linux-kernel - [PATCH 5.8 119/232] platform/chrome: cros_ec

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Date:   Thu, 20 Aug 2020 11:19:30 +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, Qiushi Wu <wu000273@....edu>,
        Mathew King <mathewk@...omium.org>,
        Enric Balletbo i Serra <enric.balletbo@...labora.com>,
        Sasha Levin <sashal@...nel.org>
Subject: [PATCH 5.8 119/232] platform/chrome: cros_ec_ishtp: Fix a double-unlock issue

From: Qiushi Wu <wu000273@....edu>

[ Upstream commit aaa3cbbac326c95308e315f1ab964a3369c4d07d ]

In function cros_ec_ishtp_probe(), "up_write" is already called
before function "cros_ec_dev_init". But "up_write" will be called
again after the calling of the function "cros_ec_dev_init" failed.
Thus add a call of the function “down_write” in this if branch
for the completion of the exception handling.

Fixes: 26a14267aff2 ("platform/chrome: Add ChromeOS EC ISHTP driver")
Signed-off-by: Qiushi Wu <wu000273@....edu>
Tested-by: Mathew King <mathewk@...omium.org>
Signed-off-by: Enric Balletbo i Serra <enric.balletbo@...labora.com>
Signed-off-by: Sasha Levin <sashal@...nel.org>
---
 drivers/platform/chrome/cros_ec_ishtp.c | 4 +++-
 1 file changed, 3 insertions(+), 1 deletion(-)

diff --git a/drivers/platform/chrome/cros_ec_ishtp.c b/drivers/platform/chrome/cros_ec_ishtp.c
index ed794a7ddba9b..81364029af367 100644
--- a/drivers/platform/chrome/cros_ec_ishtp.c
+++ b/drivers/platform/chrome/cros_ec_ishtp.c
@@ -681,8 +681,10 @@ static int cros_ec_ishtp_probe(struct ishtp_cl_device *cl_device)
 
 	/* Register croc_ec_dev mfd */
 	rv = cros_ec_dev_init(client_data);
-	if (rv)
+	if (rv) {
+		down_write(&init_lock);
 		goto end_cros_ec_dev_init_error;
+	}
 
 	return 0;
 
-- 
2.25.1