longli cbc3b6bfd7 Issue: WCSWREL-119 Fix RCU warning when call ieee80211_bss_get_ie ... [Description] [ 179.414989] ============================= [ 179.419033] WARNING: suspicious RCU usage [ 179.428095] 5.11.0-rc1-next-20210104-04456-g31eb08622591 #1 Tainted: G O [ 179.438042] ----------------------------- [ 179.443768] net/wireless/util.c:911 suspicious rcu_dereference_check() usage! [ 179.453802] [ 179.453802] other info that might help us debug this: [ 179.453802] [ 179.463924] [ 179.463924] rcu_scheduler_active = 2, debug_locks = 1 [ 179.472528] 3 locks held by wpa_supplicant/586: [ 179.477109] #0: c18c5058 (cb_lock){++++}-{3:3}, at: genl_rcv+0x14/0x34 [ 179.486226] #1: c18be65c (rtnl_mutex){+.+.}-{3:3}, at: nl80211_pre_doit+0x104/0x1e8 [ 179.496033] #2: c8382da0 (&wdev->mtx){+.+.}-{3:3}, at: nl80211_connect+0x580/0x7ac [ 179.505687] [ 179.505687] stack backtrace: [ 179.511970] CPU: 0 PID: 586 Comm: wpa_supplicant Tainted: G O 5.11.0-rc1-next-20210104-04456-g31eb08622591 #1 [ 179.523233] Hardware name: Freescale i.MX6 SoloX (Device Tree) [ 179.529093] [<c0111814>] (unwind_backtrace) from [<c010bd5c>] (show_stack+0x10/0x14) [ 179.536883] [<c010bd5c>] (show_stack) from [<c0eeae24>] (dump_stack+0xcc/0xf4) [ 179.544142] [<c0eeae24>] (dump_stack) from [<c0ded2b4>] (ieee80211_bss_get_elem+0x84/0x98) [ 179.552443] [<c0ded2b4>] (ieee80211_bss_get_elem) from [<bf0e11bc>] (woal_cfg80211_assoc+0x50c/0x98c [moal]) [ 179.562737] [<bf0e11bc>] (woal_cfg80211_assoc [moal]) from [<bf0e4e2c>] (woal_cfg80211_connect+0x174/0x584 [moal]) [ 179.573748] [<bf0e4e2c>] (woal_cfg80211_connect [moal]) from [<c0e30450>] (cfg80211_connect+0x1d8/0x7fc) [ 179.583590] [<c0e30450>] (cfg80211_connect) from [<c0e02aac>] (nl80211_connect+0x59c/0x7ac) [ 179.591985] [<c0e02aac>] (nl80211_connect) from [<c0c21860>] (genl_rcv_msg+0x174/0x35c) [ 179.600029] [<c0c21860>] (genl_rcv_msg) from [<c0c20960>] (netlink_rcv_skb+0xbc/0x11c) [ 179.607975] [<c0c20960>] (netlink_rcv_skb) from [<c0c20fec>] (genl_rcv+0x20/0x34) [ 179.615486] [<c0c20fec>] (genl_rcv) from [<c0c20004>] (netlink_unicast+0x1ac/0x2e0) [ 179.623173] [<c0c20004>] (netlink_unicast) from [<c0c2030c>] (netlink_sendmsg+0x1d4/0x408) [ 179.631465] [<c0c2030c>] (netlink_sendmsg) from [<c0b9d080>] (____sys_sendmsg+0x1c4/0x274) [ 179.639764] [<c0b9d080>] (____sys_sendmsg) from [<c0b9ee08>] (___sys_sendmsg+0xa4/0xd8) [ 179.647803] [<c0b9ee08>] (___sys_sendmsg) from [<c0b9efe0>] (sys_sendmsg+0x50/0x94) [ 179.655491] [<c0b9efe0>] (sys_sendmsg) from [<c0100080>] (ret_fast_syscall+0x0/0x2c) [ 179.663265] Exception stack(0xc839bfa8 to 0xc839bff0) [ 179.668342] bfa0: 01352b30 01351da0 00000005 bec05770 00000000 00000000 [ 179.676545] bfc0: 01352b30 01351da0 b6f49550 00000128 bec05770 bec057e8 00000001 00000004 [ 179.684744] bfe0: 00000128 bec05720 b6c24bbf b6ba4616 [ 179.718172] wlan: Connected to bssid c0:XX:XX:XX:3e:85 successfully [Analysis] RCU warning is happened at rcu_dereference -> rcu_dereference_check, rcu_read_lock_held() is a condition check in it. When rcu_read_lock_held() return false, warning will be printed. [Fix] When call ieee80211_bss_get_ie(), the code and related ie need be wrapped around by rcu_read_lock()/rcu_read_unlock(). Signed-off-by: longli <li.long@nxp.com> Reviewed-by: Sherry Sun <sherry.sun@nxp.com>		2021-04-26 13:31:53 +08:00
..
wlan_src	Issue: WCSWREL-119 Fix RCU warning when call ieee80211_bss_get_ie	2021-04-26 13:31:53 +08:00
mxmwifi.mk	MA-18646 Build nxp mxmwifi driver out of kernel tree	2021-01-28 18:15:53 +08:00