From: Qiushi Wu <wu000273@umn.edu>
Date: Sat, 23 May 2020 03:16:08 +0000 (-0500)
Subject: platform/chrome: cros_ec_ishtp: Fix a double-unlock issue
X-Git-Tag: v5.7.17~99
X-Git-Url: http://git.ipfire.org/cgi-bin/gitweb.cgi?a=commitdiff_plain;h=538576a05cf8d0da16ea2bf194e997891adf82ef;p=thirdparty%2Fkernel%2Fstable.git

platform/chrome: cros_ec_ishtp: Fix a double-unlock issue

[ 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@umn.edu>
Tested-by: Mathew King <mathewk@chromium.org>
Signed-off-by: Enric Balletbo i Serra <enric.balletbo@collabora.com>
Signed-off-by: Sasha Levin <sashal@kernel.org>
---

diff --git a/drivers/platform/chrome/cros_ec_ishtp.c b/drivers/platform/chrome/cros_ec_ishtp.c
index 93a71e93a2f15..41d60af618c9d 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;