linux-kernel - Re: [RFC] usb: add 'usb_get_intf()' call into the probe methods of drivers for usb interfaces.

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Message-ID: <CAFCUKTS2NO4gptEqSjpZznXLtpj6qpjWhq96WonhcZBE8A-VYg@mail.gmail.com>
Date:	Wed, 21 Nov 2012 09:51:24 +0800
From:	harvey yang <harvey.huawei.yang@...il.com>
To:	Alan Stern <stern@...land.harvard.edu>
Cc:	Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
	linux-usb@...r.kernel.org, linux-kernel@...r.kernel.org
Subject: Re: [RFC] usb: add 'usb_get_intf()' call into the probe methods of
 drivers for usb interfaces.

Thanks for your comments :)

Harvey


On Wed, Nov 21, 2012 at 12:09 AM, Alan Stern <stern@...land.harvard.edu> wrote:
> On Mon, 19 Nov 2012, harvey yang wrote:
>
>> Hi, all
>> I checked many usb drivers in the mainline kernel which do not record
>> this reference in their probe methods. But according to the documents
>> about this function, we shoud record this reference in our probe
>> methods, just as the call to 'usb_get_dev()' to reference a usb
>> device. Are these usb drivers right or we need to fix them?
>
> The drivers are right; they do not need to be fixed.  The reason is
> because the drivers will be unbound automatically when the device or
> interface is unregistered.
>
> The only reason for a driver to take a reference would be if it wanted
> to continue using the device after it was unbound.  But drivers aren't
> supposed to do that.
>
> Alan Stern
>
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