linux-kernel - Re: long-term regression with some usb mass storage devices

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Date:	Fri, 20 Feb 2009 18:11:52 +1030
From:	Mike Lampard <mike@...ambier.net>
To:	linux-kernel@...r.kernel.org
Cc:	stern@...land.harvard.edu
Subject: Re: long-term regression with some usb mass storage devices


added CC

On Fri, 20 Feb 2009 05:17:42 pm Mike Lampard wrote:
> Hi All,
>
> I recently plonked a dvd into my usb-attached Pioneer DVR-107d only to find
> that the current kernels no longer saw the drive as DVD capable.  In fact,
> the kernel no longer saw _any_ features of the drive: sr0: scsi3-mmc drive:
> 0x/0x caddy.  After much bisecting and even more blind luck I narrowed the
> problem down to this commit:
>
> commit bdb2b8cab4392ce41ddfbd6773a3da3334daf836
> Author: Alan Stern <stern@...land.harvard.edu>
> Date:   Tue Jun 24 14:03:14 2008 -0400
>
>     [SCSI] erase invalid data returned by device
>
>     This patch (as1108) fixes a problem that can occur with certain USB
>     mass-storage devices: They return invalid data together with a residue
>     indicating that the data should be ignored.  Rather than leave the
>     invalid data in a transfer buffer, where it can get misinterpreted,
>     the patch clears the invalid portion of the buffer.
>
>     This solves a problem (wrong write-protect setting detected) reported
>     by Maciej Rutecki and Peter Teoh.
>
> Regards
> Mike
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