pwm: Ensure a struct pwm has the same lifetime as its pwm_chip

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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>

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This commit is contained in:

Uwe Kleine-König 2024-03-17 11:40:35 +01:00

parent e9cc807f87

commit ee37bf5074

2 changed files with 11 additions and 18 deletions

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27

drivers/pwm/core.c

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2

include/linux/pwm.h

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