about using some string that is not a valid table name? Shorter
than 4 characters? AFAICT,
'NULL' table could be added to acpi in future...?

What if *two* tales have empty signature?
-- 
(english) http://www.livejournal.com/~pavelmachek
(cesky, pictures) http://atrey.karlin.mff.cuni.cz/~pavel/picture/horses/blog.html
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