netdev - [PATCH] net: introduce netdev_change

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Message-Id: <20110507132217.0938E13A6A@rere.qmqm.pl>
Date:	Sat,  7 May 2011 15:22:17 +0200 (CEST)
From:	Michał Mirosław <mirq-linux@...e.qmqm.pl>
To:	netdev@...r.kernel.org
Subject: [PATCH] net: introduce netdev_change_features()

It will be needed by bonding and other drivers changing vlan_features
after ndo_init callback.

As a bonus, this includes kernel-doc for netdev_update_features().

Signed-off-by: Michał Mirosław <mirq-linux@...e.qmqm.pl>
---
 include/linux/netdevice.h |    1 +
 net/core/dev.c            |   25 +++++++++++++++++++++++++
 2 files changed, 26 insertions(+), 0 deletions(-)

diff --git a/include/linux/netdevice.h b/include/linux/netdevice.h
index d5de66a..686af72 100644
--- a/include/linux/netdevice.h
+++ b/include/linux/netdevice.h
@@ -2560,6 +2560,7 @@ u32 netdev_increment_features(u32 all, u32 one, u32 mask);
 u32 netdev_fix_features(struct net_device *dev, u32 features);
 int __netdev_update_features(struct net_device *dev);
 void netdev_update_features(struct net_device *dev);
+void netdev_change_features(struct net_device *dev);
 
 void netif_stacked_transfer_operstate(const struct net_device *rootdev,
 					struct net_device *dev);
diff --git a/net/core/dev.c b/net/core/dev.c
index 44ef8f8..c91d14c 100644
--- a/net/core/dev.c
+++ b/net/core/dev.c
@@ -5287,6 +5287,14 @@ int __netdev_update_features(struct net_device *dev)
 	return 1;
 }
 
+/**
+ *	netdev_update_features - recalculate device features
+ *	@dev: the device to check
+ *
+ *	Recalculate dev->features set and send notifications if it
+ *	has changed. Should be called after driver or hardware dependent
+ *	conditions might have changed that influence the features.
+ */
 void netdev_update_features(struct net_device *dev)
 {
 	if (__netdev_update_features(dev))
@@ -5295,6 +5303,23 @@ void netdev_update_features(struct net_device *dev)
 EXPORT_SYMBOL(netdev_update_features);
 
 /**
+ *	netdev_change_features - recalculate device features
+ *	@dev: the device to check
+ *
+ *	Recalculate dev->features set and send notifications even
+ *	if they have not changed. Should be called instead of
+ *	netdev_update_features() if also dev->vlan_features might
+ *	have changed to allow the changes to be propagated to stacked
+ *	VLAN devices.
+ */
+void netdev_change_features(struct net_device *dev)
+{
+	__netdev_update_features(dev);
+	netdev_features_change(dev);
+}
+EXPORT_SYMBOL(netdev_change_features);
+
+/**
  *	netif_stacked_transfer_operstate -	transfer operstate
  *	@rootdev: the root or lower level device to transfer state from
  *	@dev: the device to transfer operstate to
-- 
1.7.2.5

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