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author | Uwe Kleine-König <u.kleine-koenig@pengutronix.de> | 2019-08-24 17:37:07 +0200 |
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committer | Thierry Reding <thierry.reding@gmail.com> | 2019-09-21 03:25:10 +0200 |
commit | 71523d1812aca61e32e742e87ec064e3d8c615e1 (patch) | |
tree | 20491f0323c9b71d0628741824c4dcf992e22363 /drivers/pwm/pwm-imx27.c | |
parent | c9675829ba4b0e95c613f6d6d83d2b5cb9c5371c (diff) | |
download | linux-71523d1812aca61e32e742e87ec064e3d8c615e1.tar.bz2 |
pwm: Ensure pwm_apply_state() doesn't modify the state argument
It is surprising for a PWM consumer when the variable holding the
requested state is modified by pwm_apply_state(). Consider for example a
driver doing:
#define PERIOD 5000000
#define DUTY_LITTLE 10
...
struct pwm_state state = {
.period = PERIOD,
.duty_cycle = DUTY_LITTLE,
.polarity = PWM_POLARITY_NORMAL,
.enabled = true,
};
pwm_apply_state(mypwm, &state);
...
state.duty_cycle = PERIOD / 2;
pwm_apply_state(mypwm, &state);
For sure the second call to pwm_apply_state() should still have
state.period = PERIOD and not something the hardware driver chose for a
reason that doesn't necessarily apply to the second call.
So declare the state argument as a pointer to a const type and adapt all
drivers' .apply callbacks.
Signed-off-by: Uwe Kleine-König <u.kleine-koenig@pengutronix.de>
Signed-off-by: Thierry Reding <thierry.reding@gmail.com>
Diffstat (limited to 'drivers/pwm/pwm-imx27.c')
-rw-r--r-- | drivers/pwm/pwm-imx27.c | 2 |
1 files changed, 1 insertions, 1 deletions
diff --git a/drivers/pwm/pwm-imx27.c b/drivers/pwm/pwm-imx27.c index 91c23cbbc167..ae11d8577f18 100644 --- a/drivers/pwm/pwm-imx27.c +++ b/drivers/pwm/pwm-imx27.c @@ -209,7 +209,7 @@ static void pwm_imx27_wait_fifo_slot(struct pwm_chip *chip, } static int pwm_imx27_apply(struct pwm_chip *chip, struct pwm_device *pwm, - struct pwm_state *state) + const struct pwm_state *state) { unsigned long period_cycles, duty_cycles, prescale; struct pwm_imx27_chip *imx = to_pwm_imx27_chip(chip); |