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

Message ID 20190312214605.10223-3-u.kleine-koenig@pengutronix.de
State New
Headers show
Series
  • pwm: ensure pwm_apply_state() doesn't modify the state argument
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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(-)

Patch
diff mbox series

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;
 }