Introduced in f9f475292dbb0e7035fb6661d1524761ea0888d9
cfg80211_conn_scan() which requires sched_scan_mtx to be held can be called
from cfg80211_conn_work(). Without this we are hitting multiple warnings like
the following:
[ 51.996440] ------------[ cut here ]------------
[ 51.996484] WARNING: at net/wireless/sme.c:88 cfg80211_conn_scan+0x1dc/0x3a0 [cfg80211]()
[ 51.996489] Hardware name: 0578A21
[ 51.996492] Modules linked in: iwldvm mac80211 uvcvideo videobuf2_vmalloc
videobuf2_memops iwlwifi videobuf2_core videodev media cfg80211 ums_realtek
kvm_intel kvm intel_ips r8169 lpc_ich joydev crc32c_intel acpi_cpufreq mperf thinkpad_acpi
[ 51.996533] Pid: 620, comm: kworker/3:1 Not tainted 3.9.0-rc4-next-20130328+ #326
[ 51.996537] Call Trace:
[ 51.996550] [<c1036992>] warn_slowpath_common+0x72/0xa0
[ 51.996583] [<faa4b0ec>] ? cfg80211_conn_scan+0x1dc/0x3a0 [cfg80211]
[ 51.996615] [<faa4b0ec>] ? cfg80211_conn_scan+0x1dc/0x3a0 [cfg80211]
[ 51.996622] [<c10369e2>] warn_slowpath_null+0x22/0x30
[ 51.996654] [<faa4b0ec>] cfg80211_conn_scan+0x1dc/0x3a0 [cfg80211]
[ 51.996662] [<c109076c>] ? __lock_is_held+0x3c/0x60
[ 51.996694] [<faa4b344>] cfg80211_conn_do_work+0x94/0x380 [cfg80211]
[ 51.996700] [<c109175a>] ? __lock_acquire.isra.25+0x38a/0xc80
[ 51.996711] [<c109e679>] ? is_module_text_address+0x19/0x30
[ 51.996720] [<c10577cf>] ? __kernel_text_address+0x4f/0x70
[ 51.996728] [<c10052b1>] ? print_context_stack+0x41/0xd0
[ 51.996763] [<faa4c3b2>] cfg80211_conn_work+0xa2/0x130 [cfg80211]
[ 51.996771] [<c1051858>] process_one_work+0x198/0x450
[ 51.996779] [<c10517d0>] ? process_one_work+0x110/0x450
[ 51.996787] [<c10527c9>] worker_thread+0xf9/0x320
[ 51.996795] [<c10526d0>] ? manage_workers.isra.17+0x260/0x260
[ 51.996803] [<c105a3c4>] kthread+0x94/0xa0
[ 51.996812] [<c1060000>] ? profiling_show+0x10/0x30
[ 51.996823] [<c170c277>] ret_from_kernel_thread+0x1b/0x28
[ 51.996830] [<c105a330>] ? __init_kthread_worker+0x60/0x60
[ 51.996835] ---[ end trace 6c56f7f4ff21820b ]---
Signed-off-by: Artem Savkov <artem.savkov@xxxxxxxxx>
---
net/wireless/sme.c | 2 ++
1 file changed, 2 insertions(+)
diff --git a/net/wireless/sme.c b/net/wireless/sme.c
index 818ad63..a9dc5c7 100644
--- a/net/wireless/sme.c
+++ b/net/wireless/sme.c
@@ -228,6 +228,7 @@ void cfg80211_conn_work(struct work_struct *work)
rtnl_lock();
cfg80211_lock_rdev(rdev);
mutex_lock(&rdev->devlist_mtx);
+ mutex_lock(&rdev->sched_scan_mtx);
list_for_each_entry(wdev, &rdev->wdev_list, list) {
wdev_lock(wdev);
@@ -252,6 +253,7 @@ void cfg80211_conn_work(struct work_struct *work)
wdev_unlock(wdev);
}
+ mutex_unlock(&rdev->sched_scan_mtx);
mutex_unlock(&rdev->devlist_mtx);
cfg80211_unlock_rdev(rdev);
rtnl_unlock();
--
1.8.2
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