2013-03-13 18:07:53

by Larry Finger

Subject: [PATCH V2 for 3.9] 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 <[email protected]>
Tested-by: Jussi Kivilinna <[email protected]>
Tested-by: Alessandro Lannocca <[email protected]>
Signed-off-by: Larry Finger <[email protected]>
Cc: Stable <[email protected]>
---

V2 - removed some changes that were left in by mistake

---
John,

As you can see by the number of bug reports, this patch should be
pushed as soon as possible.

Thanks,

Larry
---

hw.c | 87 ++++++++++++++++++++++++++-----------------------------------------
1 file changed, 35 insertions(+), 52 deletions(-)

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
@@ -1377,74 +1377,57 @@ 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() */
-}
-
-/*========================================================================== */
-
-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;
}