linux-kernel - Re: buffer io error on device sr0?

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Date:	Tue, 13 Oct 2009 20:06:16 -0600
From:	Thomas Fjellstrom <tfjellstrom@...w.ca>
To:	linux-kernel@...r.kernel.org
Cc:	Robert Hancock <hancockrwd@...il.com>
Subject: Re: buffer io error on device sr0?

On Tue October 13 2009, Robert Hancock wrote:
> On 10/13/2009 03:43 AM, Thomas Fjellstrom wrote:
> > I'm not sure which version it started, but it seems at least
> > 2.6.32-rc3-git2 has issues with detecting blank DVDR disks.
> >
> > [220595.198654] cdrom: This disc doesn't have any tracks I recognize!
> > [220595.298488] sr 3:0:0:0: [sr0] Unhandled sense code
> > [220595.298492] sr 3:0:0:0: [sr0] Result: hostbyte=DID_OK
> > driverbyte=DRIVER_SENSE
> > [220595.298496] sr 3:0:0:0: [sr0] Sense Key : Blank Check [current]
> > [220595.298501] sr 3:0:0:0: [sr0] Add. Sense: No additional sense
> > information [220595.298505] sr 3:0:0:0: [sr0] CDB: Read(10): 28 00 00 00
> > 00 00 00 00 01 00 [220595.298514] end_request: I/O error, dev sr0, sector
> > 0
> > [220595.298518] Buffer I/O error on device sr0, logical block 0
> > [220595.304554] sr 3:0:0:0: [sr0] Unhandled sense code
> > [220595.304562] sr 3:0:0:0: [sr0] Result: hostbyte=DID_OK
> > driverbyte=DRIVER_SENSE
> > [220595.304570] sr 3:0:0:0: [sr0] Sense Key : Blank Check [current]
> > [220595.304579] sr 3:0:0:0: [sr0] Add. Sense: No additional sense
> > information [220595.304588] sr 3:0:0:0: [sr0] CDB: Read(10): 28 00 00 00
> > 00 00 00 00 01 00 [220595.304609] end_request: I/O error, dev sr0, sector
> > 0
> > [220595.304616] Buffer I/O error on device sr0, logical block 0
> >
> > Unless its supposed to be this way. Although I didn't receive any kind of
> > notification when inserting the disk, as I used to (could be a hal/kde
> > error, but the logs in dmesg seem to hint otherwise).
> 
> Something tried to read off the disk and the drive reported "no way,
> it's blank". That's all this indicates. Most likely HAL or something is
> doing the read..

Ah, I was reading it as "Someone is checking for a disk, lets return an error 
instead of just saying the disk is blank".

Thanks for the clarification.

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-- 
Thomas Fjellstrom
tfjellstrom@...w.ca
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