linux-kernel - Re: [PATCH] libata: fix combined mode (was Re: Happy New Year (and v2.6.20-rc3 released))

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Message-ID: <459AE459.8030107@pobox.com>
Date:	Tue, 02 Jan 2007 18:01:45 -0500
From:	Jeff Garzik <jgarzik@...ox.com>
To:	Alan <alan@...rguk.ukuu.org.uk>
CC:	Linus Torvalds <torvalds@...l.org>,
	Alessandro Suardi <alessandro.suardi@...il.com>,
	Linux Kernel Mailing List <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH] libata: fix combined mode (was Re: Happy New Year (and
 v2.6.20-rc3 released))

Alan wrote:
>>> We use BAR5 on two devices in legacy mode. Both of those reserve all the
>>> other resources.
>> Translation:  You want to hand-wave away an obvious regression that YOU 
>> have created with your fix-to-a-fix.
> 
> It's not regressing anything.

False:

2.6.0 - 2.6.19:  libata guarantees that all PCI BARs are reserved to the 
libata driver.

2.6.20:  no guarantee that all PCI BARs are reserved to libata driver. 
Real-life ata_piix example already provided, where a PCI BAR is no 
longer reserved to the driver.

2.6.21 - infinity:  libata guarantees that all PCI BARs are reserved to 
the driver.

	Jeff


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