netdev - Re: [PATCH 2/3] bnx2: Prevent "scheduling while atomic" warning with cnic, bonding and vlan.

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Message-Id: <20100427.143834.35819121.davem@davemloft.net>
Date:	Tue, 27 Apr 2010 14:38:34 -0700 (PDT)
From:	David Miller <davem@...emloft.net>
To:	mchan@...adcom.com
Cc:	netdev@...r.kernel.org, gospo@...hat.com, jfeeney@...hat.com
Subject: Re: [PATCH 2/3] bnx2: Prevent "scheduling while atomic" warning
 with cnic, bonding and vlan.

From: "Michael Chan" <mchan@...adcom.com>
Date: Tue, 27 Apr 2010 14:28:10 -0700

> The bonding driver calls ndo_vlan_rx_register() while holding bond->lock.
> The bnx2 driver calls bnx2_netif_stop() to stop the rx handling while
> changing the vlgrp.  The call also stops the cnic driver which sleeps
> while the bond->lock is held and cause the warning.
> 
> This code path only needs to stop the NAPI rx handling while we are
> changing the vlgrp.  Since no reset is going to occur, there is no need
> to stop cnic in this case.  By adding a parameter to bnx2_netif_stop()
> to skip stopping cnic, we can avoid the warning.
> 
> Signed-off-by: Michael Chan <mchan@...adcom.com>

Applied to net-2.6
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