cfg80211: Fix race in bss timeout

It is quite possible to run into a race in bss timeout where
the drivers see the bss entry just before notifying cfg80211
of a roaming event but it got timed out by the time rdev->event_work
got scehduled from cfg80211_wq. This would result in the following
WARN-ON() along with the failure to notify the user space of
the roaming. The other situation which is happening with ath6kl
that runs into issue is when the driver reports roam to same AP
event where the AP bss entry already got expired. To fix this,
move cfg80211_get_bss() from __cfg80211_roamed() to cfg80211_roamed().

[158645.538384] WARNING: at net/wireless/sme.c:586
__cfg80211_roamed+0xc2/0x1b1()
[158645.538810] Call Trace:
[158645.538838]  [<c1033527>] warn_slowpath_common+0x65/0x7a
[158645.538917]  [<c14cfacf>] ? __cfg80211_roamed+0xc2/0x1b1
[158645.538946]  [<c103354b>] warn_slowpath_null+0xf/0x13
[158645.539055]  [<c14cfacf>] __cfg80211_roamed+0xc2/0x1b1
[158645.539086]  [<c14beb5b>] cfg80211_process_rdev_events+0x153/0x1cc
[158645.539166]  [<c14bd57b>] cfg80211_event_work+0x26/0x36
[158645.539195]  [<c10482ae>] process_one_work+0x219/0x38b
[158645.539273]  [<c14bd555>] ? wiphy_new+0x419/0x419
[158645.539301]  [<c10486cb>] worker_thread+0xf6/0x1bf
[158645.539379]  [<c10485d5>] ? rescuer_thread+0x1b5/0x1b5
[158645.539407]  [<c104b3e2>] kthread+0x62/0x67
[158645.539484]  [<c104b380>] ? __init_kthread_worker+0x42/0x42
[158645.539514]  [<c151309a>] kernel_thread_helper+0x6/0xd

Reported-by: Kalle Valo <kvalo@qca.qualcomm.com>
Signed-off-by: Vasanthakumar Thiagarajan <vthiagar@qca.qualcomm.com>
Signed-off-by: John W. Linville <linville@tuxdriver.com>

1 files changed, 26 insertions, 0 deletions

diff --git a/include/net/cfg80211.h b/include/net/cfg80211.h
index 3de1c39d03e5..150c0ee714c2 100644
--- a/include/net/cfg80211.h
+++ b/include/net/cfg80211.h
@@ -3064,6 +3064,32 @@ void cfg80211_roamed(struct net_device *dev,
                      const u8 *resp_ie, size_t resp_ie_len, gfp_t gfp);
 
 /**
+ * cfg80211_roamed_bss - notify cfg80211 of roaming
+ *
+ * @dev: network device
+ * @bss: entry of bss to which STA got roamed
+ * @req_ie: association request IEs (maybe be %NULL)
+ * @req_ie_len: association request IEs length
+ * @resp_ie: association response IEs (may be %NULL)
+ * @resp_ie_len: assoc response IEs length
+ * @gfp: allocation flags
+ *
+ * This is just a wrapper to notify cfg80211 of roaming event with driver
+ * passing bss to avoid a race in timeout of the bss entry. It should be
+ * called by the underlying driver whenever it roamed from one AP to another
+ * while connected. Drivers which have roaming implemented in firmware
+ * may use this function to avoid a race in bss entry timeout where the bss
+ * entry of the new AP is seen in the driver, but gets timed out by the time
+ * it is accessed in __cfg80211_roamed() due to delay in scheduling
+ * rdev->event_work. In case of any failures, the reference is released
+ * either in cfg80211_roamed_bss() or in __cfg80211_romed(), Otherwise,
+ * it will be released while diconneting from the current bss.
+ */
+void cfg80211_roamed_bss(struct net_device *dev, struct cfg80211_bss *bss,
+                         const u8 *req_ie, size_t req_ie_len,
+                         const u8 *resp_ie, size_t resp_ie_len, gfp_t gfp);
+
+/**
  * cfg80211_disconnected - notify cfg80211 that connection was dropped
  *
  * @dev: network device