linux-kernel - Re: [PATCH net 2/4] hv_netvsc: reset vf

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Date:	Fri, 12 Aug 2016 20:40:48 -0700 (PDT)
From:	David Miller <davem@...emloft.net>
To:	vkuznets@...hat.com
Cc:	netdev@...r.kernel.org, devel@...uxdriverproject.org,
	linux-kernel@...r.kernel.org, haiyangz@...rosoft.com,
	kys@...rosoft.com
Subject: Re: [PATCH net 2/4] hv_netvsc: reset vf_inject on VF removal

From: Vitaly Kuznetsov <vkuznets@...hat.com>
Date: Thu, 11 Aug 2016 12:58:55 +0200

> We reset vf_inject on VF going down (netvsc_vf_down()) but we don't on
> VF removal (netvsc_unregister_vf()) so vf_inject stays 'true' while
> vf_netdev is already NULL and we're trying to inject packets into NULL
> net device in netvsc_recv_callback() causing kernel to crash.
> 
> Signed-off-by: Vitaly Kuznetsov <vkuznets@...hat.com>

You can't create a blocking operation problem knowingly in this
patch just because you fix it in patch #4.

You must order your patches such that the driver does not regress
at any intermediate stage of your patch series.