linux-kernel - Re: [linux-usb-devel] 2.6.19-rc1-mm1 - locks when using "dd bs=1M" from card reader

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Date:	Mon, 23 Oct 2006 11:12:30 +0200
From:	Helge Hafting <helge.hafting@...el.hist.no>
To:	Alan Stern <stern@...land.harvard.edu>
CC:	Christopher Monty Montgomery <xiphmont@...il.com>,
	Paolo Ornati <ornati@...twebnet.it>,
	Kernel development list <linux-kernel@...r.kernel.org>,
	USB development list <linux-usb-devel@...ts.sourceforge.net>
Subject: Re: [linux-usb-devel] 2.6.19-rc1-mm1 - locks when using "dd bs=1M"
 from card reader

Alan Stern wrote:
>>> You could try putting a printk() just before the BUG() to display the 
>>> values of ehci->reclaim and qh->qh_state.  Maybe also change the BUG() to 
>>>   
>>>       
>> ehci->reclaim=0
>> qh->qh_state=5
>>     
>
> 5 is QH_STATE_COMPLETING.  That explains why the BUG() fires.
>
> At this point it's beyond me.  Monty will have to take it from here.
>
>   
>> During boot I get lots of those "Hardware error, end-of-data detected"
>> messages, but I've never seen it crash during bootup.
>>     
>
> Those messages are from the card reader.  It doesn't seem to be working 
> right.  It returns the "end-of-data" error in response to a PREVENT MEDIUM 
> REMOVAL command
Unlike a cdrom, it doesn't have the means to prevent media removal. :-)
>  and it returns a phase error in response to a READ 
> command.  In spite of the fact that it claims to have a 256 MB card 
> present.
>   
It has slots for several different cards, all the other
slots are empty. 

Perhaps it is broken, but interesting as a "stress-test".
Linux should not crash because of a bad usb thing, just complain.

Helge Hafting

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