Re: IDE cdrom problem with PLEXTOR DVDR PX-608AL

[Borislav Petkov <petkovbb@googlemail.com>]

On Thu, Feb 14, 2008 at 02:42:58PM +0100, Boris Petkov wrote:
> On 2/14/08, Bartlomiej Zolnierkiewicz <bzolnier@gmail.com> wrote:
> > On Thursday 14 February 2008, Borislav Petkov wrote:
> > > On Thu, Feb 14, 2008 at 12:37:50AM +0100, Hans-Peter Jansen wrote:
> > >
> > > [Added Bart to CC]
> > >
> > > > Am Dienstag, 12. Februar 2008 schrieb Borislav Petkov:
> > > > > On Tue, Feb 12, 2008 at 10:26:17AM +0100, Hans-Peter Jansen wrote:
> > > > > > Hi,
> > > > > >
> > > > > > I suffer from unreliable cdrom operations (failing DAE and burn
> > > > > > sessions) with the openSUSE 2.6.18.8-0.7-bigsmp kernel.
> > > > >
> > > > >                   ^^^^
> > > > > Hi,
> > > > >
> > > > > can please you test this with a more recent kernel. Yours is almost
> > > > > ancient - from Sep. 2006.
> > > >
> > > > Sure, sorry. Here we go:
> > > >
> > > > Feb 14 00:18:18 kernel: hde: cdrom_pc_intr: The drive appears confused (ireason = 0x01).
> > > >  Trying to recover by ending request.
> > > > Feb 14 00:27:27 kernel: hdc: cdrom_pc_intr: The drive appears confused (ireason = 0x01).
> > > >  Trying to recover by ending request.
> > > >
> > > > ~> uname -a
> > > > Linux xrated 2.6.24.1-35-pae #1 SMP 2008/02/12 01:00:18 UTC i686 athlon i386 GNU/Linux
> > >
> > > Actually the interrupt handler in ide-cd got rewritten and you're still using the
> > > old one (cdrom_pc_intr vs cdrom_newpc_intr). Those changes went into mainline before
> > > the 2.6.25-rc1 so we'll be able to test the new one only when you try out 2.6.25-rc1
> > > or wait until 2.6.25 is released in case you don't want to try hazardous materials
> > > such as an -rc kernel[*] :).
> > >
> > > Bart?
> > >
> > > *. As a matter of fact it runs quite smoothly on my machines.
> >
> > 2.6.25-rc1-git1 if you are using IDE.
> >
> > however it may still have this problem
> >
> >        if (ireason == 0) {
> >                write = 1;
> >                xferfunc = HWIF(drive)->atapi_output_bytes;
> >        } else if (ireason == 2 || (ireason == 1 &&
> >                   (blk_fs_request(rq) || blk_pc_request(rq)))) {
> >
> > we problably need to call ide_cd_check_ireason() also for REQ_TYPE_ATA_PC
> > requests and remove (blk_fs_request(rq) || blk_pc_request(rq) here
> >
> >                write = 0;
> >                xferfunc = HWIF(drive)->atapi_input_bytes;
> >        } else {
> >                printk(KERN_ERR "%s: %s: The drive "
> >                                "appears confused (ireason = 0x%02x). "
> >                                "Trying to recover by ending request.\n",
> >                                drive->name, __FUNCTION__, ireason);
> >                goto end_request;
> >        }
> >
> > Bart
> >
> Hans-Peter,
> 
> i will prepare a patch against 2.6.24 for you to try later.
Hi,

i thought that backporting ide-cd to 2.6.24 would be self-contained but the
problem is that it pulls in changes made in the block layer (ll_rw_blk.c splitup)
and if i pull those also in the patch, i can't guarantee the stability of your
system. Besides, this turns pretty fast into a chained pulling which will result
into a subset of 2.6.25-rc1 applied ontop of your 2.6.24.1 kernel so the only
alternative is to wait after 2.6.25 has been released and tackle the problem then.

-- 
Regards/Gruß,
    Boris.