[PATCH 4.17 087/336] qtnfmac: fix invalid STA state on EAPOL failure

[Greg Kroah-Hartman]

4.17-stable review patch.  If anyone has any objections, please let me know.

------------------

From: Sergey Matyukevich <sergey.matyukevich...@quantenna.com>

[ Upstream commit 480daa9cb62c14bbd1b87a01cd9bc10cc56dbf32 ]

Driver switches vif sta_state into QTNF_STA_CONNECTING when cfg80211
core initiates connect procedure. Further this state is changed either
to QTNF_STA_CONNECTED or to QTNF_STA_DISCONNECTED by BSS_JOIN and
BSS_LEAVE events from firmware. However it is possible that no such
events will be sent by firmware, e.g. if EAPOL timed out.

In this case vif sta_mode will remain in QTNF_STA_CONNECTING state and
all subsequent connection attempts will fail with -EBUSY error code.
Fix this by perfroming STA state transition from QTNF_STA_CONNECTING
to QTNF_STA_DISCONNECTED in cfg80211 disconnect callback.
No need to rely upon firmware events in this case.

Signed-off-by: Sergey Matyukevich <sergey.matyukevich...@quantenna.com>
Signed-off-by: Kalle Valo <kv...@codeaurora.org>
Signed-off-by: Sasha Levin <alexander.le...@microsoft.com>
Signed-off-by: Greg Kroah-Hartman <gre...@linuxfoundation.org>
---
 drivers/net/wireless/quantenna/qtnfmac/cfg80211.c |   21 ++++++++++++++-------
 drivers/net/wireless/quantenna/qtnfmac/event.c    |    8 +++-----
 2 files changed, 17 insertions(+), 12 deletions(-)

--- a/drivers/net/wireless/quantenna/qtnfmac/cfg80211.c
+++ b/drivers/net/wireless/quantenna/qtnfmac/cfg80211.c
@@ -651,28 +651,35 @@ qtnf_disconnect(struct wiphy *wiphy, str
 {
        struct qtnf_wmac *mac = wiphy_priv(wiphy);
        struct qtnf_vif *vif;
-       int ret;
+       int ret = 0;
 
        vif = qtnf_mac_get_base_vif(mac);
        if (!vif) {
                pr_err("MAC%u: primary VIF is not configured\n", mac->macid);
-               return -EFAULT;
+               ret = -EFAULT;
+               goto out;
        }
 
-       if (vif->wdev.iftype != NL80211_IFTYPE_STATION)
-               return -EOPNOTSUPP;
+       if (vif->wdev.iftype != NL80211_IFTYPE_STATION) {
+               ret = -EOPNOTSUPP;
+               goto out;
+       }
 
        if (vif->sta_state == QTNF_STA_DISCONNECTED)
-               return 0;
+               goto out;
 
        ret = qtnf_cmd_send_disconnect(vif, reason_code);
        if (ret) {
                pr_err("VIF%u.%u: failed to disconnect\n", mac->macid,
                       vif->vifid);
-               return ret;
+               goto out;
        }
 
-       return 0;
+out:
+       if (vif->sta_state == QTNF_STA_CONNECTING)
+               vif->sta_state = QTNF_STA_DISCONNECTED;
+
+       return ret;
 }
 
 static int
--- a/drivers/net/wireless/quantenna/qtnfmac/event.c
+++ b/drivers/net/wireless/quantenna/qtnfmac/event.c
@@ -198,11 +198,9 @@ qtnf_event_handle_bss_leave(struct qtnf_
                return -EPROTO;
        }
 
-       if (vif->sta_state != QTNF_STA_CONNECTED) {
-               pr_err("VIF%u.%u: BSS_LEAVE event when STA is not connected\n",
-                      vif->mac->macid, vif->vifid);
-               return -EPROTO;
-       }
+       if (vif->sta_state != QTNF_STA_CONNECTED)
+               pr_warn("VIF%u.%u: BSS_LEAVE event when STA is not connected\n",
+                       vif->mac->macid, vif->vifid);
 
        pr_debug("VIF%u.%u: disconnected\n", vif->mac->macid, vif->vifid);