netdev - [PATCH 1/2] netpoll: warning for ndo_start_xmit returns with interrupts enabled

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Message-Id: <1250861616.24178.20.camel@dengdd-desktop>
Date:	Fri, 21 Aug 2009 21:33:36 +0800
From:	DDD <Dongdong.deng@...driver.com>
To:	Matt Mackall <mpm@...enic.com>, David Miller <davem@...emloft.net>,
	Nicolas Pitre <nico@....org>
Cc:	lkml <linux-kernel@...r.kernel.org>, netdev@...r.kernel.org,
	Jason Wessel <jason.wessel@...driver.com>
Subject: [PATCH 1/2] netpoll: warning for ndo_start_xmit returns with
	interrupts enabled

WARN_ONCE for ndo_start_xmit() enable interrupts in netpoll_send_skb(),
because the NETPOLL API requires that interrupts remain disabled in
netpoll_send_skb().

Signed-off-by: Dongdong Deng <dongdong.deng@...driver.com>
---
 net/core/netpoll.c |    5 +++++
 1 files changed, 5 insertions(+), 0 deletions(-)

diff --git a/net/core/netpoll.c b/net/core/netpoll.c
index df30feb..1b76eb1 100644
--- a/net/core/netpoll.c
+++ b/net/core/netpoll.c
@@ -319,6 +319,11 @@ static void netpoll_send_skb(struct netpoll *np, struct sk_buff *skb)
 
 			udelay(USEC_PER_POLL);
 		}
+
+		WARN_ONCE(!irqs_disabled(),
+			"netpoll_send_skb(): %s enabled interrupts in poll (%pF)\n",
+			dev->name, ops->ndo_start_xmit);
+
 		local_irq_restore(flags);
 	}
 
-- 
1.6.0.4


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