rtlwifi: rtl8192cu: Fix problem that prevents reassociation

The driver was failing to clear the BSSID when a disconnect happened. That
prevented a reconnection. This problem is reported at
https://bugzilla.redhat.com/show_bug.cgi?id=789605,
https://bugzilla.redhat.com/show_bug.cgi?id=866786,
https://bugzilla.redhat.com/show_bug.cgi?id=906734, and
https://bugzilla.kernel.org/show_bug.cgi?id=46171.

Thanks to Jussi Kivilinna for making the critical observation
that led to the solution.

Reported-by: Jussi Kivilinna <jussi.kivilinna@iki.fi>
Tested-by: Jussi Kivilinna <jussi.kivilinna@iki.fi>
Tested-by: Alessandro Lannocca <alessandro.lannocca@gmail.com>
Signed-off-by: Larry Finger <Larry.Finger@lwfinger.net>
Cc: Stable <stable@vger.kernel.org>
Signed-off-by: John W. Linville <linville@tuxdriver.com>

diff --git a/drivers/net/wireless/rtlwifi/rtl8192cu/hw.c b/drivers/net/wireless/rtlwifi/rtl8192cu/hw.c
index 3c6e18c..c08d0f4 100644 (file)
--- a/drivers/net/wireless/rtlwifi/rtl8192cu/hw.c
+++ b/drivers/net/wireless/rtlwifi/rtl8192cu/hw.c
@@ -1377,74 +1377,57 @@ void rtl92cu_card_disable(struct ieee80211_hw *hw)
 
 void rtl92cu_set_check_bssid(struct ieee80211_hw *hw, bool check_bssid)
 {
-       /* dummy routine needed for callback from rtl_op_configure_filter() */
-}
-
-/*========================================================================== */
-
-static void _rtl92cu_set_check_bssid(struct ieee80211_hw *hw,
-                             enum nl80211_iftype type)
-{
        struct rtl_priv *rtlpriv = rtl_priv(hw);
-       u32 reg_rcr = rtl_read_dword(rtlpriv, REG_RCR);
        struct rtl_hal *rtlhal = rtl_hal(rtlpriv);
-       struct rtl_phy *rtlphy = &(rtlpriv->phy);
-       u8 filterout_non_associated_bssid = false;
+       u32 reg_rcr = rtl_read_dword(rtlpriv, REG_RCR);
 
-       switch (type) {
-       case NL80211_IFTYPE_ADHOC:
-       case NL80211_IFTYPE_STATION:
-               filterout_non_associated_bssid = true;
-               break;
-       case NL80211_IFTYPE_UNSPECIFIED:
-       case NL80211_IFTYPE_AP:
-       default:
-               break;
-       }
-       if (filterout_non_associated_bssid) {
+       if (rtlpriv->psc.rfpwr_state != ERFON)
+               return;
+
+       if (check_bssid) {
+               u8 tmp;
                if (IS_NORMAL_CHIP(rtlhal->version)) {
-                       switch (rtlphy->current_io_type) {
-                       case IO_CMD_RESUME_DM_BY_SCAN:
-                               reg_rcr |= (RCR_CBSSID_DATA | RCR_CBSSID_BCN);
-                               rtlpriv->cfg->ops->set_hw_reg(hw,
-                                                HW_VAR_RCR, (u8 *)(&reg_rcr));
-                               /* enable update TSF */
-                               _rtl92cu_set_bcn_ctrl_reg(hw, 0, BIT(4));
-                               break;
-                       case IO_CMD_PAUSE_DM_BY_SCAN:
-                               reg_rcr &= ~(RCR_CBSSID_DATA | RCR_CBSSID_BCN);
-                               rtlpriv->cfg->ops->set_hw_reg(hw,
-                                                HW_VAR_RCR, (u8 *)(&reg_rcr));
-                               /* disable update TSF */
-                               _rtl92cu_set_bcn_ctrl_reg(hw, BIT(4), 0);
-                               break;
-                       }
+                       reg_rcr |= (RCR_CBSSID_DATA | RCR_CBSSID_BCN);
+                       tmp = BIT(4);
                } else {
-                       reg_rcr |= (RCR_CBSSID);
-                       rtlpriv->cfg->ops->set_hw_reg(hw, HW_VAR_RCR,
-                                                     (u8 *)(&reg_rcr));
-                       _rtl92cu_set_bcn_ctrl_reg(hw, 0, (BIT(4)|BIT(5)));
+                       reg_rcr |= RCR_CBSSID;
+                       tmp = BIT(4) | BIT(5);
                }
-       } else if (filterout_non_associated_bssid == false) {
+               rtlpriv->cfg->ops->set_hw_reg(hw, HW_VAR_RCR,
+                                             (u8 *) (&reg_rcr));
+               _rtl92cu_set_bcn_ctrl_reg(hw, 0, tmp);
+       } else {
+               u8 tmp;
                if (IS_NORMAL_CHIP(rtlhal->version)) {
-                       reg_rcr &= (~(RCR_CBSSID_DATA | RCR_CBSSID_BCN));
-                       rtlpriv->cfg->ops->set_hw_reg(hw, HW_VAR_RCR,
-                                                     (u8 *)(&reg_rcr));
-                       _rtl92cu_set_bcn_ctrl_reg(hw, BIT(4), 0);
+                       reg_rcr &= ~(RCR_CBSSID_DATA | RCR_CBSSID_BCN);
+                       tmp = BIT(4);
                } else {
-                       reg_rcr &= (~RCR_CBSSID);
-                       rtlpriv->cfg->ops->set_hw_reg(hw, HW_VAR_RCR,
-                                                     (u8 *)(&reg_rcr));
-                       _rtl92cu_set_bcn_ctrl_reg(hw, (BIT(4)|BIT(5)), 0);
+                       reg_rcr &= ~RCR_CBSSID;
+                       tmp = BIT(4) | BIT(5);
                }
+               reg_rcr &= (~(RCR_CBSSID_DATA | RCR_CBSSID_BCN));
+               rtlpriv->cfg->ops->set_hw_reg(hw,
+                                             HW_VAR_RCR, (u8 *) (&reg_rcr));
+               _rtl92cu_set_bcn_ctrl_reg(hw, tmp, 0);
        }
 }
 
+/*========================================================================== */
+
 int rtl92cu_set_network_type(struct ieee80211_hw *hw, enum nl80211_iftype type)
 {
+       struct rtl_priv *rtlpriv = rtl_priv(hw);
+
        if (_rtl92cu_set_media_status(hw, type))
                return -EOPNOTSUPP;
-       _rtl92cu_set_check_bssid(hw, type);
+
+       if (rtlpriv->mac80211.link_state == MAC80211_LINKED) {
+               if (type != NL80211_IFTYPE_AP)
+                       rtl92cu_set_check_bssid(hw, true);
+       } else {
+               rtl92cu_set_check_bssid(hw, false);
+       }
+
        return 0;
 }