linux-kernel - Re: [BUG] cdc-acm driver module

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Message-ID: <b49af93b0805212159x46226c63i948e90e263283efc@mail.gmail.com>
Date:	Thu, 22 May 2008 10:29:50 +0530
From:	"vijay anand" <vijayanand.sj@...il.com>
To:	"Oliver Neukum" <oliver@...kum.org>
Cc:	linux-kernel@...r.kernel.org
Subject: Re: [BUG] cdc-acm driver module

Hi Oliver,

Thank you very much for replying.

Given below is the snip from '\linux-2.6.25\drivers\usb\core\driver.c'
for 'usb_driver_release_interface'

****SNIP*****
 * This can be used by drivers to release an interface without waiting
 * for their disconnect() methods to be called.  In typical cases this
 * also causes the driver disconnect() method to be called.
****END*****

What happens when the function 'usb_deregister' in 'acm_exit'  gets
called before the control reaches the 'acm_disconnect'? Is there any
possibility for this? If yes what happens during this scenario?

Thanks,
VJ



On Wed, May 21, 2008 at 6:55 PM, Oliver Neukum <oliver@...kum.org> wrote:
> Am Mittwoch 21 Mai 2008 15:01:21 schrieb vijay anand:
>> What happens when the control never reaches the 'acm_disconnect'. Like simply
>> loading the driver and unloading the driver when the device is still in use.
>
> Even in this case disconnect() will be called.
> The only time it will not be called is if probe() was never called. But
> in that case no interface has been claimed. All is well.
>
>        Regards
>                Oliver
>
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