linux-kernel - Re: recent IDE regression

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Message-Id: <200807261404.49947.bzolnier@gmail.com>
Date:	Sat, 26 Jul 2008 14:04:49 +0200
From:	Bartlomiej Zolnierkiewicz <bzolnier@...il.com>
To:	David Miller <davem@...emloft.net>
Cc:	harvey.harrison@...il.com, linux-ide@...nel.org,
	linux-kernel@...r.kernel.org, torvalds@...ux-foundation.org
Subject: Re: recent IDE regression

On Friday 25 July 2008, David Miller wrote:

[...]

> Something like this:
> 
> endian: Always evaluate arguments.
> 
> Changeset 7fa897b91a3ea0f16c2873b869d7a0eef05acff4
> ("ide: trivial sparse annotations") created an IDE bootup
> regression on big-endian systems.  In drivers/ide/ide-iops.c,
> function ide_fixstring() we now have the loop:
> 
> 		for (p = end ; p != s;)
> 			be16_to_cpus((u16 *)(p -= 2));
> 
> which will never terminate on big-endian because in such
> a configuration be16_to_cpus() evaluates to "do { } while (0)"
> 
> Therefore, always evaluate the arguments to nop endian transformation
> operations.
> 
> Signed-off-by: David S. Miller <davem@...emloft.net>

Thanks David.

PS We need more big-endian users testing linux-next (this particular patch
despite being trivial has been put there just-in-case for a week)
 
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