On Fri, 22 Mar 2024, George Stark wrote: > Hello Lee > > On 3/21/24 21:11, Lee Jones wrote: > > On Thu, 14 Mar 2024, George Stark wrote: > > > > > This patch series fixes the problem of devm_led_classdev_register misusing. > > > > > > The basic problem is described in [1]. Shortly when devm_led_classdev_register() > > > is used then led_classdev_unregister() called after driver's remove() callback. > > > led_classdev_unregister() calls driver's brightness_set callback and that callback > > > may use resources which were destroyed already in driver's remove(). > > > > > > After discussion with maintainers [2] [3] we decided: > > > 1) don't touch led subsystem core code and don't remove led_set_brightness() from it > > > but fix drivers > > > 2) don't use devm_led_classdev_unregister > > > > > > So the solution is to use devm wrappers for all resources > > > driver's brightness_set() depends on. And introduce dedicated devm wrapper > > > for mutex as it's often used resource. > > ... > > > > locking/mutex: introduce devm_mutex_init() > > > leds: aw2013: use devm API to cleanup module's resources > > > leds: aw200xx: use devm API to cleanup module's resources > > > leds: lp3952: use devm API to cleanup module's resources > > > leds: lm3532: use devm API to cleanup module's resources > > > leds: nic78bx: use devm API to cleanup module's resources > > > leds: mlxreg: use devm_mutex_init() for mutex initialization > > > leds: an30259a: use devm_mutex_init() for mutex initialization > > > > > > drivers/leds/leds-an30259a.c | 14 ++++---------- > > > drivers/leds/leds-aw200xx.c | 32 +++++++++++++++++++++----------- > > > drivers/leds/leds-aw2013.c | 25 +++++++++++++------------ > > > drivers/leds/leds-lm3532.c | 29 +++++++++++++++++------------ > > > drivers/leds/leds-lp3952.c | 21 +++++++++++---------- > > > drivers/leds/leds-mlxreg.c | 14 +++++--------- > > > drivers/leds/leds-nic78bx.c | 23 +++++++++++++---------- > > > include/linux/mutex.h | 27 +++++++++++++++++++++++++++ > > > kernel/locking/mutex-debug.c | 11 +++++++++++ > > > 9 files changed, 122 insertions(+), 74 deletions(-) > > > > Doesn't apply to v6.8. > > > > What base was used for this? > > I've just pulled git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git > and v7 was applied cleanly. linux-next is ok too. > > v6.8 is lack of recent patch 6969d0a2ba1adc9ba6a49b9805f24080896c255c > v7's patch #2 depends on it No problem. I'll wait for v6.9-rc1. -- Lee Jones [李琼斯]
