pwm: renesas-tpu: Fix runtime PM reference leak

tpu_pwm_timer_start() used pm_runtime_get_sync() without checking its
return value before touching the TPU clock.  A failed runtime resume was
therefore ignored, and the callback continued into register access.

Use pm_runtime_resume_and_get() and propagate a failed resume.  Keep the
matching put when clock preparation fails after a successful resume.

tpu_pwm_disable() also needs to propagate a failed start so that the PWM
apply callback does not access registers while runtime PM is inactive.

This issue was found by a static analysis checker and confirmed by manual
source review.

Fixes: 99b82abb0a35 ("pwm: Add Renesas TPU PWM driver")
Signed-off-by: Ruoyu Wang <ruoyuw560@gmail.com>
Link: https://patch.msgid.link/20260814134143.1388120-1-ruoyuw560@gmail.com
Signed-off-by: Uwe Kleine-König <ukleinek@kernel.org>

0 files changed, 0 insertions, 0 deletions