From: Simon South <simon@simonsouth.net>
To: tpiepho@gmail.com, thierry.reding@gmail.com,
u.kleine-koenig@pengutronix.de, robin.murphy@arm.com,
lee.jones@linaro.org, heiko@sntech.de, bbrezillon@kernel.org,
linux-pwm@vger.kernel.org, linux-arm-kernel@lists.infradead.org,
linux-rockchip@lists.infradead.org
Cc: simon@simonsouth.net
Subject: [PATCH v3 2/7] pwm: rockchip: rockchip_pwm_probe(): Remove superfluous clk_unprepare()
Date: Wed, 23 Dec 2020 11:01:04 -0500 [thread overview]
Message-ID: <fe86b3ad145c5df3b16b09a83769f078bb4a9d1f.1608735481.git.simon@simonsouth.net> (raw)
In-Reply-To: <cover.1608735481.git.simon@simonsouth.net>
If rockchip_pwm_probe() fails to register a PWM device it calls
clk_unprepare() for the device's PWM clock, without having first disabled
the clock and before jumping to an error handler that also unprepares
it. This is likely to produce warnings from the kernel about the clock
being unprepared when it is still enabled, and then being unprepared when
it has already been unprepared.
Prevent these warnings by removing this unnecessary call to
clk_unprepare().
Fixes: 48cf973cae33 ("pwm: rockchip: Avoid glitches on already running PWMs")
Signed-off-by: Simon South <simon@simonsouth.net>
---
drivers/pwm/pwm-rockchip.c | 1 -
1 file changed, 1 deletion(-)
diff --git a/drivers/pwm/pwm-rockchip.c b/drivers/pwm/pwm-rockchip.c
index d2058138ce1e..0c940c7508ea 100644
--- a/drivers/pwm/pwm-rockchip.c
+++ b/drivers/pwm/pwm-rockchip.c
@@ -353,7 +353,6 @@ static int rockchip_pwm_probe(struct platform_device *pdev)
ret = pwmchip_add(&pc->chip);
if (ret < 0) {
- clk_unprepare(pc->clk);
dev_err(&pdev->dev, "pwmchip_add() failed: %d\n", ret);
goto err_pclk;
}
--
2.29.2
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next prev parent reply other threads:[~2020-12-23 16:03 UTC|newest]
Thread overview: 16+ messages / expand[flat|nested] mbox.gz Atom feed top
2020-12-23 16:01 [PATCH v3 0/7] pwm: rockchip: Eliminate potential race condition when probing Simon South
2020-12-23 16:01 ` [PATCH v3 1/7] pwm: rockchip: Enable APB clock during register access while probing Simon South
2021-01-13 7:23 ` Uwe Kleine-König
2020-12-23 16:01 ` Simon South [this message]
2021-01-13 7:31 ` [PATCH v3 2/7] pwm: rockchip: rockchip_pwm_probe(): Remove superfluous clk_unprepare() Uwe Kleine-König
2020-12-23 16:01 ` [PATCH v3 3/7] pwm: rockchip: Replace "bus clk" with "PWM clk" Simon South
2021-01-13 7:33 ` Uwe Kleine-König
2020-12-23 16:01 ` [PATCH v3 4/7] pwm: rockchip: Eliminate potential race condition when probing Simon South
2021-01-13 7:37 ` Uwe Kleine-König
2020-12-23 16:01 ` [PATCH v3 5/7] pwm: rockchip: rockchip_pwm_probe(): Remove unneeded goto target Simon South
2021-01-13 7:38 ` Uwe Kleine-König
2020-12-23 16:01 ` [PATCH v3 6/7] pwm: rockchip: Enable PWM clock of probed device only if running Simon South
2021-01-13 7:50 ` Uwe Kleine-König
2021-01-14 15:22 ` Simon South
2020-12-23 16:01 ` [PATCH v3 7/7] pwm: rockchip: Enable clock before calling clk_get_rate() Simon South
2021-01-13 7:54 ` Uwe Kleine-König
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