linux-kernel - [PATCH 5.5 08/46] staging: wfx: fix warning about freeing in-use mutex during device unregister

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Message-Id: <20200407101500.370794039@linuxfoundation.org>
Date:   Tue,  7 Apr 2020 12:21:39 +0200
From:   Greg Kroah-Hartman <gregkh@...uxfoundation.org>
To:     linux-kernel@...r.kernel.org
Cc:     Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
        stable@...r.kernel.org,
        Jérôme Pouiller 
        <jerome.pouiller@...abs.com>, Sasha Levin <sashal@...nel.org>
Subject: [PATCH 5.5 08/46] staging: wfx: fix warning about freeing in-use mutex during device unregister

From: Jérôme Pouiller <jerome.pouiller@...abs.com>

[ Upstream commit bab0a0b03442a62fe3abefcb2169e0b9ff95990c ]

After hif_shutdown(), communication with the chip is no more possible.
It the only request that never reply. Therefore, hif_cmd.lock is never
unlocked. hif_shutdown() unlock itself hif_cmd.lock to avoid a potential
warning during disposal of device. hif_cmd.key_renew_lock should also
been unlocked for the same reason.

Signed-off-by: Jérôme Pouiller <jerome.pouiller@...abs.com>
Link: https://lore.kernel.org/r/20200310101356.182818-2-Jerome.Pouiller@silabs.com
Signed-off-by: Greg Kroah-Hartman <gregkh@...uxfoundation.org>
Signed-off-by: Sasha Levin <sashal@...nel.org>
---
 drivers/staging/wfx/hif_tx.c | 1 +
 1 file changed, 1 insertion(+)

diff --git a/drivers/staging/wfx/hif_tx.c b/drivers/staging/wfx/hif_tx.c
index cb7cddcb98159..16e7d190430f3 100644
--- a/drivers/staging/wfx/hif_tx.c
+++ b/drivers/staging/wfx/hif_tx.c
@@ -141,6 +141,7 @@ int hif_shutdown(struct wfx_dev *wdev)
 	else
 		control_reg_write(wdev, 0);
 	mutex_unlock(&wdev->hif_cmd.lock);
+	mutex_unlock(&wdev->hif_cmd.key_renew_lock);
 	kfree(hif);
 	return ret;
 }
-- 
2.20.1