diff options
| author | Johannes Berg <johannes@sipsolutions.net> | 2008-02-25 16:27:47 +0100 |
|---|---|---|
| committer | John W. Linville <linville@tuxdriver.com> | 2008-03-06 15:30:47 -0500 |
| commit | 73651ee6396c499ccb59ebc84c9274db01ed026d (patch) | |
| tree | 1d59027cbdaec732f3e1378770cbf7b42b48cd70 /net/mac80211/sta_info.h | |
| parent | d0709a65181beb787ef3f58cfe45536a2bb254c8 (diff) | |
mac80211: split sta_info_add
sta_info_add() has two functions: allocating a station info
structure and inserting it into the hash table/list. Splitting
these two functions allows allocating with GFP_KERNEL in many
places instead of GFP_ATOMIC which is now required by the RCU
protection. Additionally, in many places RCU protection is now
no longer needed at all because between sta_info_alloc() and
sta_info_insert() the caller owns the structure.
This fixes a few race conditions with setting initial flags
and similar, but not all (see comments in ieee80211_sta.c and
cfg.c). More documentation on the existing races will be in
a follow-up patch.
Signed-off-by: Johannes Berg <johannes@sipsolutions.net>
Signed-off-by: John W. Linville <linville@tuxdriver.com>
Diffstat (limited to 'net/mac80211/sta_info.h')
| -rw-r--r-- | net/mac80211/sta_info.h | 17 |
1 files changed, 12 insertions, 5 deletions
diff --git a/net/mac80211/sta_info.h b/net/mac80211/sta_info.h index 787124c253a..3f788228eef 100644 --- a/net/mac80211/sta_info.h +++ b/net/mac80211/sta_info.h @@ -283,12 +283,19 @@ struct sta_info *sta_info_get(struct ieee80211_local *local, u8 *addr); struct sta_info *sta_info_get_by_idx(struct ieee80211_local *local, int idx, struct net_device *dev); /* - * Add a new STA info, must be under RCU read lock - * because otherwise the returned reference isn't - * necessarily valid long enough. + * Create a new STA info, caller owns returned structure + * until sta_info_insert(). */ -struct sta_info *sta_info_add(struct ieee80211_sub_if_data *sdata, - u8 *addr); +struct sta_info *sta_info_alloc(struct ieee80211_sub_if_data *sdata, + u8 *addr, gfp_t gfp); +/* + * Insert STA info into hash table/list, returns zero or a + * -EEXIST if (if the same MAC address is already present). + * + * Calling this without RCU protection makes the caller + * relinquish its reference to @sta. + */ +int sta_info_insert(struct sta_info *sta); /* * Unlink a STA info from the hash table/list. * This can NULL the STA pointer if somebody else |