netdev - Re: [PATCH torvalds-2.6] cdc_ether: fix autosuspend for mbm devices

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Date:	Mon, 26 Apr 2010 12:30:21 +0200
From:	Oliver Neukum <oneukum@...e.de>
To:	Torgny Johansson <torgny.johansson@...csson.com>
Cc:	netdev@...r.kernel.org
Subject: Re: [PATCH torvalds-2.6] cdc_ether: fix autosuspend for mbm devices

Am Montag, 26. April 2010 12:14:13 schrieb Torgny Johansson:
> Hi!
> 
> In 2.6.33 it seems autosuspend is broken for mbm devices.

It is hardly broken. It simply wasn't implemented.

> Autosuspend works until you bring the wwan interface up, then the device does not enter autosuspend anymore.
> 
> The following patch fixes the problem by setting the .manage_power field in the mbm_info struct 
> to the same as in the cdc_info struct (cdc_manager_power).
> 
> I am unsure exactly what that does and why autosuspend doesn't work without it. 
> Can you guys comment on that? Is this fix the correct approach?

The patch is correct. If you use another struct driver_info it is a different
driver as far as usbnet is concerned. A driver needs to give some
minimal support for autosuspend. mbm didn't do so.
 
> Also, if you like this patch, is it possible to get it included in a minor release of 2.6.33 (e.g. 2.6.33.3) as a bugfix?

Up to David.

	Regards
		Oliver
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