Commit 681c4d07 authored by Johannes Berg's avatar Johannes Berg Committed by John W. Linville
Browse files

mac80211: fix lockdep warning



Since the introduction of the fixes for the
reorder timer, mac80211 will cause lockdep
warnings because lockdep confuses
local->skb_queue and local->rx_skb_queue
and treats their lock as the same.

However, their locks are different, and are
valid in different contexts (the former is
used in IRQ context, the latter in BH only)
and the only thing to be done is mark the
former as a different lock class so that
lockdep can tell the difference.
Reported-by: default avatarLarry Finger <Larry.Finger@lwfinger.net>
Reported-by: default avatarSujith <m.sujith@gmail.com>
Reported-by: default avatarMiles Lane <miles.lane@gmail.com>
Tested-by: default avatarSujith <m.sujith@gmail.com>
Tested-by: default avatarJohannes Berg <johannes.berg@intel.com>
Signed-off-by: default avatarJohannes Berg <johannes.berg@intel.com>
Signed-off-by: default avatarJohn W. Linville <linville@tuxdriver.com>
parent 8d661f1e
......@@ -39,6 +39,8 @@ module_param(ieee80211_disable_40mhz_24ghz, bool, 0644);
MODULE_PARM_DESC(ieee80211_disable_40mhz_24ghz,
"Disable 40MHz support in the 2.4GHz band");
static struct lock_class_key ieee80211_rx_skb_queue_class;
void ieee80211_configure_filter(struct ieee80211_local *local)
{
u64 mc;
......@@ -569,7 +571,15 @@ struct ieee80211_hw *ieee80211_alloc_hw(size_t priv_data_len,
spin_lock_init(&local->filter_lock);
spin_lock_init(&local->queue_stop_reason_lock);
skb_queue_head_init(&local->rx_skb_queue);
/*
* The rx_skb_queue is only accessed from tasklets,
* but other SKB queues are used from within IRQ
* context. Therefore, this one needs a different
* locking class so our direct, non-irq-safe use of
* the queue's lock doesn't throw lockdep warnings.
*/
skb_queue_head_init_class(&local->rx_skb_queue,
&ieee80211_rx_skb_queue_class);
INIT_DELAYED_WORK(&local->scan_work, ieee80211_scan_work);
......
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