linux-kernel - Re: [Bugme-new] [Bug 8885] New: Unable to access memory card reader anymore

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Message-Id: <20070813215352.18af0776.akpm@linux-foundation.org>
Date:	Mon, 13 Aug 2007 21:53:52 -0700
From:	Andrew Morton <akpm@...ux-foundation.org>
To:	linux-kernel@...r.kernel.org, linux-scsi@...r.kernel.org,
	linux-usb-devel@...ts.sourceforge.net,
	Pierre Ossman <drzeus@...eus.cx>,
	Michal Piotrowski <michal.k.k.piotrowski@...il.com>
Cc:	bugme-daemon@...zilla.kernel.org, casteyde.christian@...e.fr
Subject: Re: [Bugme-new] [Bug 8885] New: Unable to access memory card reader
 anymore


(resend, fixed mailing list address)

On Mon, 13 Aug 2007 09:07:36 -0700 (PDT) bugme-daemon@...zilla.kernel.org wrote:

> http://bugzilla.kernel.org/show_bug.cgi?id=8885
> 
>            Summary: Unable to access memory card reader anymore
>            Product: IO/Storage
>            Version: 2.5
>      KernelVersion: 2.6.23-rc3
>           Platform: All
>         OS/Version: Linux
>               Tree: Mainline
>             Status: NEW
>           Severity: normal
>           Priority: P1
>          Component: SCSI
>         AssignedTo: io_scsi@...nel-bugs.osdl.org
>         ReportedBy: casteyde.christian@...e.fr
> 
> 
> Most recent kernel where this bug did not occur: 2.6.22.1, maybe 2.6.23-rc2
> Distribution: Slackware 12.0
> Hardware Environment: Athlon64 3000, laptop Aspire 1511LMi, nForce3 150
> Software Environment: Kernel 2.6.23-rc3, blockdev, udev, KDE 3.5.7
> Problem Description:
> With kernel 2.6.22.1, when I plug a memory card in the integrated card reader
> of my laptop, the card is detected and KDE(via udev) asks me for mounting the
> device.
> With kernel 2.6.23-rc3, this does not happens anymore:
> - first, at boot, there are some new lines in dmesg saying /dev/sda is seen but
> size cannot be get (normal: there is no memory card in the reader);
> - second, plugging the card does nothing;
> - third, issuing "blockdev --rereadpt /dev/sda" does not work;
> - finally, fdisk /dev/sda fails (unable to open /dev/sda).
> So the device seems to be completly unusable now (this is a Thomson card reader
> if I remember well).
> 
> dmesg output for 2.6.22.1-cfs19 and 2.6.23-rc3 appended to show the
> differences.
> 
> Steps to reproduce:
> Maybe the problem is specific to my hardware. I presume: boot with an empty
> card reader connected, the plug the card and see it is inaccessible?
> 

I'm struggling a bit to work out if this is a scsi bug, a USB bug, an MMC bug
or whatever.  But it's a bug.

Michal, can you please track this as a post-2.6.22 regression?

Others: can you please take a look at the dmesg output, see if we can work
out which subsystem is (newly) failing?

Thanks.
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