From: cgel.zte@gmail.com
To: thierry.reding@gmail.com
Cc: u.kleine-koenig@pengutronix.de, lee.jones@linaro.org,
nicolas.ferre@microchip.com, alexandre.belloni@bootlin.com,
ludovic.desroches@microchip.com, linux-pwm@vger.kernel.org,
linux-arm-kernel@lists.infradead.org,
linux-kernel@vger.kernel.org,
Changcheng Deng <deng.changcheng@zte.com.cn>,
Zeal Robot <zealci@zte.com.cn>
Subject: [PATCH] pwm: Use div64_ul instead of do_div
Date: Wed, 17 Nov 2021 02:04:26 +0000 [thread overview]
Message-ID: <20211117020426.159242-1-deng.changcheng@zte.com.cn> (raw)
From: Changcheng Deng <deng.changcheng@zte.com.cn>
do_div() does a 64-by-32 division. If the divisor is unsigned long, using
div64_ul can avoid truncation to 32-bit.
Reported-by: Zeal Robot <zealci@zte.com.cn>
Signed-off-by: Changcheng Deng <deng.changcheng@zte.com.cn>
---
drivers/pwm/pwm-atmel-hlcdc.c | 4 ++--
1 file changed, 2 insertions(+), 2 deletions(-)
diff --git a/drivers/pwm/pwm-atmel-hlcdc.c b/drivers/pwm/pwm-atmel-hlcdc.c
index a43b2babc809..1ae3d73b9832 100644
--- a/drivers/pwm/pwm-atmel-hlcdc.c
+++ b/drivers/pwm/pwm-atmel-hlcdc.c
@@ -60,7 +60,7 @@ static int atmel_hlcdc_pwm_apply(struct pwm_chip *c, struct pwm_device *pwm,
return -EINVAL;
clk_period_ns = (u64)NSEC_PER_SEC * 256;
- do_div(clk_period_ns, clk_freq);
+ div64_ul(clk_period_ns, clk_freq);
}
/* Errata: cannot use slow clk on some IP revisions */
@@ -72,7 +72,7 @@ static int atmel_hlcdc_pwm_apply(struct pwm_chip *c, struct pwm_device *pwm,
return -EINVAL;
clk_period_ns = (u64)NSEC_PER_SEC * 256;
- do_div(clk_period_ns, clk_freq);
+ div64_ul(clk_period_ns, clk_freq);
}
for (pres = 0; pres <= ATMEL_HLCDC_PWMPS_MAX; pres++) {
--
2.25.1
next reply other threads:[~2021-11-17 2:04 UTC|newest]
Thread overview: 8+ messages / expand[flat|nested] mbox.gz Atom feed top
2021-11-17 2:04 cgel.zte [this message]
2021-11-17 11:24 ` [PATCH] pwm: Use div64_ul instead of do_div Uwe Kleine-König
2021-11-17 12:46 ` [PATCH V2] " cgel.zte
2021-11-17 14:54 ` Uwe Kleine-König
2021-11-18 2:52 ` [PATCH V3] " cgel.zte
2021-11-18 9:54 ` Uwe Kleine-König
2021-11-18 10:09 ` [PATCH] " Russell King (Oracle)
2021-11-18 13:19 ` Nicolas Ferre
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