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From: Tejun Heo <htejun@gmail.com>
To: Alan Cox <alan@lxorguk.ukuu.org.uk>
Cc: Jeff Garzik <jeff@garzik.org>,
	Linux IDE mailing list <linux-ide@vger.kernel.org>,
	LKML <linux-kernel@vger.kernel.org>,
	Bartlomiej Zolnierkiewicz <bzolnier@gmail.com>
Subject: Re: devres and requesting resources
Date: Fri, 29 Feb 2008 23:17:58 +0900	[thread overview]
Message-ID: <47C81416.1010305@gmail.com> (raw)
In-Reply-To: <20080229140106.41ccc843@core>

Alan Cox wrote:
>> controller like ICH AHCIs.  ata_generic or ide generic might attach to a
>> controller which is already being driven by ahci under certain
>> configurations.
> 
> ata_generic will not nor ata_legacy both are much too smart for that. The
> legacy old IDE driver might but that probably isn't going to be fixed by
> devres and is trivial to fix in that driver (just steal the code from
> pata_legacy).

Yeah, I saw the behavior with ahci + ide generic combination.  I think
it was on SB600.  Heh... neat trick in pata_legacy().  Hmm... it's
probably better to do at generic device level and with a generic helper.

>> have different requirements can just open code pci_request_regions() and
>> pcim_iomap().  pcim_request_regions() should provide sensible default
>> behavior for common cases.
> 
> Which is arguably the current behaviour. Changing the behaviour and not
> the name is a really bad idea and will cause problems in future so don't
> do that.
>> I think the best solution is to allow duplicate request regions for
>> managed devices which is okay as we know we're holding the resource and
>> let drivers which need to reserve all regions call pci_request_regions()
>> before calling pcim_request_regions().
> 
> How about
> 
> 	pcim_request_all_regions()
> 
> for the behaviour Jeff wants, simple, direct, differently named and
> obvious what it does.

Sounds good to me.  Jeff?

-- 
tejun

  reply	other threads:[~2008-02-29 14:18 UTC|newest]

Thread overview: 10+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2008-02-29  0:36 Jeff Garzik
2008-02-29 11:26 ` Alan Cox
2008-02-29 12:11   ` Jeff Garzik
2008-02-29 12:28     ` Tejun Heo
2008-02-29 14:01       ` Alan Cox
2008-02-29 14:17         ` Tejun Heo [this message]
2008-02-29 19:25           ` Jeff Garzik
2008-02-29 17:04         ` Bartlomiej Zolnierkiewicz
2008-02-29 17:04           ` Alan Cox
2008-02-29 13:55     ` Alan Cox

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