Hi Mark,
This patch-set fixes a WARN_ON_ONCE() backtrace call caused by not locking the mutex from the function call regulator_notifier_call_chain(). It does this for thirteen regulator drivers by adding a mutex lock surrounding the notifier calls. This missing mutex lock has been around for a while, but the API I have used used here to fix it (i.e. regulator_lock()/regulator_unlock()) has only been in the kernel since v4.18. Therefore as this fix stands, the patches do not port back very far in kernel history. Regards, Steve Steve Twiss (13): regulator: da9055: Fix notifier mutex lock warning regulator: da9062: Fix notifier mutex lock warning regulator: da9063: Fix notifier mutex lock warning regulator: da9211: Fix notifier mutex lock warning regulator: lp8755: Fix notifier mutex lock warning regulator: ltc3589: Fix notifier mutex lock warning regulator: ltc3676: Fix notifier mutex lock warning regulator: pv88060: Fix notifier mutex lock warning regulator: pv88080: Fix notifier mutex lock warning regulator: pv88090: Fix notifier mutex lock warning regulator: wm831x: Fix notifier mutex lock warning regulator: wm831x isink: Fix notifier mutex lock warning regulator: wm831x ldo: Fix notifier mutex lock warning drivers/regulator/da9055-regulator.c | 2 ++ drivers/regulator/da9062-regulator.c | 2 ++ drivers/regulator/da9063-regulator.c | 5 ++++- drivers/regulator/da9211-regulator.c | 4 ++++ drivers/regulator/lp8755.c | 15 ++++++++++++--- drivers/regulator/ltc3589.c | 10 ++++++++-- drivers/regulator/ltc3676.c | 10 ++++++++-- drivers/regulator/pv88060-regulator.c | 4 ++++ drivers/regulator/pv88080-regulator.c | 4 ++++ drivers/regulator/pv88090-regulator.c | 4 ++++ drivers/regulator/wm831x-dcdc.c | 4 ++++ drivers/regulator/wm831x-isink.c | 2 ++ drivers/regulator/wm831x-ldo.c | 2 ++ 13 files changed, 60 insertions(+), 8 deletions(-) -- 1.9.3
