Merge git://git.kernel.org/pub/scm/linux/kernel/git/davem/net-2.6

* git://git.kernel.org/pub/scm/linux/kernel/git/davem/net-2.6: (1232 commits)
  iucv: Fix bad merging.
  net_sched: Add size table for qdiscs
  net_sched: Add accessor function for packet length for qdiscs
  net_sched: Add qdisc_enqueue wrapper
  highmem: Export totalhigh_pages.
  ipv6 mcast: Omit redundant address family checks in ip6_mc_source().
  net: Use standard structures for generic socket address structures.
  ipv6 netns: Make several "global" sysctl variables namespace aware.
  netns: Use net_eq() to compare net-namespaces for optimization.
  ipv6: remove unused macros from net/ipv6.h
  ipv6: remove unused parameter from ip6_ra_control
  tcp: fix kernel panic with listening_get_next
  tcp: Remove redundant checks when setting eff_sacks
  tcp: options clean up
  tcp: Fix MD5 signatures for non-linear skbs
  sctp: Update sctp global memory limit allocations.
  sctp: remove unnecessary byteshifting, calculate directly in big-endian
  sctp: Allow only 1 listening socket with SO_REUSEADDR
  sctp: Do not leak memory on multiple listen() calls
  sctp: Support ipv6only AF_INET6 sockets.
  ...

1 files changed, 28 insertions, 5 deletions

diff --git a/net/wireless/core.c b/net/wireless/core.c
index 80afacdae46c..f1da0b93bc56 100644
--- a/net/wireless/core.c
+++ b/net/wireless/core.c
@@ -143,8 +143,11 @@ void cfg80211_put_dev(struct cfg80211_registered_device *drv)
 int cfg80211_dev_rename(struct cfg80211_registered_device *rdev,
 			char *newname)
 {
+	struct cfg80211_registered_device *drv;
 	int idx, taken = -1, result, digits;
 
+	mutex_lock(&cfg80211_drv_mutex);
+
 	/* prohibit calling the thing phy%d when %d is not its number */
 	sscanf(newname, PHY_NAME "%d%n", &idx, &taken);
 	if (taken == strlen(newname) && idx != rdev->idx) {
@@ -156,14 +159,30 @@ int cfg80211_dev_rename(struct cfg80211_registered_device *rdev,
 		 * deny the name if it is phy<idx> where <idx> is printed
 		 * without leading zeroes. taken == strlen(newname) here
 		 */
+		result = -EINVAL;
 		if (taken == strlen(PHY_NAME) + digits)
-			return -EINVAL;
+			goto out_unlock;
+	}
+
+
+	/* Ignore nop renames */
+	result = 0;
+	if (strcmp(newname, dev_name(&rdev->wiphy.dev)) == 0)
+		goto out_unlock;
+
+	/* Ensure another device does not already have this name. */
+	list_for_each_entry(drv, &cfg80211_drv_list, list) {
+		result = -EINVAL;
+		if (strcmp(newname, dev_name(&drv->wiphy.dev)) == 0)
+			goto out_unlock;
 	}
 
-	/* this will check for collisions */
+	/* this will only check for collisions in sysfs
+	 * which is not even always compiled in.
+	 */
 	result = device_rename(&rdev->wiphy.dev, newname);
 	if (result)
-		return result;
+		goto out_unlock;
 
 	if (!debugfs_rename(rdev->wiphy.debugfsdir->d_parent,
 			    rdev->wiphy.debugfsdir,
@@ -172,9 +191,13 @@ int cfg80211_dev_rename(struct cfg80211_registered_device *rdev,
 		printk(KERN_ERR "cfg80211: failed to rename debugfs dir to %s!\n",
 		       newname);
 
-	nl80211_notify_dev_rename(rdev);
+	result = 0;
+out_unlock:
+	mutex_unlock(&cfg80211_drv_mutex);
+	if (result == 0)
+		nl80211_notify_dev_rename(rdev);
 
-	return 0;
+	return result;
 }
 
 /* exported functions */