linux-kernel - [PATCH 4.9 45/87] wcn36xx: Dont use the destroyed hal

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Message-Id: <20171113125619.506952022@linuxfoundation.org>
Date:   Mon, 13 Nov 2017 13:56:02 +0100
From:   Greg Kroah-Hartman <gregkh@...uxfoundation.org>
To:     linux-kernel@...r.kernel.org
Cc:     Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
        stable@...r.kernel.org,
        Bjorn Andersson <bjorn.andersson@...aro.org>,
        Kalle Valo <kvalo@....qualcomm.com>,
        Sasha Levin <alexander.levin@...izon.com>
Subject: [PATCH 4.9 45/87] wcn36xx: Dont use the destroyed hal_mutex

4.9-stable review patch.  If anyone has any objections, please let me know.

------------------

From: Bjorn Andersson <bjorn.andersson@...aro.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@...aro.org>
Signed-off-by: Kalle Valo <kvalo@....qualcomm.com>
Signed-off-by: Sasha Levin <alexander.levin@...izon.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@...uxfoundation.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;