The patch regulator: da9063: Fix notifier mutex lock warning
has been applied to the regulator tree at https://git.kernel.org/pub/scm/linux/kernel/git/broonie/regulator.git All being well this means that it will be integrated into the linux-next tree (usually sometime in the next 24 hours) and sent to Linus during the next merge window (or sooner if it is a bug fix), however if problems are discovered then the patch may be dropped or reverted. You may get further e-mails resulting from automated or manual testing and review of the tree, please engage with people reporting problems and send followup patches addressing any issues that are reported if needed. If any updates are required or you are submitting further changes they should be sent as incremental updates against current git, existing patches will not be replaced. Please add any relevant lists and maintainers to the CCs when replying to this mail. Thanks, Mark >From 29d40b4a5776ec4727c9f0e00a884423dd5e3366 Mon Sep 17 00:00:00 2001 From: Steve Twiss <[email protected]> Date: Tue, 26 Feb 2019 15:23:02 +0000 Subject: [PATCH] regulator: da9063: Fix notifier mutex lock warning The mutex for the regulator_dev must be controlled by the caller of the regulator_notifier_call_chain(), as described in the comment for that function. Failure to mutex lock and unlock surrounding the notifier call results in a kernel WARN_ON_ONCE() which will dump a backtrace for the regulator_notifier_call_chain() when that function call is first made. The mutex can be controlled using the regulator_lock/unlock() API. Fixes: 69ca3e58d178 ("regulator: da9063: Add Dialog DA9063 voltage regulators support.") Suggested-by: Adam Thomson <[email protected]> Signed-off-by: Steve Twiss <[email protected]> Signed-off-by: Mark Brown <[email protected]> --- drivers/regulator/da9063-regulator.c | 5 ++++- 1 file changed, 4 insertions(+), 1 deletion(-) diff --git a/drivers/regulator/da9063-regulator.c b/drivers/regulator/da9063-regulator.c index 2b0c7a85306a..d7bdb95b7602 100644 --- a/drivers/regulator/da9063-regulator.c +++ b/drivers/regulator/da9063-regulator.c @@ -615,9 +615,12 @@ static irqreturn_t da9063_ldo_lim_event(int irq, void *data) if (regl->info->oc_event.reg != DA9063_REG_STATUS_D) continue; - if (BIT(regl->info->oc_event.lsb) & bits) + if (BIT(regl->info->oc_event.lsb) & bits) { + regulator_lock(regl->rdev); regulator_notifier_call_chain(regl->rdev, REGULATOR_EVENT_OVER_CURRENT, NULL); + regulator_unlock(regl->rdev); + } } return IRQ_HANDLED; -- 2.20.1
