From b169f877f001a474fb89939842c390518160bcc5 Mon Sep 17 00:00:00 2001 From: Zong-Zhe Yang Date: Mon, 14 Mar 2022 15:12:43 +0800 Subject: [PATCH] rtw89: ser: fix CAM leaks occurring in L2 reset The CAM, meaning address CAM and bssid CAM here, will get leaks during SER (system error recover) L2 reset process and ieee80211_restart_hw() which is called by L2 reset process eventually. The normal flow would be like -> add interface (acquire 1) -> enter ips (release 1) -> leave ips (acquire 1) -> connection (occupy 1) <(A) 1 leak after L2 reset if non-sec connection> The ieee80211_restart_hw() flow (under connection) -> ieee80211 reconfig -> add interface (acquire 1) -> leave ips (acquire 1) -> connection (occupy (A) + 2) <(B) 1 more leak> Originally, CAM is released before HW restart only if connection is under security. Now, release CAM whatever connection it is to fix leak in (A). OTOH, check if CAM is already valid to avoid acquiring multiple times to fix (B). Besides, if AP mode, release address CAM of all stations before HW restart. Signed-off-by: Zong-Zhe Yang Signed-off-by: Ping-Ke Shih Signed-off-by: Kalle Valo Link: https://lore.kernel.org/r/20220314071250.40292-2-pkshih@realtek.com --- drivers/net/wireless/realtek/rtw89/cam.c | 14 ++++++++++++-- drivers/net/wireless/realtek/rtw89/ser.c | 21 +++++++++++++++++++++ 2 files changed, 33 insertions(+), 2 deletions(-) diff --git a/drivers/net/wireless/realtek/rtw89/cam.c b/drivers/net/wireless/realtek/rtw89/cam.c index 305dbbe..26bef9f 100644 --- a/drivers/net/wireless/realtek/rtw89/cam.c +++ b/drivers/net/wireless/realtek/rtw89/cam.c @@ -421,10 +421,8 @@ static void rtw89_cam_reset_key_iter(struct ieee80211_hw *hw, void *data) { struct rtw89_dev *rtwdev = (struct rtw89_dev *)data; - struct rtw89_vif *rtwvif = (struct rtw89_vif *)vif->drv_priv; rtw89_cam_sec_key_del(rtwdev, vif, sta, key, false); - rtw89_cam_deinit(rtwdev, rtwvif); } void rtw89_cam_deinit_addr_cam(struct rtw89_dev *rtwdev, @@ -480,6 +478,12 @@ int rtw89_cam_init_addr_cam(struct rtw89_dev *rtwdev, int i; int ret; + if (unlikely(addr_cam->valid)) { + rtw89_debug(rtwdev, RTW89_DBG_FW, + "addr cam is already valid; skip init\n"); + return 0; + } + ret = rtw89_cam_get_avail_addr_cam(rtwdev, &addr_cam_idx); if (ret) { rtw89_err(rtwdev, "failed to get available addr cam\n"); @@ -531,6 +535,12 @@ static int rtw89_cam_init_bssid_cam(struct rtw89_dev *rtwdev, u8 bssid_cam_idx; int ret; + if (unlikely(bssid_cam->valid)) { + rtw89_debug(rtwdev, RTW89_DBG_FW, + "bssid cam is already valid; skip init\n"); + return 0; + } + ret = rtw89_cam_get_avail_bssid_cam(rtwdev, &bssid_cam_idx); if (ret) { rtw89_err(rtwdev, "failed to get available bssid cam\n"); diff --git a/drivers/net/wireless/realtek/rtw89/ser.c b/drivers/net/wireless/realtek/rtw89/ser.c index 837cdc3..e86f3d8 100644 --- a/drivers/net/wireless/realtek/rtw89/ser.c +++ b/drivers/net/wireless/realtek/rtw89/ser.c @@ -220,11 +220,32 @@ static void ser_reset_vif(struct rtw89_dev *rtwdev, struct rtw89_vif *rtwvif) rtwvif->trigger = false; } +static void ser_sta_deinit_addr_cam_iter(void *data, struct ieee80211_sta *sta) +{ + struct rtw89_dev *rtwdev = (struct rtw89_dev *)data; + struct rtw89_sta *rtwsta = (struct rtw89_sta *)sta->drv_priv; + + rtw89_cam_deinit_addr_cam(rtwdev, &rtwsta->addr_cam); +} + +static void ser_deinit_cam(struct rtw89_dev *rtwdev, struct rtw89_vif *rtwvif) +{ + if (rtwvif->net_type == RTW89_NET_TYPE_AP_MODE) + ieee80211_iterate_stations_atomic(rtwdev->hw, + ser_sta_deinit_addr_cam_iter, + rtwdev); + + rtw89_cam_deinit(rtwdev, rtwvif); +} + static void ser_reset_mac_binding(struct rtw89_dev *rtwdev) { struct rtw89_vif *rtwvif; rtw89_cam_reset_keys(rtwdev); + rtw89_for_each_rtwvif(rtwdev, rtwvif) + ser_deinit_cam(rtwdev, rtwvif); + rtw89_core_release_all_bits_map(rtwdev->mac_id_map, RTW89_MAX_MAC_ID_NUM); rtw89_for_each_rtwvif(rtwdev, rtwvif) ser_reset_vif(rtwdev, rtwvif); -- 2.7.4