Re: rtl8192cu gets confused when scan is aborted by bringing interface down (Re: rtl8192cu goes silent/dead after some time...)

[Larry Finger <Larry.Finger@lwfinger.net>]

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On 03/11/2013 04:06 PM, Jussi Kivilinna wrote:
>
> Scan appearently is not necessary, 'ifconfig wlan0 up & sleep 0.02; ifconfig
> wlan0 down' is enough. Just doing 'ifconfig wlan0 up; ifconfig wlan0 down' is
> enough.
>
> I also tested with monitor interface opened for tcpdump while doing 'ifconfig
> up&down' on wlan0 and still triggered the issue. Then turning wlan0 up resulted
> monitor interface only receiving probe requests from nearby devices.

I am in the middle of a long-term test of rtl8192ce, which keeps me from running 
tests of rtl8192cu, but I noticed something strange. Does the attached patch 
help? It is compile tested.

Larry


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Index: linux-2.6/drivers/net/wireless/rtlwifi/rtl8192cu/hw.c
===================================================================
--- linux-2.6.orig/drivers/net/wireless/rtlwifi/rtl8192cu/hw.c
+++ linux-2.6/drivers/net/wireless/rtlwifi/rtl8192cu/hw.c
@@ -1377,7 +1377,23 @@ void rtl92cu_card_disable(struct ieee802
 
 void rtl92cu_set_check_bssid(struct ieee80211_hw *hw, bool check_bssid)
 {
-	/* dummy routine needed for callback from rtl_op_configure_filter() */
+	struct rtl_priv *rtlpriv = rtl_priv(hw);
+	u32 reg_rcr = rtl_read_dword(rtlpriv, REG_RCR);
+
+	if (rtlpriv->psc.rfpwr_state != ERFON)
+		return;
+
+	if (check_bssid) {
+		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, 0, BIT(4));
+	} else if (!check_bssid) {
+		reg_rcr &= (~(RCR_CBSSID_DATA | RCR_CBSSID_BCN));
+		_rtl92cu_set_bcn_ctrl_reg(hw, BIT(4), 0);
+		rtlpriv->cfg->ops->set_hw_reg(hw,
+					      HW_VAR_RCR, (u8 *) (&reg_rcr));
+	}
 }
 
 /*========================================================================== */