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| author | Johannes Berg <johannes@sipsolutions.net> | 2007-04-26 20:50:35 -0700 |
|---|---|---|
| committer | David S. Miller <davem@davemloft.net> | 2007-04-26 20:50:35 -0700 |
| commit | a4d73ee168eeaed3baea86542ad42e1fd7e192d3 (patch) | |
| tree | c00fcd6915a2d92ecd15589566bbeb2d908ae87a /net/wireless/core.c | |
| parent | b86e0280bb5585a610783ff5392d9d439dee7ddd (diff) | |
| download | linux-a4d73ee168eeaed3baea86542ad42e1fd7e192d3.tar.gz linux-a4d73ee168eeaed3baea86542ad42e1fd7e192d3.tar.bz2 linux-a4d73ee168eeaed3baea86542ad42e1fd7e192d3.zip | |
[WIRELESS] cfg80211: Fix locking in wiphy_new.
This patch fixes the locking in wiphy new. Ingo Oeser
<netdev@axxeo.de> noticed that locking in the error case was wrong and
also suggested this fix.
Signed-off-by: Johannes Berg <johannes@sipsolutions.net>
Signed-off-by: John W. Linville <linville@tuxdriver.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
Diffstat (limited to 'net/wireless/core.c')
| -rw-r--r-- | net/wireless/core.c | 16 |
1 files changed, 10 insertions, 6 deletions
diff --git a/net/wireless/core.c b/net/wireless/core.c index 532e1e09e028..24a21add0ba6 100644 --- a/net/wireless/core.c +++ b/net/wireless/core.c @@ -53,21 +53,25 @@ struct wiphy *wiphy_new(struct cfg80211_ops *ops, int sizeof_priv) mutex_lock(&cfg80211_drv_mutex); - if (unlikely(wiphy_counter<0)) { + drv->idx = wiphy_counter; + + /* now increase counter for the next device unless + * it has wrapped previously */ + if (wiphy_counter >= 0) + wiphy_counter++; + + mutex_unlock(&cfg80211_drv_mutex); + + if (unlikely(drv->idx < 0)) { /* ugh, wrapped! */ kfree(drv); return NULL; } - drv->idx = wiphy_counter; /* give it a proper name */ snprintf(drv->wiphy.dev.bus_id, BUS_ID_SIZE, PHY_NAME "%d", drv->idx); - /* now increase counter for the next time */ - wiphy_counter++; - mutex_unlock(&cfg80211_drv_mutex); - mutex_init(&drv->mtx); mutex_init(&drv->devlist_mtx); INIT_LIST_HEAD(&drv->netdev_list); |