netdev - Re: [PATCH net] net: qmi_wwan: fix Oops while disconnecting

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Message-ID: <CACVXFVOWZc4zA6GR+JrvDTaYVi0a6_3wgzm6TgfR_5bx9USEdQ@mail.gmail.com>
Date:	Thu, 28 Jun 2012 17:11:23 +0800
From:	Ming Lei <tom.leiming@...il.com>
To:	Oliver Neukum <oneukum@...e.de>
Cc:	Bjørn Mork <bjorn@...k.no>,
	netdev@...r.kernel.org, linux-usb@...r.kernel.org,
	Marius Bjørnstad Kotsbak 
	<marius.kotsbak@...il.com>
Subject: Re: [PATCH net] net: qmi_wwan: fix Oops while disconnecting

On Thu, Jun 28, 2012 at 4:35 PM, Oliver Neukum <oneukum@...e.de> wrote:
> Am Dienstag, 26. Juni 2012, 09:23:19 schrieb Ming Lei:

>> IMO, probe is serialized strictly with driver unbind since both the parent
>> lock and its own device lock have been held, so the probe may only be
>> started after driver unbinding is completed.
>
> Yes, but if you have a driver which claims multiple interfaces and uses
> a subdriver, then you will have cases of intfdate being NULL before

We have no such case now.

> disconnect() finishes.

Suppose cdc-ether will support subdriver, ->unbind will set NULL to
the 2nd interface and release the 2nd interface, then subdriver->disconnect()
will be called, looks still no any problem.


Thanks,
-- 
Ming Lei
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