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SubjectRe: commit 8d2f8cd424 breaks parallel port, regression since 3.9-rc3 / backported to stable (3.4.37)
On Sun, Jun 30, 2013 at 03:47:44PM +0200, Stefan Seyfried wrote:
> Hi all,
>
> the following commit:
>
> commit 8d2f8cd424ca0b99001f3ff4f5db87c4e525f366
> Author: Wang YanQing <udknight@gmail.com>
> Date: Fri Mar 1 11:47:20 2013 +0800
>
> serial: 8250_pci: add support for another kind of NetMos Technology PCI 9835 Multi-I/O Controller
>
> 01:08.0 Communication controller: NetMos Technology PCI 9835 Multi-I/O Controller (rev 01)
> Subsystem: Device [1000:0012]
> Control: I/O+ Mem+ BusMaster- SpecCycle- MemWINV- VGASnoop- ParErr- Stepping- SERR- FastB2B- DisINTx-
> Status: Cap- 66MHz- UDF- FastB2B+ ParErr- DEVSEL=medium >TAbort- <TAbort- <MAbort- >SERR- <PERR- INTx-
> Interrupt: pin A routed to IRQ 20
> Region 0: I/O ports at e050 [size=8]
> Region 1: I/O ports at e040 [size=8]
> Region 2: I/O ports at e030 [size=8]
> Region 3: I/O ports at e020 [size=8]
> Region 4: I/O ports at e010 [size=8]
> Region 5: I/O ports at e000 [size=16]
>
> Signed-off-by: Wang YanQing <udknight@gmail.com>
> Cc: stable <stable@vger.kernel.org>
> Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
>
>
> breaks my
> 05:05.0 Communication controller: NetMos Technology PCI 9835 Multi-I/O Controller (rev 01)
> 05:05.0 0780: 9710:9835 (rev 01)
> Subsystem: 1000:0012
>
> which has two serial and one parallel port, driven by parport_serial.
>
> The reason is, that this commit adds the PCI ID to 8250_pci, when it
> was handled by parport_serial before.
> In my case (openSUSE kernel), 8250 is built in and parport_serial is
> built as a module. Unfortunately with the device occupied by 8250,
> parport_serial finds no device and thus does not drive the parport.
>
> I bisected this in the stable series after the openSUSE kernel update
> (which pulled in the stable kernel update) broke my printing.
>
> Actually the above commit is totally unnecessary: the serial ports
> work very well without it, they are just driven by another driver.
>
> Can this please be reverted? I can't see which problem it solves, but
> it definitely breaks the additional ports on my multi-i/o board.

Thanks for pointing this out, I missed the fact that parport_serial was
already controlling this device. I'll revert it and get it into the
stable trees after it hits Linus's tree (probably next week some time.)

thanks,

greg k-h


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