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Memory holding a struct device must not be freed before the reference count drops to zero. So a struct pwm_chip must not live in memory freed by a driver on unbind. All in-tree drivers were fixed accordingly, but as out-of-tree drivers, that were not adapted, still compile fine, catch these in pwmchip_add(). Link: https://lore.kernel.org/r/35f5b229c98f78b2f6ce2397259a4a936be477c0.1707900770.git.u.kleine-koenig@pengutronix.de Signed-off-by: Uwe Kleine-König <u.kleine-koenig@pengutronix.de>