netdev - RE: [PATCH net-next 1/1] hv_netvsc: Wait for sub-channels to be processed during probe

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Message-ID: <BY2PR0301MB16548DDDA965459CCD308983A0980@BY2PR0301MB1654.namprd03.prod.outlook.com>
Date:	Fri, 17 Jul 2015 15:34:21 +0000
From:	KY Srinivasan <kys@...rosoft.com>
To:	Dexuan Cui <decui@...rosoft.com>,
	"davem@...emloft.net" <davem@...emloft.net>,
	"netdev@...r.kernel.org" <netdev@...r.kernel.org>,
	"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
	"devel@...uxdriverproject.org" <devel@...uxdriverproject.org>,
	"olaf@...fle.de" <olaf@...fle.de>,
	"apw@...onical.com" <apw@...onical.com>,
	"jasowang@...hat.com" <jasowang@...hat.com>,
	"vkuznets@...hat.com" <vkuznets@...hat.com>
Subject: RE: [PATCH net-next 1/1] hv_netvsc: Wait for sub-channels to be
 processed during probe



> -----Original Message-----
> From: Dexuan Cui
> Sent: Friday, July 17, 2015 3:07 AM
> To: KY Srinivasan; davem@...emloft.net; netdev@...r.kernel.org; linux-
> kernel@...r.kernel.org; devel@...uxdriverproject.org; olaf@...fle.de;
> apw@...onical.com; jasowang@...hat.com; vkuznets@...hat.com
> Cc: KY Srinivasan
> Subject: RE: [PATCH net-next 1/1] hv_netvsc: Wait for sub-channels to be
> processed during probe
> 
> > From: K. Y. Srinivasan
> > Sent: Friday, July 17, 2015 3:17
> > Subject: [PATCH net-next 1/1] hv_netvsc: Wait for sub-channels to be
> processed
> > during probe
> >
> > The current code returns from probe without waiting for the proper
> handling
> > of subchannels that may be requested. If the netvsc driver were to be
> rapidly
> > loaded/unloaded, we can  trigger a panic as the unload will be tearing
> > down state that may not have been fully setup yet. We fix this issue by
> making
> > sure that we return from the probe call only after ensuring that the
> > sub-channel offers in flight are properly handled.
> >
> > ---
> >  drivers/net/hyperv/hyperv_net.h   |    2 ++
> >  drivers/net/hyperv/rndis_filter.c |   25 +++++++++++++++++++++++++
> >  2 files changed, 27 insertions(+), 0 deletions(-)
> 
> BTW, not sure if we should make the same fix to storvsc.
> 
> IMO storvsc should have the same issue, at least in theory, though usually it's
> unlikely to unload storvsc.  :-)

You are right; I am planning to submit a similar patch for storvsc. As you note,
this scenario is unlikely for sorvsc.

K. Y
> 
> Thanks,
> -- Dexuan
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