netdev - Re: [PATCH 1/2] usbnet: allow status interrupt URB to always be active

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Date:	Fri, 04 Jan 2013 23:16:31 +0100
From:	Oliver Neukum <oliver@...kum.org>
To:	Dan Williams <dcbw@...hat.com>
Cc:	Elina Pasheva <epasheva@...rrawireless.com>,
	netdev@...r.kernel.org, linux-usb@...r.kernel.org,
	Rory Filer <rfiler@...rrawireless.com>,
	Phil Sutter <phil@....cc>
Subject: Re: [PATCH 1/2] usbnet: allow status interrupt URB to always be active

On Friday 04 January 2013 10:48:16 Dan Williams wrote:
> Some drivers (ex sierra_net) need the status interrupt URB
> active even when the device is closed, because they receive
> custom indications from firmware.  Allow sub-drivers to set
> a flag that submits the status interrupt URB on probe and
> keeps the URB alive over device open/close.  The URB is still
> killed/re-submitted for suspend/resume, as before.
> 
> Signed-off-by: Dan Williams <dcbw@...hat.com>
> ---
> Oliver: alternatively, is there a problem with *always*
> submitting the interrupt URB, and then simply not calling
> the subdriver's .status function when the netdev is
> closed?  That would be a much simpler patch.

That is quite radical. We have no idea what a device
does when we do not react to a status update. I would
much prefer to not take the risk.
Besides, we don't use bandwidth if we don't have to.

	Regards
		Oliver

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