3.16.35-rc1 review patch. If anyone has any objections, please let me know.
------------------
From: Michal Kazior <michal.kazior@xxxxxxxxx>
commit cf44012810ccdd8fd947518e965cb04b7b8498be upstream.
The ieee80211_queue_stopped() expects hw queue
number but it was given raw WMM AC number instead.
This could cause frame drops and problems with
traffic in some cases - most notably if driver
doesn't map AC numbers to queue numbers 1:1 and
uses ieee80211_stop_queues() and
ieee80211_wake_queue() only without ever calling
ieee80211_wake_queues().
On ath10k it was possible to hit this problem in
the following case:
1. wlan0 uses queue 0
(ath10k maps queues per vif)
2. offchannel uses queue 15
3. queues 1-14 are unused
4. ieee80211_stop_queues()
5. ieee80211_wake_queue(q=0)
6. ieee80211_wake_queue(q=15)
(other queues are not woken up because both
driver and mac80211 know other queues are
unused)
7. ieee80211_rx_h_mesh_fwding()
8. ieee80211_select_queue_80211() returns 2
9. ieee80211_queue_stopped(q=2) returns true
10. frame is dropped (oops!)
Fixes: d3c1597b8d1b ("mac80211: fix forwarded mesh frame queue mapping")
Signed-off-by: Michal Kazior <michal.kazior@xxxxxxxxx>
Signed-off-by: Johannes Berg <johannes.berg@xxxxxxxxx>
Signed-off-by: Ben Hutchings <ben@xxxxxxxxxxxxxxx>
---
net/mac80211/rx.c | 5 +++--
1 file changed, 3 insertions(+), 2 deletions(-)
--- a/net/mac80211/rx.c
+++ b/net/mac80211/rx.c
@@ -2058,7 +2058,7 @@ ieee80211_rx_h_mesh_fwding(struct ieee80
struct ieee80211_sub_if_data *sdata = rx->sdata;
struct ieee80211_rx_status *status = IEEE80211_SKB_RXCB(skb);
struct ieee80211_if_mesh *ifmsh = &sdata->u.mesh;
- u16 q, hdrlen;
+ u16 ac, q, hdrlen;
hdr = (struct ieee80211_hdr *) skb->data;
hdrlen = ieee80211_hdrlen(hdr->frame_control);
@@ -2128,7 +2128,8 @@ ieee80211_rx_h_mesh_fwding(struct ieee80
ether_addr_equal(sdata->vif.addr, hdr->addr3))
return RX_CONTINUE;
- q = ieee80211_select_queue_80211(sdata, skb, hdr);
+ ac = ieee80211_select_queue_80211(sdata, skb, hdr);
+ q = sdata->vif.hw_queue[ac];
if (ieee80211_queue_stopped(&local->hw, q)) {
IEEE80211_IFSTA_MESH_CTR_INC(ifmsh, dropped_frames_congestion);
return RX_DROP_MONITOR;
--
To unsubscribe from this list: send the line "unsubscribe stable" in
the body of a message to majordomo@xxxxxxxxxxxxxxx
More majordomo info at http://vger.kernel.org/majordomo-info.html