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

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Message-ID: <1384334146.5724.13.camel@linux-fkkt.site>
Date:	Wed, 13 Nov 2013 10:15:46 +0100
From:	Oliver Neukum <oliver@...kum.org>
To:	Bjørn Mork <bjorn@...k.no>
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

On Wed, 2013-11-13 at 10:09 +0100, Bjørn Mork wrote:
> 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.

True. I take back the objection.

	Regards
		Oliver


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