We disassociate only in cfg80211 and upper layers when direct probe
timed out. Mac80211 is not aware about connection problem until
ieee80211_sta_connection_lost() and operate in associate mode. If in
this time window, upper layers decide to change channel we can observe
warnings like below:
WARNING: at include/net/mac80211.h:3081 rate_control_send_low+0x8b/0x10f [mac80211]()
Call Trace:
<IRQ> [<ffffffff81054c2e>] warn_slowpath_common+0x83/0x9b
[<ffffffff81054c60>] warn_slowpath_null+0x1a/0x1c
[<ffffffffa025d5ff>] rate_control_send_low+0x8b/0x10f [mac80211]
[<ffffffffa02ab306>] rs_get_rate+0x138/0x215 [iwlagn]
[<ffffffffa025d993>] rate_control_get_rate+0x86/0x14c [mac80211]
[<ffffffffa0265f18>] invoke_tx_handlers+0x829/0xe7d [mac80211]
[<ffffffff8124bbf9>] ? swiotlb_unmap_page+0x9/0xb
[<ffffffffa02bfc93>] ? pci_unmap_single+0x54/0x5b [iwlagn]
[<ffffffffa02665d1>] ieee80211_tx+0x65/0x90 [mac80211]
[<ffffffffa026675b>] ieee80211_xmit+0x15f/0x16e [mac80211]
[<ffffffff813cfdd4>] ? __alloc_skb+0x8d/0x133
[<ffffffffa02671cc>] ieee80211_tx_skb+0x56/0x5e [mac80211]
[<ffffffffa02547ea>] ieee80211_send_bar+0xda/0xe9 [mac80211]
[<ffffffffa024f5cf>] ieee80211_tx_status+0x1e1/0x706 [mac80211]
[<ffffffff8148867c>] ? _raw_spin_unlock_irqrestore+0x17/0x19
[<ffffffffa024eb5b>] ieee80211_tasklet_handler+0x5b/0xa8 [mac80211]
WARNING: at include/net/mac80211.h:3081 rate_control_send_low+0x8b/0x10f [mac80211]()
Call Trace:
[<ffffffff81054c8e>] warn_slowpath_common+0x83/0x9b
[<ffffffff81054cc0>] warn_slowpath_null+0x1a/0x1c
[<ffffffffa0248627>] rate_control_send_low+0x8b/0x10f [mac80211]
[<ffffffffa029d306>] rs_get_rate+0x138/0x215 [iwlagn]
[<ffffffffa02489bb>] rate_control_get_rate+0x86/0x14c [mac80211]
[<ffffffffa0250f2c>] invoke_tx_handlers+0x829/0xe7d [mac80211]
[<ffffffffa02515e5>] ieee80211_tx+0x65/0x90 [mac80211]
[<ffffffffa025176f>] ieee80211_xmit+0x15f/0x16e [mac80211]
[<ffffffff813cf834>] ? __alloc_skb+0x8d/0x133
[<ffffffffa02521e0>] ieee80211_tx_skb+0x56/0x5e [mac80211]
[<ffffffffa023ef74>] ieee80211_send_delba+0x136/0x145 [mac80211]
[<ffffffffa0240062>] ___ieee80211_stop_rx_ba_session+0xdc/0x10e [mac80211]
[<ffffffffa02400e5>] __ieee80211_stop_rx_ba_session+0x51/0x68 [mac80211]
[<ffffffffa023fc01>] ? ieee80211_start_tx_ba_cb+0x5b/0xd2 [mac80211]
[<ffffffffa023ece5>] ieee80211_sta_tear_down_BA_sessions+0x50/0x5d [mac80211]
[<ffffffffa0241be7>] ieee80211_set_disassoc+0xd1/0x1ee [mac80211]
[<ffffffffa0241eb0>] ieee80211_sta_connection_lost+0x45/0x98 [mac80211]
[<ffffffffa024450a>] ieee80211_sta_work+0x119/0x12c [mac80211]
[<ffffffffa0247003>] ieee80211_iface_work+0x2af/0x2d2 [mac80211]
Lukasz, who can reproduce these warnings when switching between APs
confirmed patch fixes the problem in his setup.
Reported-and-tested-by: Lukasz Jagiello <jagiello.lukasz@xxxxxxxxx>
Cc: stable@xxxxxxxxxxxxxxx # 3.0+
Signed-off-by: Stanislaw Gruszka <sgruszka@xxxxxxxxxx>
---
Ccing to 3.0+ stable only because warnings showed up after update
to that kernel version. Even if problem existed before, it for some
reason did not manifest itself.
v1 -> v2 change order, first do mac80211 disassociate
net/mac80211/mlme.c | 10 ++++++++--
1 files changed, 8 insertions(+), 2 deletions(-)
diff --git a/net/mac80211/mlme.c b/net/mac80211/mlme.c
index 57fb58f..5147f38 100644
--- a/net/mac80211/mlme.c
+++ b/net/mac80211/mlme.c
@@ -2379,8 +2379,14 @@ ieee80211_probe_auth_done(struct ieee80211_work *wk,
struct sk_buff *skb)
{
struct ieee80211_local *local = wk->sdata->local;
+ struct ieee80211_if_managed *ifmgd = &wk->sdata->u.mgd;
if (!skb) {
+ mutex_lock(&ifmgd->mtx);
+ if (ifmgd->associated)
+ ieee80211_set_disassoc(wk->sdata, true, false);
+ mutex_unlock(&ifmgd->mtx);
+
cfg80211_send_auth_timeout(wk->sdata->dev, wk->filter_ta);
goto destroy;
}
@@ -2390,9 +2396,9 @@ ieee80211_probe_auth_done(struct ieee80211_work *wk,
goto destroy;
}
- mutex_lock(&wk->sdata->u.mgd.mtx);
+ mutex_lock(&ifmgd->mtx);
ieee80211_rx_mgmt_probe_resp(wk->sdata, skb);
- mutex_unlock(&wk->sdata->u.mgd.mtx);
+ mutex_unlock(&ifmgd->mtx);
wk->type = IEEE80211_WORK_AUTH;
wk->probe_auth.tries = 0;
--
1.7.1
--
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