nl80211: Avoid AP mode BUG_ON hang with invalid lock assert

"cfg80211: add assert_cfg80211_lock() to ensure proper protection"
added assert_cfg80211_lock() calls into various places. At least
one of them, nl80211_send_wiphy(), should not have been there. That
triggers the BUG_ON in assert_cfg80211_lock() and pretty much kills
the kernel whenever someone runs hostapd.. Remove that call and make
assert_cfg80211_lock() use WARN_ON instead of BUG_ON to be a bit more
friendly to users.

Signed-off-by: Jouni Malinen <jouni.malinen@atheros.com>
Acked-by: Johannes Berg <johannes@sipsolutions.net>
Signed-off-by: John W. Linville <linville@tuxdriver.com>

diff --git a/net/wireless/core.h b/net/wireless/core.h
index cd8e6e3..f6c53f5 100644 (file)
--- a/net/wireless/core.h
+++ b/net/wireless/core.h
@@ -76,7 +76,7 @@ extern struct list_head cfg80211_drv_list;
 
 static inline void assert_cfg80211_lock(void)
 {
-       BUG_ON(!mutex_is_locked(&cfg80211_mutex));
+       WARN_ON(!mutex_is_locked(&cfg80211_mutex));
 }
 
 /*

diff --git a/net/wireless/nl80211.c b/net/wireless/nl80211.c
index 97f69be..531bb67 100644 (file)
--- a/net/wireless/nl80211.c
+++ b/net/wireless/nl80211.c
@@ -137,8 +137,6 @@ static int nl80211_send_wiphy(struct sk_buff *msg, u32 pid, u32 seq, int flags,
        int i;
        u16 ifmodes = dev->wiphy.interface_modes;
 
-       assert_cfg80211_lock();
-
        hdr = nl80211hdr_put(msg, pid, seq, flags, NL80211_CMD_NEW_WIPHY);
        if (!hdr)
                return -1;