netdev - Re: [PATCH v1] net/core: support runtime PM on net

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Message-ID: <CACVXFVPu1m3CJaFavW9eaU3Z850q+x1N_Yo7tri1UTFpgfYVXQ@mail.gmail.com>
Date:	Thu, 18 Oct 2012 19:01:06 +0800
From:	Ming Lei <ming.lei@...onical.com>
To:	Bjørn Mork <bjorn@...k.no>
Cc:	"David S. Miller" <davem@...emloft.net>,
	"Rafael J. Wysocki" <rjw@...k.pl>, Oliver Neukum <oneukum@...e.de>,
	Alan Stern <stern@...land.harvard.edu>, netdev@...r.kernel.org,
	linux-pm@...r.kernel.org
Subject: Re: [PATCH v1] net/core: support runtime PM on net_device

On Thu, Oct 18, 2012 at 4:29 PM, Bjørn Mork <bjorn@...k.no> wrote:
> Ming Lei <ming.lei@...onical.com> writes:
>
>> In ioctl path on net_device, the physical deivce is often
>> touched, but the physical device may have been put into runtime
>> suspend state already, so cause some utilitis(ifconfig, ethtool,
>> ...) to return failure in this situation.
>
> I have to as the stupid questions again, sorry...
>
> Just wondering, isn't that really a driver problem?  The driver will

It is or not, :-)

> know whether or not hardware access is required, and should wake up the

The netcore knows that first,  doesn't it？

> device if necessary.  Unless I misunderstand something here, this seems
> like papering over driver bugs?

Suppose it is driver bug, and basically most network drivers don't consider
that, and we can fix that in netcore generally, so why bother all drivers to do
that?


Thanks,
--
Ming Lei
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