linux-kernel - [PATCH v2] rtc: mc13xxx: fix a double-unlock issue

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Message-Id: <20200503182235.1652-1-wu000273@umn.edu>
Date:   Sun,  3 May 2020 13:22:35 -0500
From:   wu000273@....edu
To:     a.zummo@...ertech.it
Cc:     alexandre.belloni@...tlin.com, Markus.Elfring@....de,
        linux-rtc@...r.kernel.org, linux-kernel@...r.kernel.org,
        kjlu@....edu, wu000273@....edu
Subject: [PATCH v2] rtc: mc13xxx: fix a double-unlock issue

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

In function mc13xxx_rtc_probe, the mc13xxx_unlock() is called
before rtc_register_device(). But in the error path of
rtc_register_device(), the mc13xxx_unlock() is called again,
which causes a double-unlock problem. Thus add a call of the
function “mc13xxx_lock” in an if branch for the completion
of the exception handling.

Fixes: e4ae7023e182a ("rtc: mc13xxx: set range")
Signed-off-by: Qiushi Wu <wu000273@....edu>
---
 drivers/rtc/rtc-mc13xxx.c | 4 +++-
 1 file changed, 3 insertions(+), 1 deletion(-)

diff --git a/drivers/rtc/rtc-mc13xxx.c b/drivers/rtc/rtc-mc13xxx.c
index afce2c0b4bd6..d6802e6191cb 100644
--- a/drivers/rtc/rtc-mc13xxx.c
+++ b/drivers/rtc/rtc-mc13xxx.c
@@ -308,8 +308,10 @@ static int __init mc13xxx_rtc_probe(struct platform_device *pdev)
 	mc13xxx_unlock(mc13xxx);
 
 	ret = rtc_register_device(priv->rtc);
-	if (ret)
+	if (ret) {
+		mc13xxx_lock(mc13xxx);
 		goto err_irq_request;
+	}
 
 	return 0;
 
-- 
2.17.1