linux-kernel - Re: RESEND: [PATCH] libata-sff: Fix oops reported in kerneloops.org for pnp devices with no ctl

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Message-ID: <alpine.LFD.1.10.0805291102370.2958@woody.linux-foundation.org>
Date:	Thu, 29 May 2008 11:04:08 -0700 (PDT)
From:	Linus Torvalds <torvalds@...ux-foundation.org>
To:	Jeff Garzik <jeff@...zik.org>
cc:	Alan Cox <alan@...rguk.ukuu.org.uk>, linux-kernel@...r.kernel.org,
	linux-ide@...r.kernel.org
Subject: Re: RESEND: [PATCH] libata-sff: Fix oops reported in kerneloops.org
 for pnp devices with no ctl



On Thu, 29 May 2008, Jeff Garzik wrote:
> > 
> > It may be that you meant to make it an "else if" case, ie if there was no
> > IO-read, then you do a ndelay(400) as a last desperate case, but that's not
> > how your ata_sdd_sync() is actually written.
> 
> The double-ndelay is definitely wrong, but we do need one.  Technically it
> should -only- be a 400ns delay, but we also have a register read in there to
> make sure any posted writes are flushed.

Well, but the "read + delay" is already in ata_sdd_pause(). 

So it's "ata_sdd_sync()" that I think is bogus. Based on its name alone, 
it shouldn't have a delay in it (except, as mentioned, possibly for the 
fallback case where no port can be used for reading).

		Linus
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