linux-kernel - Re: [GIT]: IDE

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Message-Id: <200911091135.09051.bzolnier@gmail.com>
Date:	Mon, 9 Nov 2009 11:35:08 +0100
From:	Bartlomiej Zolnierkiewicz <bzolnier@...il.com>
To:	David Miller <davem@...emloft.net>
Cc:	torvalds@...ux-foundation.org, akpm@...ux-foundation.org,
	linux-ide@...r.kernel.org, linux-kernel@...r.kernel.org
Subject: Re: [GIT]: IDE

On Monday 09 November 2009 06:30:55 David Miller wrote:
> 
> The revert we thought we didn't need, we really do need still, even
> with Bart Z.'s fix.
> 
> The issue is that we are doing these PIO setting calls before we did
> the device probe and therefore we don't yet know the media type.
> 
> Yet the ->set_pio_mode() of some drivers key off of the media type to
> determine whether to turn prefetching etc. on so it can't possibly
> work properly.

Thanks for quick reaction to the revert request.

If somebody is interested in the proper way to fix it you just need to
add ide_unknown media type and set it before probe instead of ide_disk
one.  Then audit ->set_pio_mode implementations for potential gotchas.

[ However it is too late for -rc and nobody is currently working on
  IDE fixes anyway so I just requested the revert . ]

-- 
Bartlomiej Zolnierkiewicz
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