When a driver rejects a frame in it's ->tx() callback, it must also
stop queues, otherwise mac80211 can go into a loop here. Detect this
situation and abort the loop after five retries, warning about the
driver bug.
Signed-off-by: Johannes Berg <johannes@xxxxxxxxxxxxxxxx>
---
v2: Michael suggested to use WARN_ON_ONCE instead
net/mac80211/tx.c | 9 ++++++++-
1 file changed, 8 insertions(+), 1 deletion(-)
--- everything.orig/net/mac80211/tx.c 2008-06-15 14:19:10.000000000 +0200
+++ everything/net/mac80211/tx.c 2008-06-15 14:53:52.000000000 +0200
@@ -1091,7 +1091,7 @@ static int ieee80211_tx(struct net_devic
struct ieee80211_tx_data tx;
ieee80211_tx_result res = TX_DROP, res_prepare;
struct ieee80211_tx_info *info = IEEE80211_SKB_CB(skb);
- int ret, i;
+ int ret, i, retries = 0;
u16 queue;
queue = skb_get_queue_mapping(skb);
@@ -1189,6 +1189,13 @@ retry:
*/
if (!__netif_subqueue_stopped(local->mdev, queue)) {
clear_bit(queue, local->queues_pending);
+ retries++;
+ /*
+ * Driver bug, it's rejecting packets but
+ * not stopping queues.
+ */
+ if (WARN_ON_ONCE(retries > 5))
+ goto drop;
goto retry;
}
store->skb = skb;
--
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