linux-kernel - [v3.9] [v3.10] [Regression] serial: 8250_pci: add support for another kind of NetMos Technology PCI 9835 Multi-I/O Controller

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Message-ID: <51D1AAF5.5050004@canonical.com>
Date:	Mon, 01 Jul 2013 12:14:45 -0400
From:	Joseph Salisbury <joseph.salisbury@...onical.com>
To:	udknight@...il.com
CC:	Greg KH <gregkh@...uxfoundation.org>, jslaby@...e.cz,
	alan@...ux.intel.com, matts@...mtech-fastcom.com,
	wfp5p@...ginia.edu, tklauser@...tanz.ch,
	linux-serial@...r.kernel.org, LKML <linux-kernel@...r.kernel.org>
Subject: [v3.9] [v3.10] [Regression]  serial: 8250_pci: add support for another
 kind of NetMos Technology PCI 9835 Multi-I/O Controller

Hi Wang,

A bug was opened against the Ubuntu kernel[0].  After a kernel bisect,
it was found that reverting the following commit resolved this bug:

commit 8d2f8cd424ca0b99001f3ff4f5db87c4e525f366
Author: Wang YanQing <udknight@...il.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

The regression was introduced as of v3.9-rc3 and still exists in the
current Mainline tree.  It was also propagated to the stable trees.

The patch causes the device to use the serial module instead of
parport_serial.  Maybe the the quirk in ~drivers/pci/quirks.c
quirk_netmos() needs to be modified?

I see that you are the author of this patch, so I wanted to run this by
you.  I was thinking of requesting a revert, but I wanted to get your
feedback first.

Thanks,

Joe

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