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mac80211: fix TX warning 

Emmanuel reported that my previous patches to enable
handing all fragments to drivers at once triggered
the warning that the SKB queue wasn't empty. This is
happening when we actually queue up some frames and
don't hand them to the driver (queues are stopped).

The reason for it is that my code that splices the
frame(s) over to the pending queue didn't re-init
the local queue, so skb_queue_empty() was false. Fix
this by using the _init versions of the splicing.

Also, convert the warning to WARN_ON_ONCE.

Reported-by: Emmanuel Grumbach <emmanuel.grumbach@intel.com>
Signed-off-by: Johannes Berg <johannes.berg@intel.com>
Tested-by: Emmanuel Grumbach <emmanuel.grumbach@intel.com>
Signed-off-by: John W. Linville <linville@tuxdriver.com>
This commit is contained in:
Johannes Berg 2011-11-24 14:47:36 +01:00 committed by John W. Linville
parent 4883993841
commit 4db4e0a17f
1 changed files with 4 additions and 3 deletions
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7
net/mac80211/tx.c
View File

@ -1227,9 +1227,10 @@ static bool ieee80211_tx_frags(struct ieee80211_local *local,
* queue is woken again.
*/
if (txpending)
skb_queue_splice(skbs, &local->pending[q]);
skb_queue_splice_init(skbs, &local->pending[q]);
else
skb_queue_splice_tail(skbs, &local->pending[q]);
skb_queue_splice_tail_init(skbs,
&local->pending[q]);
spin_unlock_irqrestore(&local->queue_stop_reason_lock,
flags);
@ -1301,7 +1302,7 @@ static bool __ieee80211_tx(struct ieee80211_local *local,
ieee80211_tpt_led_trig_tx(local, fc, led_len);
ieee80211_led_tx(local, 1);
WARN_ON(!skb_queue_empty(skbs));
WARN_ON_ONCE(!skb_queue_empty(skbs));
return result;
}