linux-kernel - [PATCH] platform/chrome: fix a double-unlock issue

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Message-Id: <20200523031608.17918-1-wu000273@umn.edu>
Date:   Fri, 22 May 2020 22:16:08 -0500
From:   wu000273@....edu
To:     bleung@...omium.org
Cc:     enric.balletbo@...labora.com, groeck@...omium.org,
        linux-kernel@...r.kernel.org, kjlu@....edu, wu000273@....edu
Subject: [PATCH] platform/chrome: fix a double-unlock issue

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

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>
---
 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 93a71e93a2f1..41d60af618c9 100644
--- a/drivers/platform/chrome/cros_ec_ishtp.c
+++ b/drivers/platform/chrome/cros_ec_ishtp.c
@@ -660,8 +660,10 @@ 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;
 
-- 
2.17.1