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pwm: mediatek: Ensure to disable clocks in error path

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commit 505b730ede7f5c4083ff212aa955155b5b92e574 upstream.

After enabling the clocks each error path must disable the clocks again.
One of them failed to do so. Unify the error paths to use goto to make it
harder for future changes to add a similar bug.

Fixes: 7ca59947b5fc ("pwm: mediatek: Prevent divide-by-zero in pwm_mediatek_config()")
Signed-off-by: Uwe Kleine-König <u.kleine-koenig@baylibre.com>
Link: https://lore.kernel.org/r/20250704172728.626815-2-u.kleine-koenig@baylibre.com
Cc: stable@vger.kernel.org
[ukleinek: backported to 5.15.y]
Signed-off-by: Uwe Kleine-König <ukleinek@kernel.org>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
This commit is contained in:
Uwe Kleine-König 2025-07-04 19:27:27 +02:00 • committed by Greg Kroah-Hartman
commit 2a668b1707
1 changed files with 9 additions and 6 deletions
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15
drivers/pwm/pwm-mediatek.c
View file

@ -134,8 +134,10 @@ static int pwm_mediatek_config(struct pwm_chip *chip, struct pwm_device *pwm,
return ret;
clk_rate = clk_get_rate(pc->clk_pwms[pwm->hwpwm]);
if (!clk_rate)
return -EINVAL;
if (!clk_rate) {
ret = -EINVAL;
goto out;
}
/* Make sure we use the bus clock and not the 26MHz clock */
if (pc->soc->has_ck_26m_sel)
@ -154,9 +156,9 @@ static int pwm_mediatek_config(struct pwm_chip *chip, struct pwm_device *pwm,
}
if (clkdiv > PWM_CLK_DIV_MAX) {
pwm_mediatek_clk_disable(chip, pwm);
dev_err(chip->dev, "period %d not supported\n", period_ns);
return -EINVAL;
dev_err(chip->dev, "period of %d ns not supported\n", period_ns);
ret = -EINVAL;
goto out;
}
if (pc->soc->pwm45_fixup && pwm->hwpwm > 2) {
@ -173,9 +175,10 @@ static int pwm_mediatek_config(struct pwm_chip *chip, struct pwm_device *pwm,
pwm_mediatek_writel(pc, pwm->hwpwm, reg_width, cnt_period);
pwm_mediatek_writel(pc, pwm->hwpwm, reg_thres, cnt_duty);
out:
pwm_mediatek_clk_disable(chip, pwm);
return 0;
return ret;
}
static int pwm_mediatek_enable(struct pwm_chip *chip, struct pwm_device *pwm)