netdev - [PATCH] bridge: fix OOPS when bridging device without ethtool

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Message-ID: <20070830082932.71272c3d@freepuppy.rosehill.hemminger.net>
Date:	Thu, 30 Aug 2007 08:29:32 -0700
From:	Stephen Hemminger <shemminger@...ux-foundation.org>
To:	"David S. Miller" <davem@...emloft.net>
Cc:	Matthew Wilcox <matthew@....cx>,
	Johannes Berg <johannes@...solutions.net>,
	Jochen Voss <voss@...huhn.de>,
	linux wireless list <linux-wireless@...r.kernel.org>,
	linville@...driver.com, netdev <netdev@...r.kernel.org>,
	bridge@...ux-foundation.org
Subject: [PATCH] bridge: fix OOPS when bridging device without ethtool

Bridge code calls ethtool to get speed. The conversion to using
only ethtool_ops broke the case of devices without ethtool_ops.
This is a new regression in 2.6.23.

Rearranged the switch to a logical order, and use gcc initializer.

Ps: speed should have been part of the network device structure from
    the start rather than burying it in ethtool.

Signed-off-by: Stephen Hemminger <shemminger@...ux-foundation.org>


--- a/net/bridge/br_if.c	2007-08-30 07:49:01.000000000 -0700
+++ b/net/bridge/br_if.c	2007-08-30 07:48:16.000000000 -0700
@@ -33,17 +33,17 @@
  */
 static int port_cost(struct net_device *dev)
 {
-	if (dev->ethtool_ops->get_settings) {
-		struct ethtool_cmd ecmd = { ETHTOOL_GSET };
-		int err = dev->ethtool_ops->get_settings(dev, &ecmd);
-		if (!err) {
+	if (dev->ethtool_ops && dev->ethtool_ops->get_settings) {
+		struct ethtool_cmd ecmd = { .cmd = ETHTOOL_GSET, };
+
+		if (!dev->ethtool_ops->get_settings(dev, &ecmd)) {
 			switch(ecmd.speed) {
-			case SPEED_100:
-				return 19;
-			case SPEED_1000:
-				return 4;
 			case SPEED_10000:
 				return 2;
+			case SPEED_1000:
+				return 4;
+			case SPEED_100:
+				return 19;
 			case SPEED_10:
 				return 100;
 			}
-
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