linux-kernel - Re: [PATCH] Re: Linux v2.6.22-rc3

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Message-ID: <20070608143136.GC25649@havoc.gtf.org>
Date:	Fri, 8 Jun 2007 10:31:36 -0400
From:	Jeff Garzik <jeff@...zik.org>
To:	Tejun Heo <htejun@...il.com>
Cc:	Linus Torvalds <torvalds@...ux-foundation.org>,
	Gregor Jasny <gjasny@...glemail.com>,
	Linux Kernel Mailing List <linux-kernel@...r.kernel.org>,
	linux-ide@...r.kernel.org, Alan Cox <alan@...rguk.ukuu.org.uk>,
	Andrew Morton <akpm@...ux-foundation.org>
Subject: Re: [PATCH] Re: Linux v2.6.22-rc3

On Fri, Jun 08, 2007 at 05:02:24PM +0900, Tejun Heo wrote:
> I don't think the first one is probable considering BSY is supposed to
> set when SRST is received.  This is pretty fundamental in the protocol
> and necessary for the device to work properly as master, so I think this
> is one of few things we can rely upon.

See a URL I posted earlier in this thread.  With dumb ATAPI devices we
actually have to wait a bit for BSY to be asserted.  Not only at reset,
but also for every command.

> How about limiting nsect/lbal wait duration?  Say, 100ms or 500ms?  That
> can somewhat ease our paranoia and should show acceptable behavior for
> braindead devices too.

That's quite reasonable.

	Jeff

P.S.  We can probably reduce the msleep(150) sprinkled about the code to
msleep(100), for the dumb-ATAPI-device wait.
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