From: wu000273@umn.edu
To: a.zummo@towertech.it
Cc: alexandre.belloni@bootlin.com, Markus.Elfring@web.de,
linux-rtc@vger.kernel.org, linux-kernel@vger.kernel.org,
kjlu@umn.edu, wu000273@umn.edu
Subject: [PATCH v2] rtc: mc13xxx: fix a double-unlock issue
Date: Sun, 3 May 2020 13:22:35 -0500 [thread overview]
Message-ID: <20200503182235.1652-1-wu000273@umn.edu> (raw)
From: Qiushi Wu <wu000273@umn.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@umn.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
next reply other threads:[~2020-05-03 18:22 UTC|newest]
Thread overview: 2+ messages / expand[flat|nested] mbox.gz Atom feed top
2020-05-03 18:22 wu000273 [this message]
2020-05-11 14:23 ` [PATCH v2] rtc: mc13xxx: fix a double-unlock issue Alexandre Belloni
Reply instructions:
You may reply publicly to this message via plain-text email
using any one of the following methods:
* Save the following mbox file, import it into your mail client,
and reply-to-all from there: mbox
Avoid top-posting and favor interleaved quoting:
https://en.wikipedia.org/wiki/Posting_style#Interleaved_style
* Reply using the --to, --cc, and --in-reply-to
switches of git-send-email(1):
git send-email \
--in-reply-to=20200503182235.1652-1-wu000273@umn.edu \
--to=wu000273@umn.edu \
--cc=Markus.Elfring@web.de \
--cc=a.zummo@towertech.it \
--cc=alexandre.belloni@bootlin.com \
--cc=kjlu@umn.edu \
--cc=linux-kernel@vger.kernel.org \
--cc=linux-rtc@vger.kernel.org \
/path/to/YOUR_REPLY
https://kernel.org/pub/software/scm/git/docs/git-send-email.html
* If your mail client supports setting the In-Reply-To header
via mailto: links, try the mailto: link
Be sure your reply has a Subject: header at the top and a blank line
before the message body.
This is a public inbox, see mirroring instructions
for how to clone and mirror all data and code used for this inbox;
as well as URLs for NNTP newsgroup(s).