diff mbox series

[v2,2/3] pwm: sun4i: Don't update the state for the caller of pwm_apply_state()

Message ID 20190312214605.10223-3-u.kleine-koenig@pengutronix.de (mailing list archive)
State New, archived
Headers show
Series pwm: ensure pwm_apply_state() doesn't modify the state argument | expand

Commit Message

Uwe Kleine-König March 12, 2019, 9:46 p.m. UTC 
The pwm-sun4i driver is one of only two PWM drivers which updates the
state for the caller of pwm_apply_state(). This might have surprising
results if the caller reuses the values expecting them to still
represent the same state. Also note that this feedback was incomplete as
the matching struct pwm_device::state wasn't updated and so
pwm_get_state still returned the originally requested state.

Signed-off-by: Uwe Kleine-König <u.kleine-koenig@pengutronix.de>
---
 drivers/pwm/pwm-sun4i.c | 6 ------
 1 file changed, 6 deletions(-)
diff mbox series

Patch

diff --git a/drivers/pwm/pwm-sun4i.c b/drivers/pwm/pwm-sun4i.c
index 470d4f71e7eb..142a603fe7ea 100644
--- a/drivers/pwm/pwm-sun4i.c
+++ b/drivers/pwm/pwm-sun4i.c
@@ -193,12 +193,6 @@  static int sun4i_pwm_calculate(struct sun4i_pwm_chip *sun4i_pwm,
 	*dty = div;
 	*prsclr = prescaler;
 
-	div = (u64)pval * NSEC_PER_SEC * *prd;
-	state->period = DIV_ROUND_CLOSEST_ULL(div, clk_rate);
-
-	div = (u64)pval * NSEC_PER_SEC * *dty;
-	state->duty_cycle = DIV_ROUND_CLOSEST_ULL(div, clk_rate);
-
 	return 0;
 }