netdev - [PATCH] net: fix hw_features ethtool_ops->set

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Message-Id: <20110421231232.BF22613909@rere.qmqm.pl>
Date:	Fri, 22 Apr 2011 01:12:32 +0200 (CEST)
From:	Michał Mirosław <mirq-linux@...e.qmqm.pl>
To:	netdev@...r.kernel.org
Cc:	Ben Hutchings <bhutchings@...arflare.com>,
	Eric Dumazet <eric.dumazet@...il.com>,
	Vladislav Zolotarov <vladz@...adcom.com>,
	Eilon Greenstein <eilong@...adcom.com>
Subject: [PATCH] net: fix hw_features ethtool_ops->set_flags compatibility

Signed-off-by: Michał Mirosław <mirq-linux@...e.qmqm.pl>
---
 net/core/ethtool.c |    5 +++--
 1 files changed, 3 insertions(+), 2 deletions(-)

diff --git a/net/core/ethtool.c b/net/core/ethtool.c
index 13d79f5..a8c5b3e 100644
--- a/net/core/ethtool.c
+++ b/net/core/ethtool.c
@@ -532,7 +532,7 @@ static int ethtool_set_one_feature(struct net_device *dev,
 
 int __ethtool_set_flags(struct net_device *dev, u32 data)
 {
-	u32 changed;
+	u32 changed, forced;
 
 	if (data & ~flags_dup_features)
 		return -EINVAL;
@@ -546,7 +546,8 @@ int __ethtool_set_flags(struct net_device *dev, u32 data)
 	}
 
 	/* allow changing only bits set in hw_features */
-	changed = (data ^ dev->wanted_features) & flags_dup_features;
+	forced = dev->features & flags_dup_features & ~dev->hw_features;
+	changed = data ^ forced ^ dev->wanted_features;
 	if (changed & ~dev->hw_features)
 		return (changed & dev->hw_features) ? -EINVAL : -EOPNOTSUPP;
 
-- 
1.7.2.5

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