linux-kernel - Re: USB regression (and other failures) in 2.6.2[45]*

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Date:	Wed, 20 Feb 2008 12:15:12 -0500 (EST)
From:	Alan Stern <stern@...land.harvard.edu>
To:	Andrew Buehler <abuehler.kernel@...il.com>
cc:	Oliver Pinter <oliver.pntr@...il.com>,
	Kernel development list <linux-kernel@...r.kernel.org>,
	Andrew Morton <akpm@...ux-foundation.org>,
	Greg KH <greg@...ah.com>,
	SCSI development list <linux-scsi@...r.kernel.org>,
	USB list <linux-usb@...r.kernel.org>
Subject: Re: USB regression (and other failures) in 2.6.2[45]* - mostly
 resolved

On Wed, 20 Feb 2008, Andrew Buehler wrote:

> > What do you mean by "does not see the drive"?
> 
> Its detect-hardware-and-report mode shows a HD size of 0 (which is what
> it has showed in cases where the kernel has not detected the drive), its
> detect-partitions-and-report mode shows no partitions and no devices
> which can have partitions, and attempting to actually use it to pull
> down a drive image (it's a disk-imaging program) causes it to hang at
> the point where it would begin to write.
> 
> Hmm. One thing which just sprang to mind, in the stab-in-the-dark
> category: in 2.6.24.2, launching the program on some machines gave
> warnings along the lines of "this program is using a deprecated ioctl,
> please convert it to SG_IO" (which I naturally cannot do since it's
> closed and I don't have the source),

You can ask the program's author to update it.

> but IIRC in the 2.5.25-rc2-based
> disc with ACPI enabled no such message appears. If the reason that there
> are no longer such messages is that the ioctl in question has now been
> removed, that might explain why the program does not see the drive.

Could be.  You can use strace to find out what system calls the program 
is making.


> I'm not sure I expressed myself clearly. I do not think the problem is
> with the different kernels. I think the problem is with the different
> configurations. I am asking if there are any established techniques for
> comparing differences between config files from widely different
> kernels.

Not as far as I know.

Alan Stern

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