netdev - Re: [PATCH] usbnet: fix status interrupt urb handling

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Date:	Wed, 13 Nov 2013 10:09:56 +0100
From:	Bjørn Mork <bjorn@...k.no>
To:	Oliver Neukum <oliver@...kum.org>
Cc:	Felix Fietkau <nbd@...nwrt.org>, netdev@...r.kernel.org,
	linux-usb@...r.kernel.org, dcbw@...hat.com
Subject: Re: [PATCH] usbnet: fix status interrupt urb handling

Oliver Neukum <oliver@...kum.org> writes:

> On Tue, 2013-11-12 at 16:34 +0100, Felix Fietkau wrote:
>> Since commit 7b0c5f21f348a66de495868b8df0284e8dfd6bbf
>> "sierra_net: keep status interrupt URB active", sierra_net triggers
>> status interrupt polling before the net_device is opened (in order to
>> properly receive the sync message response).
>> 
>> To be able to receive further interrupts, the interrupt urb needs to be
>> re-submitted, so this patch removes the bogus check for netif_running().
>
> And what about the other drivers for whom this patch means added
> traffic? This fix is done with a sledge hammer and cares only about
> some drivers.

usbnet_stop calls usbnet_status_stop which kills the status URB, unless
the driver explicitly asked for it not to be killed.  And the callback
properly returns on status == -ENOENT, before the lines in question.

So I think Felix is right.   None of the other drivers will ever hit the
code he deletes. It only affects sierra_net, and that is unwanted.



Bjørn
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