cfg80211: Fix mutex locking in reg_last_request_cell_base

should fix the following issue

	[ 3229.815012] [ BUG: lock held when returning to user space! ]
	[ 3229.815016] 3.5.0-rc7-wl #28 Tainted: G        W  O
	[ 3229.815017]
	------------------------------------------------
	[ 3229.815019] wpa_supplicant/5783 is leaving the kernel with locks still held!
	[ 3229.815022] 1 lock held by wpa_supplicant/5783:
	[ 3229.815023]  #0: (reg_mutex){+.+.+.}, at: [<fa65834d>]
	reg_last_request_cell_base+0x1d/0x60 [cfg80211]

Cc: Luis Rodriguez <mcgrof@gmail.com>
Signed-off-by: Mohammed Shafi Shajakhan <mohammed@qca.qualcomm.com>
Tested-by: Luciano Coelho <coelho@ti.com>
Signed-off-by: Johannes Berg <johannes.berg@intel.com>

1 files changed, 3 insertions, 1 deletions

diff --git a/net/wireless/reg.c b/net/wireless/reg.c
index dbb01df3aacb..2303ee73b50a 100644
--- a/net/wireless/reg.c
+++ b/net/wireless/reg.c
@@ -929,11 +929,13 @@ static bool reg_request_cell_base(struct regulatory_request *request)
 
 bool reg_last_request_cell_base(void)
 {
+        bool val;
         assert_cfg80211_lock();
 
         mutex_lock(&reg_mutex);
-        return reg_request_cell_base(last_request);
+        val = reg_request_cell_base(last_request);
         mutex_unlock(&reg_mutex);
+        return val;
 }
 
 #ifdef CONFIG_CFG80211_CERTIFICATION_ONUS