cfg80211/mac80211: use debugfs_remove_recursive

We can save a lot of code and pointers in the structs
by using debugfs_remove_recursive().

First, change cfg80211 to use debugfs_remove_recursive()
so that drivers do not need to clean up any files they
added to the per-wiphy debugfs (if and only if they are
ok to be accessed until after wiphy_unregister!).

Then also make mac80211 use debugfs_remove_recursive()
where necessary -- it need not remove per-wiphy files
as cfg80211 now removes those, but netdev etc. files
still need to be handled but can now be removed without
needing struct dentry pointers to all of them.

Signed-off-by: Johannes Berg <johannes@sipsolutions.net>
Signed-off-by: John W. Linville <linville@tuxdriver.com>

4 files changed, 2 insertions, 30 deletions

diff --git a/net/wireless/core.c b/net/wireless/core.c
index 07252967be9c..02835172b227 100644
--- a/net/wireless/core.c
+++ b/net/wireless/core.c
@@ -546,7 +546,7 @@ void wiphy_unregister(struct wiphy *wiphy)
 	 * First remove the hardware from everywhere, this makes
 	 * it impossible to find from userspace.
 	 */
-	cfg80211_debugfs_rdev_del(rdev);
+	debugfs_remove_recursive(rdev->wiphy.debugfsdir);
 	list_del(&rdev->list);
 
 	/*
@@ -569,7 +569,6 @@ void wiphy_unregister(struct wiphy *wiphy)
 
 	cfg80211_rdev_list_generation++;
 	device_del(&rdev->wiphy.dev);
-	debugfs_remove(rdev->wiphy.debugfsdir);
 
 	mutex_unlock(&cfg80211_mutex);
 
diff --git a/net/wireless/core.h b/net/wireless/core.h
index 68b321997d4c..5aeebb9085f8 100644
--- a/net/wireless/core.h
+++ b/net/wireless/core.h
@@ -72,17 +72,6 @@ struct cfg80211_registered_device {
 	/* current channel */
 	struct ieee80211_channel *channel;
 
-#ifdef CONFIG_CFG80211_DEBUGFS
-	/* Debugfs entries */
-	struct wiphy_debugfsdentries {
-		struct dentry *rts_threshold;
-		struct dentry *fragmentation_threshold;
-		struct dentry *short_retry_limit;
-		struct dentry *long_retry_limit;
-		struct dentry *ht40allow_map;
-	} debugfs;
-#endif
-
 	/* must be last because of the way we do wiphy_priv(),
 	 * and it should at least be aligned to NETDEV_ALIGN */
 	struct wiphy wiphy __attribute__((__aligned__(NETDEV_ALIGN)));
diff --git a/net/wireless/debugfs.c b/net/wireless/debugfs.c
index 13d93d84f902..2e4895615037 100644
--- a/net/wireless/debugfs.c
+++ b/net/wireless/debugfs.c
@@ -104,11 +104,7 @@ static const struct file_operations ht40allow_map_ops = {
 };
 
 #define DEBUGFS_ADD(name)						\
-	rdev->debugfs.name = debugfs_create_file(#name, S_IRUGO, phyd,	\
-						  &rdev->wiphy, &name## _ops);
-#define DEBUGFS_DEL(name)						\
-	debugfs_remove(rdev->debugfs.name);				\
-	rdev->debugfs.name = NULL;
+	debugfs_create_file(#name, S_IRUGO, phyd, &rdev->wiphy, &name## _ops);
 
 void cfg80211_debugfs_rdev_add(struct cfg80211_registered_device *rdev)
 {
@@ -120,12 +116,3 @@ void cfg80211_debugfs_rdev_add(struct cfg80211_registered_device *rdev)
 	DEBUGFS_ADD(long_retry_limit);
 	DEBUGFS_ADD(ht40allow_map);
 }
-
-void cfg80211_debugfs_rdev_del(struct cfg80211_registered_device *rdev)
-{
-	DEBUGFS_DEL(rts_threshold);
-	DEBUGFS_DEL(fragmentation_threshold);
-	DEBUGFS_DEL(short_retry_limit);
-	DEBUGFS_DEL(long_retry_limit);
-	DEBUGFS_DEL(ht40allow_map);
-}
diff --git a/net/wireless/debugfs.h b/net/wireless/debugfs.h
index 6419b6d6ce3e..74fdd3811427 100644
--- a/net/wireless/debugfs.h
+++ b/net/wireless/debugfs.h
@@ -3,12 +3,9 @@
 
 #ifdef CONFIG_CFG80211_DEBUGFS
 void cfg80211_debugfs_rdev_add(struct cfg80211_registered_device *rdev);
-void cfg80211_debugfs_rdev_del(struct cfg80211_registered_device *rdev);
 #else
 static inline
 void cfg80211_debugfs_rdev_add(struct cfg80211_registered_device *rdev) {}
-static inline
-void cfg80211_debugfs_rdev_del(struct cfg80211_registered_device *rdev) {}
 #endif
 
 #endif /* __CFG80211_DEBUGFS_H */