net, wireless: overwrite default_ethtool_ops

[ Upstream commit d07d7507bfb4e23735c9b83e397c43e1e8a173e8 ]

Since:

commit 2c60db037034d27f8c636403355d52872da92f81
Author: Eric Dumazet <edumazet@google.com>
Date:   Sun Sep 16 09:17:26 2012 +0000

    net: provide a default dev->ethtool_ops

wireless core does not correctly assign ethtool_ops.

After alloc_netdev*() call, some cfg80211 drivers provide they own
ethtool_ops, but some do not. For them, wireless core provide generic
cfg80211_ethtool_ops, which is assigned in NETDEV_REGISTER notify call:

        if (!dev->ethtool_ops)
                dev->ethtool_ops = &cfg80211_ethtool_ops;

But after Eric's commit, dev->ethtool_ops is no longer NULL (on cfg80211
drivers without custom ethtool_ops), but points to &default_ethtool_ops.

In order to fix the problem, provide function which will overwrite
default_ethtool_ops and use it by wireless core.

Signed-off-by: Stanislaw Gruszka <sgruszka@redhat.com>
Acked-by: Johannes Berg <johannes@sipsolutions.net>
Acked-by: Ben Hutchings <bhutchings@solarflare.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

diff --git a/include/linux/netdevice.h b/include/linux/netdevice.h
index a848ffc327f4f19e3b1da926f52aa361fd27b654..825fb7e3d7daf0b691a58fe03ef9820afa808a9b 100644 (file)
--- a/include/linux/netdevice.h
+++ b/include/linux/netdevice.h
@@ -60,6 +60,9 @@ struct wireless_dev;
 #define SET_ETHTOOL_OPS(netdev,ops) \
        ( (netdev)->ethtool_ops = (ops) )
 
+extern void netdev_set_default_ethtool_ops(struct net_device *dev,
+                                          const struct ethtool_ops *ops);
+
 /* hardware address assignment types */
 #define NET_ADDR_PERM          0       /* address is permanent (default) */
 #define NET_ADDR_RANDOM                1       /* address is generated randomly */

diff --git a/net/core/dev.c b/net/core/dev.c
index e5942bf45a6d9b7e7412a2100b7ef116610aab65..347079489634da2c522930f4b375e973335775c8 100644 (file)
--- a/net/core/dev.c
+++ b/net/core/dev.c
@@ -6012,6 +6012,14 @@ struct netdev_queue *dev_ingress_queue_create(struct net_device *dev)
 
 static const struct ethtool_ops default_ethtool_ops;
 
+void netdev_set_default_ethtool_ops(struct net_device *dev,
+                                   const struct ethtool_ops *ops)
+{
+       if (dev->ethtool_ops == &default_ethtool_ops)
+               dev->ethtool_ops = ops;
+}
+EXPORT_SYMBOL_GPL(netdev_set_default_ethtool_ops);
+
 /**
  *     alloc_netdev_mqs - allocate network device
  *     @sizeof_priv:   size of private data to allocate space for

diff --git a/net/wireless/core.c b/net/wireless/core.c
index 3f72530520883ae4aa510516bf7a4ce641c646d8..d1531e58e195188083fe4a35051a1e3d4e93805e 100644 (file)
--- a/net/wireless/core.c
+++ b/net/wireless/core.c
@@ -856,8 +856,7 @@ static int cfg80211_netdev_notifier_call(struct notifier_block *nb,
                /* allow mac80211 to determine the timeout */
                wdev->ps_timeout = -1;
 
-               if (!dev->ethtool_ops)
-                       dev->ethtool_ops = &cfg80211_ethtool_ops;
+               netdev_set_default_ethtool_ops(dev, &cfg80211_ethtool_ops);
 
                if ((wdev->iftype == NL80211_IFTYPE_STATION ||
                     wdev->iftype == NL80211_IFTYPE_P2P_CLIENT ||