This is a note to let you know that I've just added the patch titled rtlwifi: Fix enter/exit power_save to the 4.8-stable tree which can be found at: http://www.kernel.org/git/?p=linux/kernel/git/stable/stable-queue.git;a=summary The filename of the patch is: rtlwifi-fix-enter-exit-power_save.patch and it can be found in the queue-4.8 subdirectory. If you, or anyone else, feels it should not be added to the stable tree, please let <stable@xxxxxxxxxxxxxxx> know about it. >From ba9f93f82abafe2552eac942ebb11c2df4f8dd7f Mon Sep 17 00:00:00 2001 From: Larry Finger <Larry.Finger@xxxxxxxxxxxx> Date: Sat, 26 Nov 2016 14:43:35 -0600 Subject: rtlwifi: Fix enter/exit power_save From: Larry Finger <Larry.Finger@xxxxxxxxxxxx> commit ba9f93f82abafe2552eac942ebb11c2df4f8dd7f upstream. In commit a5ffbe0a1993 ("rtlwifi: Fix scheduling while atomic bug") and commit a269913c52ad ("rtlwifi: Rework rtl_lps_leave() and rtl_lps_enter() to use work queue"), an error was introduced in the power-save routines due to the fact that leaving PS was delayed by the use of a work queue. This problem is fixed by detecting if the enter or leave routines are in interrupt mode. If so, the workqueue is used to place the request. If in normal mode, the enter or leave routines are called directly. Fixes: a269913c52ad ("rtlwifi: Rework rtl_lps_leave() and rtl_lps_enter() to use work queue") Reported-by: Ping-Ke Shih <pkshih@xxxxxxxxxxx> Signed-off-by: Larry Finger <Larry.Finger@xxxxxxxxxxxx> Signed-off-by: Kalle Valo <kvalo@xxxxxxxxxxxxxx> Signed-off-by: Greg Kroah-Hartman <gregkh@xxxxxxxxxxxxxxxxxxx> --- drivers/net/wireless/realtek/rtlwifi/base.c | 8 +++--- drivers/net/wireless/realtek/rtlwifi/core.c | 9 ++----- drivers/net/wireless/realtek/rtlwifi/pci.c | 14 +++------- drivers/net/wireless/realtek/rtlwifi/ps.c | 36 +++++++++++++++++++++------- 4 files changed, 40 insertions(+), 27 deletions(-) --- a/drivers/net/wireless/realtek/rtlwifi/base.c +++ b/drivers/net/wireless/realtek/rtlwifi/base.c @@ -1303,12 +1303,13 @@ EXPORT_SYMBOL_GPL(rtl_action_proc); static void setup_arp_tx(struct rtl_priv *rtlpriv, struct rtl_ps_ctl *ppsc) { + struct ieee80211_hw *hw = rtlpriv->hw; + rtlpriv->ra.is_special_data = true; if (rtlpriv->cfg->ops->get_btc_status()) rtlpriv->btcoexist.btc_ops->btc_special_packet_notify( rtlpriv, 1); - rtlpriv->enter_ps = false; - schedule_work(&rtlpriv->works.lps_change_work); + rtl_lps_leave(hw); ppsc->last_delaylps_stamp_jiffies = jiffies; } @@ -1381,8 +1382,7 @@ u8 rtl_is_special_data(struct ieee80211_ if (is_tx) { rtlpriv->ra.is_special_data = true; - rtlpriv->enter_ps = false; - schedule_work(&rtlpriv->works.lps_change_work); + rtl_lps_leave(hw); ppsc->last_delaylps_stamp_jiffies = jiffies; } --- a/drivers/net/wireless/realtek/rtlwifi/core.c +++ b/drivers/net/wireless/realtek/rtlwifi/core.c @@ -1149,10 +1149,8 @@ static void rtl_op_bss_info_changed(stru } else { mstatus = RT_MEDIA_DISCONNECT; - if (mac->link_state == MAC80211_LINKED) { - rtlpriv->enter_ps = false; - schedule_work(&rtlpriv->works.lps_change_work); - } + if (mac->link_state == MAC80211_LINKED) + rtl_lps_leave(hw); if (ppsc->p2p_ps_info.p2p_ps_mode > P2P_PS_NONE) rtl_p2p_ps_cmd(hw, P2P_PS_DISABLE); mac->link_state = MAC80211_NOLINK; @@ -1430,8 +1428,7 @@ static void rtl_op_sw_scan_start(struct } if (mac->link_state == MAC80211_LINKED) { - rtlpriv->enter_ps = false; - schedule_work(&rtlpriv->works.lps_change_work); + rtl_lps_leave(hw); mac->link_state = MAC80211_LINKED_SCANNING; } else { rtl_ips_nic_on(hw); --- a/drivers/net/wireless/realtek/rtlwifi/pci.c +++ b/drivers/net/wireless/realtek/rtlwifi/pci.c @@ -662,11 +662,9 @@ tx_status_ok: } if (((rtlpriv->link_info.num_rx_inperiod + - rtlpriv->link_info.num_tx_inperiod) > 8) || - (rtlpriv->link_info.num_rx_inperiod > 2)) { - rtlpriv->enter_ps = false; - schedule_work(&rtlpriv->works.lps_change_work); - } + rtlpriv->link_info.num_tx_inperiod) > 8) || + (rtlpriv->link_info.num_rx_inperiod > 2)) + rtl_lps_leave(hw); } static int _rtl_pci_init_one_rxdesc(struct ieee80211_hw *hw, @@ -917,10 +915,8 @@ new_trx_end: } if (((rtlpriv->link_info.num_rx_inperiod + rtlpriv->link_info.num_tx_inperiod) > 8) || - (rtlpriv->link_info.num_rx_inperiod > 2)) { - rtlpriv->enter_ps = false; - schedule_work(&rtlpriv->works.lps_change_work); - } + (rtlpriv->link_info.num_rx_inperiod > 2)) + rtl_lps_leave(hw); skb = new_skb; no_new: if (rtlpriv->use_new_trx_flow) { --- a/drivers/net/wireless/realtek/rtlwifi/ps.c +++ b/drivers/net/wireless/realtek/rtlwifi/ps.c @@ -407,8 +407,8 @@ void rtl_lps_set_psmode(struct ieee80211 } } -/*Enter the leisure power save mode.*/ -void rtl_lps_enter(struct ieee80211_hw *hw) +/* Interrupt safe routine to enter the leisure power save mode.*/ +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)); @@ -444,10 +444,9 @@ void rtl_lps_enter(struct ieee80211_hw * spin_unlock_irqrestore(&rtlpriv->locks.lps_lock, flag); } -EXPORT_SYMBOL(rtl_lps_enter); -/*Leave the leisure power save mode.*/ -void rtl_lps_leave(struct ieee80211_hw *hw) +/* Interrupt safe routine to leave the leisure power save mode.*/ +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)); @@ -477,7 +476,6 @@ void rtl_lps_leave(struct ieee80211_hw * } spin_unlock_irqrestore(&rtlpriv->locks.lps_lock, flag); } -EXPORT_SYMBOL(rtl_lps_leave); /* For sw LPS*/ void rtl_swlps_beacon(struct ieee80211_hw *hw, void *data, unsigned int len) @@ -670,12 +668,34 @@ void rtl_lps_change_work_callback(struct struct rtl_priv *rtlpriv = rtl_priv(hw); if (rtlpriv->enter_ps) - rtl_lps_enter(hw); + rtl_lps_enter_core(hw); else - rtl_lps_leave(hw); + rtl_lps_leave_core(hw); } EXPORT_SYMBOL_GPL(rtl_lps_change_work_callback); +void rtl_lps_enter(struct ieee80211_hw *hw) +{ + struct rtl_priv *rtlpriv = rtl_priv(hw); + + if (!in_interrupt()) + return rtl_lps_enter_core(hw); + rtlpriv->enter_ps = true; + schedule_work(&rtlpriv->works.lps_change_work); +} +EXPORT_SYMBOL_GPL(rtl_lps_enter); + +void rtl_lps_leave(struct ieee80211_hw *hw) +{ + struct rtl_priv *rtlpriv = rtl_priv(hw); + + if (!in_interrupt()) + return rtl_lps_leave_core(hw); + rtlpriv->enter_ps = false; + schedule_work(&rtlpriv->works.lps_change_work); +} +EXPORT_SYMBOL_GPL(rtl_lps_leave); + void rtl_swlps_wq_callback(void *data) { struct rtl_works *rtlworks = container_of_dwork_rtl(data, Patches currently in stable-queue which might be from Larry.Finger@xxxxxxxxxxxx are queue-4.8/rtlwifi-fix-enter-exit-power_save.patch queue-4.8/ssb-fix-error-routine-when-fallback-sprom-fails.patch -- To unsubscribe from this list: send the line "unsubscribe stable" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html