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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 ba9f93f82a ("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>
This commit is contained in:
Ping-Ke Shih 2018-01-17 14:15:21 +08:00 committed by Kalle Valo
parent 98051872fd
commit a3fa3669d1
4 changed files with 14 additions and 27 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

6
drivers/net/wireless/realtek/rtlwifi/base.c
View File

@ -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 */

24
drivers/net/wireless/realtek/rtlwifi/ps.c
View File

@ -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)) {

1
drivers/net/wireless/realtek/rtlwifi/usb.c
View File

@ -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) {

10
drivers/net/wireless/realtek/rtlwifi/wifi.h
View File

@ -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;
};