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

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Message-ID: <ed6433db194c4f2393cc462b538d9b2f@SIXPR30MB031.064d.mgd.msft.net>
Date:	Fri, 17 Jul 2015 10:07:03 +0000
From:	Dexuan Cui <decui@...rosoft.com>
To:	KY Srinivasan <kys@...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>
CC:	KY Srinivasan <kys@...rosoft.com>
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.  :-)

Thanks,
-- Dexuan
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