linux-kernel - [PATCH 2/2] rtc: st-lpc: Simplify clk handling in st_rtc

lists.openwall.net		lists / announce owl-users owl-dev john-users john-dev passwdqc-users yescrypt popa3d-users / oss-security kernel-hardening musl sabotage tlsify passwords / crypt-dev xvendor / Bugtraq Full-Disclosure linux-kernel linux-netdev linux-ext4 linux-hardening linux-cve-announce PHC
Open Source and information security mailing list archives

Hash Suite: Windows password security audit tool. GUI, reports in PDF.

[<prev] [next>] [<thread-prev] [thread-next>] [day] [month] [year] [list]

Message-Id: <992dd8c31be0bb5b8a9d8b5e8e94807ab0848a66.1686251455.git.christophe.jaillet@wanadoo.fr>
Date:   Thu,  8 Jun 2023 21:12:00 +0200
From:   Christophe JAILLET <christophe.jaillet@...adoo.fr>
To:     Patrice Chotard <patrice.chotard@...s.st.com>,
        Alessandro Zummo <a.zummo@...ertech.it>,
        Alexandre Belloni <alexandre.belloni@...tlin.com>
Cc:     linux-kernel@...r.kernel.org, kernel-janitors@...r.kernel.org,
        Christophe JAILLET <christophe.jaillet@...adoo.fr>,
        linux-arm-kernel@...ts.infradead.org, linux-rtc@...r.kernel.org
Subject: [PATCH 2/2] rtc: st-lpc: Simplify clk handling in st_rtc_probe()

Use devm_clk_get_enabled() instead of hand writing it. This simplifies
error handling and removes some lines of code.

Also use dev_err_probe() which filters -EPROBE_DEFER.

Signed-off-by: Christophe JAILLET <christophe.jaillet@...adoo.fr>
---
 drivers/rtc/rtc-st-lpc.c | 16 +++++-----------
 1 file changed, 5 insertions(+), 11 deletions(-)

diff --git a/drivers/rtc/rtc-st-lpc.c b/drivers/rtc/rtc-st-lpc.c
index d04d46f9cc65..d492a2d26600 100644
--- a/drivers/rtc/rtc-st-lpc.c
+++ b/drivers/rtc/rtc-st-lpc.c
@@ -228,17 +228,13 @@ static int st_rtc_probe(struct platform_device *pdev)
 	enable_irq_wake(rtc->irq);
 	disable_irq(rtc->irq);
 
-	rtc->clk = devm_clk_get(&pdev->dev, NULL);
-	if (IS_ERR(rtc->clk)) {
-		dev_err(&pdev->dev, "Unable to request clock\n");
-		return PTR_ERR(rtc->clk);
-	}
-
-	clk_prepare_enable(rtc->clk);
+	rtc->clk = devm_clk_get_enabled(&pdev->dev, NULL);
+	if (IS_ERR(rtc->clk))
+		return dev_err_probe(&pdev->dev, PTR_ERR(rtc->clk),
+				     "Unable to request clock\n");
 
 	rtc->clkrate = clk_get_rate(rtc->clk);
 	if (!rtc->clkrate) {
-		clk_disable_unprepare(rtc->clk);
 		dev_err(&pdev->dev, "Unable to fetch clock rate\n");
 		return -EINVAL;
 	}
@@ -252,10 +248,8 @@ static int st_rtc_probe(struct platform_device *pdev)
 	do_div(rtc->rtc_dev->range_max, rtc->clkrate);
 
 	ret = devm_rtc_register_device(rtc->rtc_dev);
-	if (ret) {
-		clk_disable_unprepare(rtc->clk);
+	if (ret)
 		return ret;
-	}
 
 	return 0;
 }
-- 
2.34.1