Hi,
On Monday 12 March 2007, Sergei Shtylyov wrote:
> Hello.
>
> Tejun Heo wrote:
>
> > Stanislav Brabec reported that IOMEGA IDE ZIP drive doesn't work with
> > recent kernels. Low level driver is via82cxxx. Relevant part of
> > 2.6.20.1 boot message follows.
>
> > VP_IDE: IDE controller at PCI slot 0000:00:11.1
> > VP_IDE: chipset revision 6
> > VP_IDE: not 100% native mode: will probe irqs later
> > VP_IDE: VIA vt8233 (rev 00) IDE UDMA100 controller on pci0000:00:11.1
> > ide0: BM-DMA at 0xff00-0xff07, BIOS settings: hda:DMA, hdb:pio
> > ide1: BM-DMA at 0xff08-0xff0f, BIOS settings: hdc:DMA, hdd:DMA
> > Probing IDE interface ide0...
> > hda: ST3160812A, ATA DISK drive
> > hdb: IOMEGA ZIP 100 ATAPI, ATAPI FLOPPY drive
> > ide0 at 0x1f0-0x1f7,0x3f6 on irq 14
> > ...
> > hdb: lost interrupt
> > hdb: status error: status=0x00 { }
> > ide: failed opcode was: unknown
> > ide-floppy: Strange, packet command initiated yet DRQ isn't asserted
> > ...
> > hdb: 98304kB, 96/64/32 CHS, 4096 kBps, 512 sector size, 2941 rpm
> > hdb: No disk in drive
> > hdb: lost interrupt
> > hdb: status error: status=0x00 { }
> > ide: failed opcode was: unknown
> > ide-floppy: Strange, packet command initiated yet DRQ isn't asserted
> > [above repeats several times]
> > ...
> > hdb: lost interrupt
> > hdb: status error: status=0x00 { }
> > ide: failed opcode was: unknown
> > ide-floppy: Strange, packet command initiated yet DRQ isn't asserted
> > hdb: 98304kB, 196608 blocks, 512 sector size
> > hdb: unknown partition table
> > hdb: unknown partition table
> > hdb: unknown partition table
> > hdb: unknown partition table
>
> > And the device is inaccessible after boot completed. On suse 10.1
> > kernel (2.6.16 based), it works better.
>
> > VP_IDE: IDE controller at PCI slot 0000:00:11.1
> > PCI: VIA IRQ fixup for 0000:00:11.1, from 255 to 0
> > VP_IDE: chipset revision 6
> > VP_IDE: not 100% native mode: will probe irqs later
> > VP_IDE: VIA vt8233 (rev 00) IDE UDMA100 controller on pci0000:00:11.1
> > ide0: BM-DMA at 0xff00-0xff07, BIOS settings: hda:DMA, hdb:pio
> > ide1: BM-DMA at 0xff08-0xff0f, BIOS settings: hdc:DMA, hdd:DMA
> > Probing IDE interface ide0...
> > hda: ST3160812A, ATA DISK drive
> > hdb: IOMEGA ZIP 100 ATAPI, ATAPI FLOPPY drive
> > ide0 at 0x1f0-0x1f7,0x3f6 on irq 14
> > ...
> > hdb: No disk in drive
> > hdb: 98304kB, 96/64/32 CHS, 4096 kBps, 512 sector size, 2941 rpm
> > ...
> > hdb: lost interrupt
> > hdb: status error: status=0x00 { }
> > ide: failed opcode was: unknown
> > ide-floppy: Strange, packet command initiated yet DRQ isn't asserted
> > hdb: 98304kB, 196608 blocks, 512 sector size
> > hdb: unknown partition table
>
> > There is one lost interrupt message but the drive reportedly works
> > fine after that. Stanislav also seems to recall that ide-floppy
> > worked without any error message with older kernel.
>
> > I'm attaching full boot log messages for 2.6.20.1 and suse 10.1.
>
> > Any ideas?
>
> BTW... I've looked at that code last spring and found it strange that
> ide-floopy is the only driver that still calls dma_start() method *before*
> issuing a command *while this is not a right thing to do accoring to spec and
> is known to not work with some chips, namely Promise). I was going to send a
> patch then but lacking both time and actual hardware, kept deferring it
> since... :-)
We are probably hitting two bugs here:
* regression between 2.6.16-2.6.20
* the issue that Sergei described
Stanislav, could you use git bisect to narrow down the problem
to the specific patch?
Good practical example of using git-bisect is here:
http://www.reactivated.net/weblog/archives/2006/01/using-git-bisect-to-find-buggy-kernel-patches/
Thanks,
Bart
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