linux-kernel - Re: [PATCH net,1/2] hyperv: Fix a kernel warning from netvsc_linkstatus

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Message-Id: <20130408.121614.2170605259377916404.davem@davemloft.net>
Date:	Mon, 08 Apr 2013 12:16:14 -0400 (EDT)
From:	David Miller <davem@...emloft.net>
To:	haiyangz@...rosoft.com
Cc:	netdev@...r.kernel.org, kys@...rosoft.com, olaf@...fle.de,
	jasowang@...hat.com, linux-kernel@...r.kernel.org,
	devel@...uxdriverproject.org
Subject: Re: [PATCH net,1/2] hyperv: Fix a kernel warning from
 netvsc_linkstatus_callback()

From: Haiyang Zhang <haiyangz@...rosoft.com>
Date: Fri,  5 Apr 2013 14:44:39 -0700

> The warning about local_bh_enable inside IRQ happens when disconnecting a
> virtual NIC.
> 
> The reason for the warning is -- netif_tx_disable() is called when the NIC
> is disconnected. And it's called within irq context. netif_tx_disable() calls
> local_bh_enable() which displays warning if in irq.
> 
> The fix is to remove the unnecessary netif_tx_disable & wake_queue() in the
> netvsc_linkstatus_callback().
> 
> Reported-by: Richard Genoud <richard.genoud@...il.com>
> Tested-by: Long Li <longli@...rosoft.com>
> Tested-by: Richard Genoud <richard.genoud@...il.com>
> Signed-off-by: Haiyang Zhang <haiyangz@...rosoft.com>
> Reviewed-by: K. Y. Srinivasan <kys@...rosoft.com>

Applied.
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