netdev - Re: [PATCH 0/4] Add a driver for the ASIX AX88172A

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Message-ID: <CANEJEGuiw7w0aV47AnRQGzqBNCyAb7jj9t+Dh2XbzwMtV=doWw@mail.gmail.com>
Date:	Mon, 9 Jul 2012 10:45:28 -0700
From:	Grant Grundler <grundler@...omium.org>
To:	Christian Riesch <christian.riesch@...cron.at>
Cc:	netdev@...r.kernel.org, Oliver Neukum <oneukum@...e.de>,
	Eric Dumazet <edumazet@...gle.com>,
	Allan Chou <allan@...x.com.tw>,
	Mark Lord <kernel@...savvy.com>,
	Ming Lei <tom.leiming@...il.com>,
	Michael Riesch <michael@...sch.at>
Subject: Re: [PATCH 0/4] Add a driver for the ASIX AX88172A

Christian,
Here's my $0.02 response to your questions.

On Fri, Jul 6, 2012 at 4:33 AM, Christian Riesch
<christian.riesch@...cron.at> wrote:
...
> I have a few questions:
>
> 1) Is it ok to factor out the common code like I did? Or should
>    it go into a separate kernel module?

I think it's ok. I'd rather not see additional kernel modules unless
the driver is substantially different.


> 2) phylib/usbnet: Currently I have an empty .status function
>    in my const struct driver_info ax88172a_info. I think this
>    notifies me of a link change, right? I don't know
>    what I should do in this function. Trigger the phy state machine
>    like a phy interrupt would do, since link changes are handled
>    by the phy state machine?

I don't see any Documentation for this entry point. My reading of the
code is driver_info->status (include/linux/usb/usbnet.h) is to poll
current link status from URBs. See  usbnet_probe()  (calls
init_status()) and intr_complete() (calls your stub).  I also looked
at usbnet_cdc_status() in cdc_ethernet.c. Maybe other drivers are
better examples.

hth,
grant
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