linux-kernel - Re: Linux v2.6.22-rc3

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Date:	Mon, 28 May 2007 17:50:14 -0400
From:	Bill Davidsen <davidsen@....com>
To:	Jeff Garzik <jgarzik@...ox.com>
CC:	Gregor Jasny <gjasny@...glemail.com>,
	Linux Kernel Mailing List <linux-kernel@...r.kernel.org>,
	Linus Torvalds <torvalds@...ux-foundation.org>,
	linux-ide@...r.kernel.org, Alan Cox <alan@...rguk.ukuu.org.uk>
Subject: Re: Linux v2.6.22-rc3

Jeff Garzik wrote:

> Several people have reported LITE-ON LTR-48246S detection failed
> because SETXFER fails.  It seems the device raises IRQ too early after
> SETXFER.  This is controller independent.  The same problem has been
> reported for different controllers.
> 
> So, now we have pata_via where the controller raises IRQ before it's
> ready after SETXFER and a device which does similar thing.  This patch
> makes libata always execute SETXFER via polling.  As this only happens
> during EH, performance impact is nil.  Setting ATA_TFLAG_POLLING is
> also moved from issue hot path to ata_dev_set_xfermode() - the only
> place where SETXFER can be issued.
> 
> Note that ATA_TFLAG_POLLING applies only to drivers which implement
> SFF TF interface and use libata HSM.  More advanced controllers ignore
> the flag.  This doesn't matter for this fix as SFF TF controllers are
> the problematic ones.
> 
Not only kills two birds with a single store, but will avoid having to 
re-solve the problem at sometime in the future. That's good software!

-- 
Bill Davidsen <davidsen@....com>
   "We have more to fear from the bungling of the incompetent than from
the machinations of the wicked."  - from Slashdot
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