From 4db4e0a17fb0e7b345b344cde141b252794c2f19 Mon Sep 17 00:00:00 2001 From: Johannes Berg Date: Thu, 24 Nov 2011 14:47:36 +0100 Subject: [PATCH] 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 Signed-off-by: Johannes Berg Tested-by: Emmanuel Grumbach Signed-off-by: John W. Linville --- net/mac80211/tx.c | 7 ++++--- 1 file changed, 4 insertions(+), 3 deletions(-) diff --git a/net/mac80211/tx.c b/net/mac80211/tx.c index 68cbd0095429..6fad8fac3784 100644 --- a/net/mac80211/tx.c +++ b/net/mac80211/tx.c @@ -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; } -- 2.20.1