linux-kernel - Re: [BUG] Linux-2.6.31-rc1-git9 Cannot Recognize Empty DVD Media

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Date:	Wed, 08 Jul 2009 09:27:24 -0500
From:	James Bottomley <James.Bottomley@...senPartnership.com>
To:	Maciej Rutecki <maciej.rutecki@...il.com>
Cc:	Andrew Morton <akpm@...ux-foundation.org>,
	Tarkan Erimer <tarkan.erimer@...knet.net.tr>,
	linux-kernel@...r.kernel.org, linux-scsi@...r.kernel.org
Subject: Re: [BUG] Linux-2.6.31-rc1-git9 Cannot Recognize Empty DVD Media

On Wed, 2009-07-08 at 15:09 +0200, Maciej Rutecki wrote:
> Similar issue on 2 machines. 2.6.31-rc1-git3 works ok. 2.6.31-rc2
> cannot recognize *any* DVD media with K3b. No messages in dmesg or
> syslog.
> 
> Unfortunately I can't try bisection, because I don't have more time
> (work). I try do it at the end of week.

Also were there any tools upgrades around this?  The messages:

> [ 4526.750295] sr 0:0:0:0: [sr0] Result: hostbyte=DID_OK 
> driverbyte=DRIVER_SENSE
> [ 4526.750302] sr 0:0:0:0: [sr0] Sense Key : Illegal Request [current]
> [ 4526.750308] sr 0:0:0:0: [sr0] Add. Sense: Illegal mode for this track
> [ 4526.750316] end_request: I/O error, dev sr0, sector 0
> [ 4526.750321] Buffer I/O error on device sr0, logical block 0

Clearly imply the errors are coming from the device:  The sense code is
generated by it.  So this means that either the DVD has been put into
some type of wrong mode or something in sr is sending the wrong command.

You might also try this patch from martin petersen:  it will print out
the actual command that's causing the problems ... that might give a
clue.

James

---

Subject: [PATCH] SCSI: Print failed commands
From:	"Martin K. Petersen" <martin.petersen@...cle.com>

When a request fails we print the sense data but not the actual command
that failed.  Add a printout of the operation + CDB for failed commands.

Signed-off-by: Martin K. Petersen <martin.petersen@...cle.com>

---

diff --git a/drivers/scsi/scsi_lib.c b/drivers/scsi/scsi_lib.c
index 30f3275..79ea5be 100644
--- a/drivers/scsi/scsi_lib.c
+++ b/drivers/scsi/scsi_lib.c
@@ -896,6 +896,7 @@ void scsi_io_completion(struct scsi_cmnd *cmd, unsigned int good_bytes)
 			scsi_print_result(cmd);
 			if (driver_byte(result) & DRIVER_SENSE)
 				scsi_print_sense("", cmd);
+			scsi_print_command(cmd);
 		}
 		blk_end_request_all(req, -EIO);
 		scsi_next_command(cmd);



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