linux-kernel - Re: [PATCH] amd74xx: workaround unreliable AltStatus register for nVidia controllers

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Date:	Sat, 22 Nov 2008 12:33:42 +0100
From:	Borislav Petkov <petkovbb@...glemail.com>
To:	Bartlomiej Zolnierkiewicz <bzolnier@...il.com>
Cc:	linux-ide@...r.kernel.org, linux-kernel@...r.kernel.org,
	Remy LABENE <remy.labene@...e.fr>
Subject: Re: [PATCH] amd74xx: workaround unreliable AltStatus register for
	nVidia controllers

On Fri, Nov 21, 2008 at 10:38:50PM +0100, Bartlomiej Zolnierkiewicz wrote:
> It seems that on some nVidia controllers using AltStatus register
> can be unreliable so default to Status register if the PCI device
> is in Compatibility Mode.  In order to achieve this:
> 
> * Add ide_pci_is_in_compatibility_mode() inline helper to <linux/ide.h>.
> 
> * Add IDE_HFLAG_BROKEN_ALTSTATUS host flag and set it in amd74xx host
>   driver for nVidia controllers in Compatibility Mode.
> 
> * Teach actual_try_to_identify() and drive_is_ready() about the new flag.
> 
> This fixes the regression caused by removal of CONFIG_IDEPCI_SHARE_IRQ
> config option in 2.6.25 and using AltStatus register unconditionally when
> available (kernel.org bug #11659).  [ Moreover for CONFIG_IDEPCI_SHARE_IRQ=y
> (which is what most distributions/people use) it never worked correctly. ]

Looks good.

Acked-by: Borislav Petkov <petkovbb@...il.com>

> 
> Thanks to Remy LABENE for help with debugging the problem.
> 
> More info at:
> http://bugzilla.kernel.org/show_bug.cgi?id=11659

Bugzilla entry can be closed now.

[.. ]

-- 
Regards/Gruss,
    Boris.
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