releases/4.9.62/wcn36xx-don-t-use-the-destroyed-hal_mutex.patch

From foo@baz Thu Nov  9 09:48:01 CET 2017
From: Bjorn Andersson <bjorn.andersson@linaro.org>
Date: Wed, 11 Jan 2017 16:32:21 +0200
Subject: wcn36xx: Don't use the destroyed hal_mutex

From: Bjorn Andersson <bjorn.andersson@linaro.org>


[ Upstream commit d53628882255481b710641dd0118fbd80af6e983 ]

ieee80211_unregister_hw() might invoke operations to stop the interface,
that uses the hal_mutex. So don't destroy it until after we're done
using it.

Signed-off-by: Bjorn Andersson <bjorn.andersson@linaro.org>
Signed-off-by: Kalle Valo <kvalo@qca.qualcomm.com>
Signed-off-by: Sasha Levin <alexander.levin@verizon.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
---
 drivers/net/wireless/ath/wcn36xx/main.c |    3 ++-
 1 file changed, 2 insertions(+), 1 deletion(-)

--- a/drivers/net/wireless/ath/wcn36xx/main.c
+++ b/drivers/net/wireless/ath/wcn36xx/main.c
@@ -1165,11 +1165,12 @@ static int wcn36xx_remove(struct platfor
 	wcn36xx_dbg(WCN36XX_DBG_MAC, "platform remove\n");
 
 	release_firmware(wcn->nv);
-	mutex_destroy(&wcn->hal_mutex);
 
 	ieee80211_unregister_hw(hw);
 	iounmap(wcn->dxe_base);
 	iounmap(wcn->ccu_base);
+
+	mutex_destroy(&wcn->hal_mutex);
 	ieee80211_free_hw(hw);
 
 	return 0;