diff options
| author | Uwe Kleine-König <u.kleine-koenig@pengutronix.de> | 2024-03-17 11:40:35 +0100 |
|---|---|---|
| committer | Uwe Kleine-König <u.kleine-koenig@pengutronix.de> | 2024-04-26 21:29:17 +0200 |
| commit | ee37bf50749f06b29394d7ba8a85b47f023b61e2 (patch) | |
| tree | 061cf6f9a5e533c464ff1aa26373487494e1126c /include/linux/pwm.h | |
| parent | e9cc807f87ffd1ccc919731e8f624982935af3e0 (diff) | |
pwm: Ensure a struct pwm has the same lifetime as its pwm_chip
It's required to not free the memory underlying a requested PWM
while a consumer still has a reference to it. While currently a pwm_chip
doesn't live long enough in all cases, linking the struct pwm to the
pwm_chip results in the right lifetime as soon as the pwmchip is living
long enough. This happens with the following commits.
Note this is a breaking change for all pwm drivers that don't use
pwmchip_alloc().
Reviewed-by: Gustavo A. R. Silva <gustavoars@kernel.org> # for struct_size() and __counted_by()
Link: https://lore.kernel.org/r/7e9e958841f049026c0023b309cc9deecf0ab61d.1710670958.git.u.kleine-koenig@pengutronix.de
Signed-off-by: Uwe Kleine-König <u.kleine-koenig@pengutronix.de>
Diffstat (limited to 'include/linux/pwm.h')
| -rw-r--r-- | include/linux/pwm.h | 2 |
1 files changed, 1 insertions, 1 deletions
diff --git a/include/linux/pwm.h b/include/linux/pwm.h index 17e45d8413ed..78b9061572ff 100644 --- a/include/linux/pwm.h +++ b/include/linux/pwm.h @@ -290,7 +290,7 @@ struct pwm_chip { /* only used internally by the PWM framework */ bool uses_pwmchip_alloc; void *driver_data; - struct pwm_device *pwms; + struct pwm_device pwms[] __counted_by(npwm); }; static inline struct device *pwmchip_parent(const struct pwm_chip *chip) |