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Date: Fri, 22 Mar 2019 12:14:03 +0100 From: Greg Kroah-Hartman <gregkh@...uxfoundation.org> To: linux-kernel@...r.kernel.org Cc: Greg Kroah-Hartman <gregkh@...uxfoundation.org>, stable@...r.kernel.org, Jonathan Bakker <xc-racer2@...e.ca>, Paweł Chmiel <pawel.mikolaj.chmiel@...il.com>, Dmitry Torokhov <dmitry.torokhov@...il.com>, Sasha Levin <sashal@...nel.org> Subject: [PATCH 4.14 015/183] Input: pwm-vibra - prevent unbalanced regulator 4.14-stable review patch. If anyone has any objections, please let me know. ------------------ [ Upstream commit 3ca232df9921f083c3b37ba5fbc76f4d9046268b ] pwm_vibrator_stop disables the regulator, but it can be called from multiple places, even when the regulator is already disabled. Fix this by using regulator_is_enabled check when starting and stopping device. Signed-off-by: Jonathan Bakker <xc-racer2@...e.ca> Signed-off-by: Paweł Chmiel <pawel.mikolaj.chmiel@...il.com> Signed-off-by: Dmitry Torokhov <dmitry.torokhov@...il.com> Signed-off-by: Sasha Levin <sashal@...nel.org> --- drivers/input/misc/pwm-vibra.c | 17 ++++++++++++----- 1 file changed, 12 insertions(+), 5 deletions(-) diff --git a/drivers/input/misc/pwm-vibra.c b/drivers/input/misc/pwm-vibra.c index 55da191ae550..9df87431d7d4 100644 --- a/drivers/input/misc/pwm-vibra.c +++ b/drivers/input/misc/pwm-vibra.c @@ -34,6 +34,7 @@ struct pwm_vibrator { struct work_struct play_work; u16 level; u32 direction_duty_cycle; + bool vcc_on; }; static int pwm_vibrator_start(struct pwm_vibrator *vibrator) @@ -42,10 +43,13 @@ static int pwm_vibrator_start(struct pwm_vibrator *vibrator) struct pwm_state state; int err; - err = regulator_enable(vibrator->vcc); - if (err) { - dev_err(pdev, "failed to enable regulator: %d", err); - return err; + if (!vibrator->vcc_on) { + err = regulator_enable(vibrator->vcc); + if (err) { + dev_err(pdev, "failed to enable regulator: %d", err); + return err; + } + vibrator->vcc_on = true; } pwm_get_state(vibrator->pwm, &state); @@ -76,7 +80,10 @@ static int pwm_vibrator_start(struct pwm_vibrator *vibrator) static void pwm_vibrator_stop(struct pwm_vibrator *vibrator) { - regulator_disable(vibrator->vcc); + if (vibrator->vcc_on) { + regulator_disable(vibrator->vcc); + vibrator->vcc_on = false; + } if (vibrator->pwm_dir) pwm_disable(vibrator->pwm_dir); -- 2.19.1
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