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authorJohannes Berg <johannes@sipsolutions.net>2009-08-07 18:17:38 +0400
committerJohn W. Linville <linville@tuxdriver.com>2009-08-14 17:13:43 +0400
commitf5ea9120be2e5d5c846243416cfdce01d02f5836 (patch)
treecade27e47a90dde79a523598b96a2ebb50770d2f /net/wireless/core.h
parentf401a6f7ede753e56b84025e7d2db0d5ef560ce6 (diff)
downloadlinux-f5ea9120be2e5d5c846243416cfdce01d02f5836.tar.xz
nl80211: add generation number to all dumps
In order for userspace to be able to figure out whether it obtained a consistent snapshot of data or not when using netlink dumps, we need to have a generation number in each dump message that indicates whether the list has changed or not -- its value is arbitrary. This patch adds such a number to all dumps, this needs some mac80211 involvement to keep track of a generation number to start with when adding/removing mesh paths or stations. The wiphy and netdev lists can be fully handled within cfg80211, of course, but generation numbers need to be stored there as well. Signed-off-by: Johannes Berg <johannes@sipsolutions.net> Signed-off-by: John W. Linville <linville@tuxdriver.com>
Diffstat (limited to 'net/wireless/core.h')
-rw-r--r--net/wireless/core.h2
1 files changed, 2 insertions, 0 deletions
diff --git a/net/wireless/core.h b/net/wireless/core.h
index 92e0492b0e4d..639db52eeff7 100644
--- a/net/wireless/core.h
+++ b/net/wireless/core.h
@@ -49,6 +49,7 @@ struct cfg80211_registered_device {
/* associate netdev list */
struct mutex devlist_mtx;
struct list_head netdev_list;
+ int devlist_generation;
/* BSSes/scanning */
spinlock_t bss_lock;
@@ -101,6 +102,7 @@ bool wiphy_idx_valid(int wiphy_idx)
extern struct mutex cfg80211_mutex;
extern struct list_head cfg80211_rdev_list;
+extern int cfg80211_rdev_list_generation;
#define assert_cfg80211_lock() WARN_ON(!mutex_is_locked(&cfg80211_mutex))