netdev - Re: [PATCHv2][RFC] smsc95xx: enable dynamic autosuspend

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Date:	Fri, 14 Dec 2012 15:22:31 +0100
From:	Oliver Neukum <oneukum@...e.de>
To:	Steve Glendinning <steve@...well.net>
Cc:	Ming Lei <ming.lei@...onical.com>,
	Steve Glendinning <steve.glendinning@...well.net>,
	netdev <netdev@...r.kernel.org>, linux-usb@...r.kernel.org,
	Greg Kroah-Hartman <gregkh@...uxfoundation.org>
Subject: Re: [PATCHv2][RFC] smsc95xx: enable dynamic autosuspend

On Friday 14 December 2012 13:35:04 Steve Glendinning wrote:

> Thanks Ming, I've updated this.

Very good. Good catch Ming.

> > IMO, it is better to keep smsc95xx_info.manage_power as NULL
> > for devices without FEATURE_AUTOSUSPEND, so that fewer code
> > and follow the current .mange_power usage(see its comment).
> >
> > Currently, if the function pointer of manage_power is set, it means that
> > the device supports USB autosuspend, but your trick will make the

manage_power() can return errors. So the assumption was always
strictly speaking invalid.

> > assumption not true for some smsc devices.
> 
> Oliver?

On second thought, I think that if a driver can do manage_power(), even
only for a subset of devices, it should implement it. Doctoring the table of methods
is very, very ugly, especially as this not protected by a lock.

But this is not nice. We need a better way.

	Regards
		Oliver

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