Date:	Tue, 19 Feb 2008 01:17:24 +0100
From:	Bartlomiej Zolnierkiewicz <bzolnier@...il.com>
To:	Kiyoshi Ueda <k-ueda@...jp.nec.com>
Cc:	petkovbb@...il.com, schwab@...e.de, linux-kernel@...r.kernel.org,
	jens.axboe@...cle.com, j-nomura@...jp.nec.com
Subject: Re: [PATCH] ide-cd: fix missing residual count setting in DMA mode (Was 2.6.25-rc1/2 CD/DVD burning broken)

On Tuesday 19 February 2008, Kiyoshi Ueda wrote:
> Hi,
> 
> On Mon, 18 Feb 2008 23:37:48 +0100, Borislav Petkov wrote:
> > On Mon, Feb 18, 2008 at 09:20:41PM +0100, Borislav Petkov wrote:
> > > On Mon, Feb 18, 2008 at 01:58:27PM -0500, Kiyoshi Ueda wrote:
> > > > Hi Andreas,
> > > > 
> > > > On Sat, 16 Feb 2008 21:52:21 +0100, Andreas Schwab wrote:
> > > > > Since commit aaa04c28cb9a1efd42541fdb7ab648231c2a2263 [blk_end_request:
> > > > > changing ide-cd (take 4)] I cannot burn any CD/DVD any more, getting the
> > > > > following error from wodim:
> > > > > 
> > > > > Errno: 0 (Success), write_g1 scsi sendcmd: no error
> > > > > CDB:  2A 00 00 00 00 00 00 00 1F 00
> > > > > status: 0x2 (CHECK CONDITION)
> > > > > Sense Bytes: 70 00 05 00 00 00 00 0E 00 00 00 00 21 02 00 00
> > > > > Sense Key: 0x5 Illegal Request, Segment 0
> > > > > Sense Code: 0x21 Qual 0x02 (invalid address for write) Fru 0x0
> > > > > Sense flags: Blk 0 (not valid) 
> > > > > resid: 63488
> > > > 
> > > > Could you try this patch?
> > > > I've only done a compile test, so this patch may not work.
> > > > 
> > > > During the conversion to blk_end_request, the code was changed
> > > > *not* to set rq->data_len = 0.
> > > > I removed that part because I thought it was just a trigger to
> > > > call post_transform_command().  However, since data_len can be
> > > > used as a residual length of the transfer, it might have to remain
> > > > there.
> > > > Actually, wodim seems checking the residual count how far it wrote
> > > > (e.g. wodim/wodim.c:write_track_data()).
> > > 
> > > and there seems to be some discrepancy between the different burning tools for i
> > > just did test burning a cdimage with cdrdao unter 2.6.25-rc2 and it _works_
> > > flawlessly:
> > > 
> > > # cdrdao write --device /dev/hdc test.toc
> > > 
> > > Cdrdao version 1.2.2 - (C) Andreas Mueller <andreas@...eb.de>
> > >   SCSI interface library - (C) Joerg Schilling
> > >   Paranoia DAE library - (C) Monty
> > > 
> > > Check http://cdrdao.sourceforge.net/drives.html#dt for current driver tables.
> > > 
> > > Using libscg version 'ubuntu-0.8ubuntu1'
> > > 
> > > /dev/hdc: TOSHIBA ODD-DVD SD-R6372	Rev: 1730
> > > Using driver: Generic SCSI-3/MMC - Version 2.0 (options 0x0000)
> > > 
> > > Starting write at speed 4...
> > > Pausing 10 seconds - hit CTRL-C to abort.
> > > Process can be aborted with QUIT signal (usually CTRL-\).
> > > Turning BURN-Proof on
> > > Executing power calibration...
> > > Power calibration successful.
> > > Writing track 01 (mode MODE1_RAW/MODE1_RAW )...
> > > Wrote 1 of 18 MB (Buffers 100%  94%).
> > > Wrote 2 of 18 MB (Buffers 100%  94%).
> > > Wrote 3 of 18 MB (Buffers 100%  94%).
> > > Wrote 4 of 18 MB (Buffers 100%  94%).
> > > Wrote 5 of 18 MB (Buffers 100%  94%).
> > > Wrote 6 of 18 MB (Buffers 100%  94%).
> > > Wrote 7 of 18 MB (Buffers 100%  94%).
> > > Wrote 8 of 18 MB (Buffers 100%  94%).
> > > Wrote 9 of 18 MB (Buffers 100%  94%).
> > > Wrote 10 of 18 MB (Buffers 100%  94%).
> > > Wrote 11 of 18 MB (Buffers 100%  94%).
> > > Wrote 12 of 18 MB (Buffers 100%  94%).
> > > Wrote 13 of 18 MB (Buffers 100%  94%).
> > > Wrote 14 of 18 MB (Buffers 100%  94%).
> > > Wrote 15 of 18 MB (Buffers 100%  94%).
> > > Wrote 16 of 18 MB (Buffers 100%  94%).
> > > Wrote 17 of 18 MB (Buffers 100%  94%).
> > > Wrote 18 of 18 MB (Buffers 100%  94%).
> > > 
> > > Wrote 8056 blocks. Buffer fill min 100%/max 100%.
> > > Flushing cache...
> > > Writing finished successfully.
> > > 
> > > > This patch brings back the rq->data_len = 0.
> > > > 
> > > > --- 2.6.25-rc2/drivers/ide/ide-cd.c	2008-02-15 15:57:20.000000000 -0500
> > > > +++ ide-fix/drivers/ide/ide-cd.c	2008-02-18 01:23:40.000000000 -0500
> > > > @@ -1207,9 +1207,13 @@ static ide_startstop_t cdrom_newpc_intr(
> > > >  end_request:
> > > >  	if (blk_pc_request(rq)) {
> > > >  		unsigned long flags;
> > > > +		unsigned int dlen = rq->data_len;
> > > > +
> > > > +		if (dma)
> > > > +			rq->data_len = 0;
> > > >  
> > > >  		spin_lock_irqsave(&ide_lock, flags);
> > > > -		if (__blk_end_request(rq, 0, rq->data_len))
> > > > +		if (__blk_end_request(rq, 0, dlen))
> > > >  			BUG();
> > > >  		HWGROUP(drive)->rq = NULL;
> > > >  		spin_unlock_irqrestore(&ide_lock, flags);
> > > > 
> > > > Thanks,
> > > > Kiyoshi Ueda
> > > 
> > > next will test the one above...
> > 
> > 
> > confirmed here too - burning succeeds both with wodim and cdrdao.
> 
> Thank you for testing, Laura, Andreas, Boris.
> And I'm really sorry about the bug, all.
> 
> 
> Bart,
> Please review and apply the patch below to fix the bug.
> 
> 
> [PATCH] ide-cd: fix missing residual count setting in DMA mode
> 
> This patch fixes the missing residual count setting in DMA mode,
> which was introduced during the conversion to blk-end-request.
> The residual count could be used by the request submitter.
> So if it isn't set correctly, some upper layers does not work.
> (e.g. wodim for CD burning.)
> 
> The bug is in only DMA mode.
> In PIO mode, we are setting the residual count correctly,
> so no need to fix.
> 
> Signed-off-by: Kiyoshi Ueda <k-ueda@...jp.nec.com>
> Signed-off-by: Jun'ichi Nomura <j-nomura@...jp.nec.com>

Looks fine, thanks for fixing it so quickly.

Applied.
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