mac80211: Stop TX BA session if buf_size is zero
If we receive an ADDBA response with status code 0 and a buf_size of 0
we should stop the TX BA session as otherwise we'll end up queuing
frames in ieee80211_tx_prep_agg forever instead of sending them out as
non AMPDUs.
This fixes a problem with AVM Fritz Stick N wireless devices where
frames to this device are not transmitted anymore by mac80211.
Signed-off-by: Helmut Schaa <helmut.schaa@googlemail.com>
Acked-by: Johannes Berg <johannes@sipsolutions.net>
Signed-off-by: John W. Linville <linville@tuxdriver.com>
diff --git a/net/mac80211/agg-tx.c b/net/mac80211/agg-tx.c
index c8be8ef..b7075f3 100644
--- a/net/mac80211/agg-tx.c
+++ b/net/mac80211/agg-tx.c
@@ -777,18 +777,14 @@
#ifdef CONFIG_MAC80211_HT_DEBUG
printk(KERN_DEBUG "switched off addBA timer for tid %d\n", tid);
#endif
-
+ /*
+ * IEEE 802.11-2007 7.3.1.14:
+ * In an ADDBA Response frame, when the Status Code field
+ * is set to 0, the Buffer Size subfield is set to a value
+ * of at least 1.
+ */
if (le16_to_cpu(mgmt->u.action.u.addba_resp.status)
- == WLAN_STATUS_SUCCESS) {
- /*
- * IEEE 802.11-2007 7.3.1.14:
- * In an ADDBA Response frame, when the Status Code field
- * is set to 0, the Buffer Size subfield is set to a value
- * of at least 1.
- */
- if (!buf_size)
- goto out;
-
+ == WLAN_STATUS_SUCCESS && buf_size) {
if (test_and_set_bit(HT_AGG_STATE_RESPONSE_RECEIVED,
&tid_tx->state)) {
/* ignore duplicate response */