linux-kernel - option.ko: ZTE MF636 support

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Date:	Sat, 08 May 2010 14:27:38 +0100
From:	Peter Hicks <peter.hicks@...gs.co.uk>
To:	linux-kernel@...r.kernel.org
Subject: option.ko: ZTE MF636 support

Hello

I've discovered that the ZTE MF636 USB HSUPA modem (USB ID 19d2:0033)
doesn't play well with option.ko.  This seems to be a similar problem to
the 4G W14 stick (commit a74171005f2f6474e05bdfccb05c9f0d68224a49).

The symptom of this problem is that the first three serial ports on the
MF636 take around 10s to open with modem-manager, and fail to open with
Minicom.  The fourth serial port is fine.

Blacklisting the first three interfaces in option.c results in them
opening immediately.  This reduces modem detection time in modem-manager
from 20-30 seconds to around five.

As there is only a single blacklisted device in option.c at present,
what is the best way to work around this problem?  Can somebody help me
with writing a patch to submit to fix the problem in the kernel?

Regards,

Peter

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