rtlwifi: Use mutex to replace spin_lock to protect IPS and LPS

Enter/leavel IPS and LPS are large critical section, and they can't use
sleep function because running in atomic-context, which own a spin_lock.
In commit ba9f93f82aba ("rtlwifi: Fix enter/exit power_save"), it moves
LPS functions to thread-context, so this commit can simply change LPS's
spin lock to mutex.
Considering IPS functions, rtl_ips_nic_on() may be called by TX tasklet
(softirq-context) that check whether packet is auth frame. Fortunately,
current mac80211 will ask driver to leave IPS using op_config with
changed flag IEEE80211_CONF_CHANGE_IDLE, before issuing auth frame, so
IPS functions can run in thread-context and use mutex to protect critical
section, too.
Also, this commit removes some useless spin locks.

Signed-off-by: Ping-Ke Shih <pkshih@realtek.com>
Signed-off-by: Kalle Valo <kvalo@codeaurora.org>

4 files changed, 14 insertions, 27 deletions

diff --git a/drivers/net/wireless/realtek/rtlwifi/base.c b/drivers/net/wireless/realtek/rtlwifi/base.c
index 0ba9c0cc95e1..89ec318598ea 100644
--- a/drivers/net/wireless/realtek/rtlwifi/base.c
+++ b/drivers/net/wireless/realtek/rtlwifi/base.c
@@ -551,7 +551,8 @@ int rtl_init_core(struct ieee80211_hw *hw)
 
         /* <4> locks */
         mutex_init(&rtlpriv->locks.conf_mutex);
-        spin_lock_init(&rtlpriv->locks.ips_lock);
+        mutex_init(&rtlpriv->locks.ips_mutex);
+        mutex_init(&rtlpriv->locks.lps_mutex);
         spin_lock_init(&rtlpriv->locks.irq_th_lock);
         spin_lock_init(&rtlpriv->locks.h2c_lock);
         spin_lock_init(&rtlpriv->locks.rf_ps_lock);
@@ -561,9 +562,7 @@ int rtl_init_core(struct ieee80211_hw *hw)
         spin_lock_init(&rtlpriv->locks.c2hcmd_lock);
         spin_lock_init(&rtlpriv->locks.scan_list_lock);
         spin_lock_init(&rtlpriv->locks.cck_and_rw_pagea_lock);
-        spin_lock_init(&rtlpriv->locks.check_sendpkt_lock);
         spin_lock_init(&rtlpriv->locks.fw_ps_lock);
-        spin_lock_init(&rtlpriv->locks.lps_lock);
         spin_lock_init(&rtlpriv->locks.iqk_lock);
         /* <5> init list */
         INIT_LIST_HEAD(&rtlpriv->entry_list);
@@ -1229,7 +1228,6 @@ bool rtl_tx_mgmt_proc(struct ieee80211_hw *hw, struct sk_buff *skb)
         }
         if (ieee80211_is_auth(fc)) {
                 RT_TRACE(rtlpriv, COMP_SEND, DBG_DMESG, "MAC80211_LINKING\n");
-                rtl_ips_nic_on(hw);
 
                 mac->link_state = MAC80211_LINKING;
                 /* Dul mac */
diff --git a/drivers/net/wireless/realtek/rtlwifi/ps.c b/drivers/net/wireless/realtek/rtlwifi/ps.c
index 24c87fae5382..6a4008845f49 100644
--- a/drivers/net/wireless/realtek/rtlwifi/ps.c
+++ b/drivers/net/wireless/realtek/rtlwifi/ps.c
@@ -289,7 +289,7 @@ void rtl_ips_nic_on(struct ieee80211_hw *hw)
 
         cancel_delayed_work(&rtlpriv->works.ips_nic_off_wq);
 
-        spin_lock(&rtlpriv->locks.ips_lock);
+        mutex_lock(&rtlpriv->locks.ips_mutex);
         if (ppsc->inactiveps) {
                 rtstate = ppsc->rfpwr_state;
 
@@ -306,7 +306,7 @@ void rtl_ips_nic_on(struct ieee80211_hw *hw)
                                                                         ppsc->inactive_pwrstate);
                 }
         }
-        spin_unlock(&rtlpriv->locks.ips_lock);
+        mutex_unlock(&rtlpriv->locks.ips_mutex);
 }
 EXPORT_SYMBOL_GPL(rtl_ips_nic_on);
 
@@ -415,7 +415,6 @@ static void rtl_lps_enter_core(struct ieee80211_hw *hw)
         struct rtl_mac *mac = rtl_mac(rtl_priv(hw));
         struct rtl_ps_ctl *ppsc = rtl_psc(rtl_priv(hw));
         struct rtl_priv *rtlpriv = rtl_priv(hw);
-        unsigned long flag;
 
         if (!ppsc->fwctrl_lps)
                 return;
@@ -436,7 +435,7 @@ static void rtl_lps_enter_core(struct ieee80211_hw *hw)
         if (mac->link_state != MAC80211_LINKED)
                 return;
 
-        spin_lock_irqsave(&rtlpriv->locks.lps_lock, flag);
+        mutex_lock(&rtlpriv->locks.lps_mutex);
 
         /* Don't need to check (ppsc->dot11_psmode == EACTIVE), because
          * bt_ccoexist may ask to enter lps.
@@ -446,7 +445,7 @@ static void rtl_lps_enter_core(struct ieee80211_hw *hw)
                  "Enter 802.11 power save mode...\n");
         rtl_lps_set_psmode(hw, EAUTOPS);
 
-        spin_unlock_irqrestore(&rtlpriv->locks.lps_lock, flag);
+        mutex_unlock(&rtlpriv->locks.lps_mutex);
 }
 
 /* Interrupt safe routine to leave the leisure power save mode.*/
@@ -455,9 +454,8 @@ static void rtl_lps_leave_core(struct ieee80211_hw *hw)
         struct rtl_priv *rtlpriv = rtl_priv(hw);
         struct rtl_ps_ctl *ppsc = rtl_psc(rtl_priv(hw));
         struct rtl_hal *rtlhal = rtl_hal(rtl_priv(hw));
-        unsigned long flag;
 
-        spin_lock_irqsave(&rtlpriv->locks.lps_lock, flag);
+        mutex_lock(&rtlpriv->locks.lps_mutex);
 
         if (ppsc->fwctrl_lps) {
                 if (ppsc->dot11_psmode != EACTIVE) {
@@ -478,7 +476,7 @@ static void rtl_lps_leave_core(struct ieee80211_hw *hw)
                         rtl_lps_set_psmode(hw, EACTIVE);
                 }
         }
-        spin_unlock_irqrestore(&rtlpriv->locks.lps_lock, flag);
+        mutex_unlock(&rtlpriv->locks.lps_mutex);
 }
 
 /* For sw LPS*/
@@ -568,7 +566,6 @@ void rtl_swlps_rf_awake(struct ieee80211_hw *hw)
         struct rtl_priv *rtlpriv = rtl_priv(hw);
         struct rtl_ps_ctl *ppsc = rtl_psc(rtl_priv(hw));
         struct rtl_mac *mac = rtl_mac(rtl_priv(hw));
-        unsigned long flag;
 
         if (!rtlpriv->psc.swctrl_lps)
                 return;
@@ -581,9 +578,9 @@ void rtl_swlps_rf_awake(struct ieee80211_hw *hw)
                 RT_CLEAR_PS_LEVEL(ppsc, RT_PS_LEVEL_ASPM);
         }
 
-        spin_lock_irqsave(&rtlpriv->locks.lps_lock, flag);
+        mutex_lock(&rtlpriv->locks.lps_mutex);
         rtl_ps_set_rf_state(hw, ERFON, RF_CHANGE_BY_PS);
-        spin_unlock_irqrestore(&rtlpriv->locks.lps_lock, flag);
+        mutex_unlock(&rtlpriv->locks.lps_mutex);
 }
 
 void rtl_swlps_rfon_wq_callback(void *data)
@@ -600,7 +597,6 @@ void rtl_swlps_rf_sleep(struct ieee80211_hw *hw)
         struct rtl_priv *rtlpriv = rtl_priv(hw);
         struct rtl_mac *mac = rtl_mac(rtl_priv(hw));
         struct rtl_ps_ctl *ppsc = rtl_psc(rtl_priv(hw));
-        unsigned long flag;
         u8 sleep_intv;
 
         if (!rtlpriv->psc.sw_ps_enabled)
@@ -624,9 +620,9 @@ void rtl_swlps_rf_sleep(struct ieee80211_hw *hw)
         }
         spin_unlock(&rtlpriv->locks.rf_ps_lock);
 
-        spin_lock_irqsave(&rtlpriv->locks.lps_lock, flag);
+        mutex_lock(&rtlpriv->locks.lps_mutex);
         rtl_ps_set_rf_state(hw, ERFSLEEP, RF_CHANGE_BY_PS);
-        spin_unlock_irqrestore(&rtlpriv->locks.lps_lock, flag);
+        mutex_unlock(&rtlpriv->locks.lps_mutex);
 
         if (ppsc->reg_rfps_level & RT_RF_OFF_LEVL_ASPM &&
             !RT_IN_PS_LEVEL(ppsc, RT_PS_LEVEL_ASPM)) {
diff --git a/drivers/net/wireless/realtek/rtlwifi/usb.c b/drivers/net/wireless/realtek/rtlwifi/usb.c
index 39b033b3b53a..ce3103bb8ebb 100644
--- a/drivers/net/wireless/realtek/rtlwifi/usb.c
+++ b/drivers/net/wireless/realtek/rtlwifi/usb.c
@@ -962,7 +962,6 @@ static void _rtl_usb_tx_preprocess(struct ieee80211_hw *hw,
         memset(&tcb_desc, 0, sizeof(struct rtl_tcb_desc));
         if (ieee80211_is_auth(fc)) {
                 RT_TRACE(rtlpriv, COMP_SEND, DBG_DMESG, "MAC80211_LINKING\n");
-                rtl_ips_nic_on(hw);
         }
 
         if (rtlpriv->psc.sw_ps_enabled) {
diff --git a/drivers/net/wireless/realtek/rtlwifi/wifi.h b/drivers/net/wireless/realtek/rtlwifi/wifi.h
index 0b1c54381a2f..941694060f48 100644
--- a/drivers/net/wireless/realtek/rtlwifi/wifi.h
+++ b/drivers/net/wireless/realtek/rtlwifi/wifi.h
@@ -2325,17 +2325,14 @@ struct rtl_hal_cfg {
 struct rtl_locks {
         /* mutex */
         struct mutex conf_mutex;
-        struct mutex ps_mutex;
+        struct mutex ips_mutex; /* mutex for enter/leave IPS */
+        struct mutex lps_mutex; /* mutex for enter/leave LPS */
 
         /*spin lock */
-        spinlock_t ips_lock;
         spinlock_t irq_th_lock;
-        spinlock_t irq_pci_lock;
-        spinlock_t tx_lock;
         spinlock_t h2c_lock;
         spinlock_t rf_ps_lock;
         spinlock_t rf_lock;
-        spinlock_t lps_lock;
         spinlock_t waitq_lock;
         spinlock_t entry_list_lock;
         spinlock_t usb_lock;
@@ -2348,9 +2345,6 @@ struct rtl_locks {
         /*Dual mac*/
         spinlock_t cck_and_rw_pagea_lock;
 
-        /*Easy concurrent*/
-        spinlock_t check_sendpkt_lock;
-
         spinlock_t iqk_lock;
 };