netdev - [PATCH 2/2] net: Detect and ignore netif_stop_queue() calls before register

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Date:	Sat,  6 Nov 2010 17:39:32 +0100
From:	Guillaume Chazarain <guichaz@...il.com>
To:	davem@...emloft.net, netdev@...r.kernel.org
Cc:	Guillaume Chazarain <guichaz@...il.com>
Subject: [PATCH 2/2] net: Detect and ignore netif_stop_queue() calls before register_netdev()

After e6484930d7c73d324bccda7d43d131088da697b9: net: allocate tx queues in register_netdevice
These calls make net drivers oops at load time, so let's avoid people
git-bisect'ing known problems.

Signed-off-by: Guillaume Chazarain <guichaz@...il.com>
---
 include/linux/netdevice.h |    5 +++++
 1 files changed, 5 insertions(+), 0 deletions(-)

diff --git a/include/linux/netdevice.h b/include/linux/netdevice.h
index 072652d..d8fd2c2 100644
--- a/include/linux/netdevice.h
+++ b/include/linux/netdevice.h
@@ -1554,6 +1554,11 @@ static inline void netif_tx_wake_all_queues(struct net_device *dev)
 
 static inline void netif_tx_stop_queue(struct netdev_queue *dev_queue)
 {
+	if (WARN_ON(!dev_queue)) {
+		printk(KERN_INFO "netif_stop_queue() cannot be called before "
+		       "register_netdev()");
+		return;
+	}
 	set_bit(__QUEUE_STATE_XOFF, &dev_queue->state);
 }
 
-- 
1.7.1

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