Merge series "regulator: unexport regulator_lock/unlock()" from Michał Mirosław <mirq-linux@rere.qmqm.pl>:

This removes regulator_lock/unlock() calls around
regulator_notifier_call_chain() as they are redundant - drivers
already have to guarantee regulator_dev's existence during the call.

This should make reasoing about the lock easier, as this was the only
use outside regulator core code.

The only client that needed recursive locking from the notifier chain
was drivers/usb/host/ohci-da8xx.c, which responds to over-current
notification by calling regulator_disable().

Michał Mirosław (3):
  regulator: don't require mutex for regulator_notifier_call_chain()
  regulator: remove locking around regulator_notifier_call_chain()
  regulator: unexport regulator_lock/unlock()

 drivers/regulator/core.c               | 11 +++--------
 drivers/regulator/da9055-regulator.c   |  2 --
 drivers/regulator/da9062-regulator.c   |  2 --
 drivers/regulator/da9063-regulator.c   |  2 --
 drivers/regulator/da9210-regulator.c   |  4 ----
 drivers/regulator/da9211-regulator.c   |  4 ----
 drivers/regulator/lp8755.c             |  6 ------
 drivers/regulator/ltc3589.c            | 10 ++--------
 drivers/regulator/ltc3676.c            | 10 ++--------
 drivers/regulator/pv88060-regulator.c  | 10 ++--------
 drivers/regulator/pv88080-regulator.c  | 10 ++--------
 drivers/regulator/pv88090-regulator.c  | 10 ++--------
 drivers/regulator/slg51000-regulator.c |  4 ----
 drivers/regulator/stpmic1_regulator.c  |  4 ----
 drivers/regulator/wm831x-dcdc.c        |  4 ----
 drivers/regulator/wm831x-isink.c       |  2 --
 drivers/regulator/wm831x-ldo.c         |  2 --
 drivers/regulator/wm8350-regulator.c   |  2 --
 include/linux/regulator/driver.h       |  3 ---
 19 files changed, 13 insertions(+), 89 deletions(-)

--
2.20.1

18 files changed, 11 insertions, 82 deletions

diff --git a/drivers/regulator/core.c b/drivers/regulator/core.c
index 07edbd8ebb98..2ed035114ee8 100644
--- a/drivers/regulator/core.c
+++ b/drivers/regulator/core.c
@@ -4725,14 +4725,11 @@ EXPORT_SYMBOL_GPL(regulator_bulk_free);
  * @data: callback-specific data.
  *
  * Called by regulator drivers to notify clients a regulator event has
- * occurred. We also notify regulator clients downstream.
- * Note lock must be held by caller.
+ * occurred.
  */
 int regulator_notifier_call_chain(struct regulator_dev *rdev,
 				  unsigned long event, void *data)
 {
-	lockdep_assert_held_once(&rdev->mutex.base);
-
 	_notifier_call_chain(rdev, event, data);
 	return NOTIFY_DONE;
 
diff --git a/drivers/regulator/da9055-regulator.c b/drivers/regulator/da9055-regulator.c
index c025ccb1a30a..73ff5fc7d8d7 100644
--- a/drivers/regulator/da9055-regulator.c
+++ b/drivers/regulator/da9055-regulator.c
@@ -485,10 +485,8 @@ static irqreturn_t da9055_ldo5_6_oc_irq(int irq, void *data)
 {
 	struct da9055_regulator *regulator = data;
 
-	regulator_lock(regulator->rdev);
 	regulator_notifier_call_chain(regulator->rdev,
 				      REGULATOR_EVENT_OVER_CURRENT, NULL);
-	regulator_unlock(regulator->rdev);
 
 	return IRQ_HANDLED;
 }
diff --git a/drivers/regulator/da9062-regulator.c b/drivers/regulator/da9062-regulator.c
index d8112f56e94e..1a6324001027 100644
--- a/drivers/regulator/da9062-regulator.c
+++ b/drivers/regulator/da9062-regulator.c
@@ -907,10 +907,8 @@ static irqreturn_t da9062_ldo_lim_event(int irq, void *data)
 			continue;
 
 		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);
 			handled = IRQ_HANDLED;
 		}
 	}
diff --git a/drivers/regulator/da9063-regulator.c b/drivers/regulator/da9063-regulator.c
index fe65b5acaf28..cf7d5341750e 100644
--- a/drivers/regulator/da9063-regulator.c
+++ b/drivers/regulator/da9063-regulator.c
@@ -574,10 +574,8 @@ static irqreturn_t da9063_ldo_lim_event(int irq, void *data)
 			continue;
 
 		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);
 		}
 	}
 
diff --git a/drivers/regulator/da9210-regulator.c b/drivers/regulator/da9210-regulator.c
index 2aea442b62fe..7493af0b5c04 100644
--- a/drivers/regulator/da9210-regulator.c
+++ b/drivers/regulator/da9210-regulator.c
@@ -77,8 +77,6 @@ static irqreturn_t da9210_irq_handler(int irq, void *data)
 	if (error < 0)
 		goto error_i2c;
 
-	regulator_lock(chip->rdev);
-
 	if (val & DA9210_E_OVCURR) {
 		regulator_notifier_call_chain(chip->rdev,
 					      REGULATOR_EVENT_OVER_CURRENT,
@@ -103,8 +101,6 @@ static irqreturn_t da9210_irq_handler(int irq, void *data)
 		handled |= DA9210_E_VMAX;
 	}
 
-	regulator_unlock(chip->rdev);
-
 	if (handled) {
 		/* Clear handled events */
 		error = regmap_write(chip->regmap, DA9210_REG_EVENT_B, handled);
diff --git a/drivers/regulator/da9211-regulator.c b/drivers/regulator/da9211-regulator.c
index cffcefd0538d..e01b32d1fa17 100644
--- a/drivers/regulator/da9211-regulator.c
+++ b/drivers/regulator/da9211-regulator.c
@@ -346,10 +346,8 @@ static irqreturn_t da9211_irq_handler(int irq, void *data)
 		goto error_i2c;
 
 	if (reg_val & DA9211_E_OV_CURR_A) {
-	        regulator_lock(chip->rdev[0]);
 		regulator_notifier_call_chain(chip->rdev[0],
 			REGULATOR_EVENT_OVER_CURRENT, NULL);
-	        regulator_unlock(chip->rdev[0]);
 
 		err = regmap_write(chip->regmap, DA9211_REG_EVENT_B,
 			DA9211_E_OV_CURR_A);
@@ -360,10 +358,8 @@ static irqreturn_t da9211_irq_handler(int irq, void *data)
 	}
 
 	if (reg_val & DA9211_E_OV_CURR_B) {
-	        regulator_lock(chip->rdev[1]);
 		regulator_notifier_call_chain(chip->rdev[1],
 			REGULATOR_EVENT_OVER_CURRENT, NULL);
-	        regulator_unlock(chip->rdev[1]);
 
 		err = regmap_write(chip->regmap, DA9211_REG_EVENT_B,
 			DA9211_E_OV_CURR_B);
diff --git a/drivers/regulator/lp8755.c b/drivers/regulator/lp8755.c
index 8cc9963023f2..13c535711265 100644
--- a/drivers/regulator/lp8755.c
+++ b/drivers/regulator/lp8755.c
@@ -329,11 +329,9 @@ static irqreturn_t lp8755_irq_handler(int irq, void *data)
 		if ((flag0 & (0x4 << icnt))
 		    && (pchip->irqmask & (0x04 << icnt))
 		    && (pchip->rdev[icnt] != NULL)) {
-			regulator_lock(pchip->rdev[icnt]);
 			regulator_notifier_call_chain(pchip->rdev[icnt],
 						      LP8755_EVENT_PWR_FAULT,
 						      NULL);
-			regulator_unlock(pchip->rdev[icnt]);
 		}
 
 	/* read flag1 register */
@@ -349,22 +347,18 @@ static irqreturn_t lp8755_irq_handler(int irq, void *data)
 	if ((flag1 & 0x01) && (pchip->irqmask & 0x01))
 		for (icnt = 0; icnt < LP8755_BUCK_MAX; icnt++)
 			if (pchip->rdev[icnt] != NULL) {
-				regulator_lock(pchip->rdev[icnt]);
 				regulator_notifier_call_chain(pchip->rdev[icnt],
 							      LP8755_EVENT_OCP,
 							      NULL);
-				regulator_unlock(pchip->rdev[icnt]);
 			}
 
 	/* send OVP event to all regulator devices */
 	if ((flag1 & 0x02) && (pchip->irqmask & 0x02))
 		for (icnt = 0; icnt < LP8755_BUCK_MAX; icnt++)
 			if (pchip->rdev[icnt] != NULL) {
-				regulator_lock(pchip->rdev[icnt]);
 				regulator_notifier_call_chain(pchip->rdev[icnt],
 							      LP8755_EVENT_OVP,
 							      NULL);
-				regulator_unlock(pchip->rdev[icnt]);
 			}
 	return IRQ_HANDLED;
 
diff --git a/drivers/regulator/ltc3589.c b/drivers/regulator/ltc3589.c
index fa563aacf742..38f7ccb63b52 100644
--- a/drivers/regulator/ltc3589.c
+++ b/drivers/regulator/ltc3589.c
@@ -357,22 +357,16 @@ static irqreturn_t ltc3589_isr(int irq, void *dev_id)
 
 	if (irqstat & LTC3589_IRQSTAT_THERMAL_WARN) {
 		event = REGULATOR_EVENT_OVER_TEMP;
-		for (i = 0; i < LTC3589_NUM_REGULATORS; i++) {
-		        regulator_lock(ltc3589->regulators[i]);
+		for (i = 0; i < LTC3589_NUM_REGULATORS; i++)
 			regulator_notifier_call_chain(ltc3589->regulators[i],
 						      event, NULL);
-		        regulator_unlock(ltc3589->regulators[i]);
-		}
 	}
 
 	if (irqstat & LTC3589_IRQSTAT_UNDERVOLT_WARN) {
 		event = REGULATOR_EVENT_UNDER_VOLTAGE;
-		for (i = 0; i < LTC3589_NUM_REGULATORS; i++) {
-		        regulator_lock(ltc3589->regulators[i]);
+		for (i = 0; i < LTC3589_NUM_REGULATORS; i++)
 			regulator_notifier_call_chain(ltc3589->regulators[i],
 						      event, NULL);
-		        regulator_unlock(ltc3589->regulators[i]);
-		}
 	}
 
 	/* Clear warning condition */
diff --git a/drivers/regulator/ltc3676.c b/drivers/regulator/ltc3676.c
index 557727b54f0e..eb3d6bed6d54 100644
--- a/drivers/regulator/ltc3676.c
+++ b/drivers/regulator/ltc3676.c
@@ -276,23 +276,17 @@ static irqreturn_t ltc3676_isr(int irq, void *dev_id)
 	if (irqstat & LTC3676_IRQSTAT_THERMAL_WARN) {
 		dev_warn(dev, "Over-temperature Warning\n");
 		event = REGULATOR_EVENT_OVER_TEMP;
-		for (i = 0; i < LTC3676_NUM_REGULATORS; i++) {
-			regulator_lock(ltc3676->regulators[i]);
+		for (i = 0; i < LTC3676_NUM_REGULATORS; i++)
 			regulator_notifier_call_chain(ltc3676->regulators[i],
 						      event, NULL);
-			regulator_unlock(ltc3676->regulators[i]);
-		}
 	}
 
 	if (irqstat & LTC3676_IRQSTAT_UNDERVOLT_WARN) {
 		dev_info(dev, "Undervoltage Warning\n");
 		event = REGULATOR_EVENT_UNDER_VOLTAGE;
-		for (i = 0; i < LTC3676_NUM_REGULATORS; i++) {
-			regulator_lock(ltc3676->regulators[i]);
+		for (i = 0; i < LTC3676_NUM_REGULATORS; i++)
 			regulator_notifier_call_chain(ltc3676->regulators[i],
 						      event, NULL);
-			regulator_unlock(ltc3676->regulators[i]);
-		}
 	}
 
 	/* Clear warning condition */
diff --git a/drivers/regulator/pv88060-regulator.c b/drivers/regulator/pv88060-regulator.c
index 787ced918372..48238846f45c 100644
--- a/drivers/regulator/pv88060-regulator.c
+++ b/drivers/regulator/pv88060-regulator.c
@@ -233,13 +233,10 @@ static irqreturn_t pv88060_irq_handler(int irq, void *data)
 
 	if (reg_val & PV88060_E_VDD_FLT) {
 		for (i = 0; i < PV88060_MAX_REGULATORS; i++) {
-			if (chip->rdev[i] != NULL) {
-				regulator_lock(chip->rdev[i]);
+			if (chip->rdev[i] != NULL)
 				regulator_notifier_call_chain(chip->rdev[i],
 					REGULATOR_EVENT_UNDER_VOLTAGE,
 					NULL);
-				regulator_unlock(chip->rdev[i]);
-			}
 		}
 
 		err = regmap_write(chip->regmap, PV88060_REG_EVENT_A,
@@ -252,13 +249,10 @@ static irqreturn_t pv88060_irq_handler(int irq, void *data)
 
 	if (reg_val & PV88060_E_OVER_TEMP) {
 		for (i = 0; i < PV88060_MAX_REGULATORS; i++) {
-			if (chip->rdev[i] != NULL) {
-				regulator_lock(chip->rdev[i]);
+			if (chip->rdev[i] != NULL)
 				regulator_notifier_call_chain(chip->rdev[i],
 					REGULATOR_EVENT_OVER_TEMP,
 					NULL);
-				regulator_unlock(chip->rdev[i]);
-			}
 		}
 
 		err = regmap_write(chip->regmap, PV88060_REG_EVENT_A,
diff --git a/drivers/regulator/pv88080-regulator.c b/drivers/regulator/pv88080-regulator.c
index a444f68af1a8..2a74cc05acfe 100644
--- a/drivers/regulator/pv88080-regulator.c
+++ b/drivers/regulator/pv88080-regulator.c
@@ -334,13 +334,10 @@ static irqreturn_t pv88080_irq_handler(int irq, void *data)
 
 	if (reg_val & PV88080_E_VDD_FLT) {
 		for (i = 0; i < PV88080_MAX_REGULATORS; i++) {
-			if (chip->rdev[i] != NULL) {
-			        regulator_lock(chip->rdev[i]);
+			if (chip->rdev[i] != NULL)
 				regulator_notifier_call_chain(chip->rdev[i],
 					REGULATOR_EVENT_UNDER_VOLTAGE,
 					NULL);
-			        regulator_unlock(chip->rdev[i]);
-			}
 		}
 
 		err = regmap_write(chip->regmap, PV88080_REG_EVENT_A,
@@ -353,13 +350,10 @@ static irqreturn_t pv88080_irq_handler(int irq, void *data)
 
 	if (reg_val & PV88080_E_OVER_TEMP) {
 		for (i = 0; i < PV88080_MAX_REGULATORS; i++) {
-			if (chip->rdev[i] != NULL) {
-			        regulator_lock(chip->rdev[i]);
+			if (chip->rdev[i] != NULL)
 				regulator_notifier_call_chain(chip->rdev[i],
 					REGULATOR_EVENT_OVER_TEMP,
 					NULL);
-			        regulator_unlock(chip->rdev[i]);
-			}
 		}
 
 		err = regmap_write(chip->regmap, PV88080_REG_EVENT_A,
diff --git a/drivers/regulator/pv88090-regulator.c b/drivers/regulator/pv88090-regulator.c
index 784729ec2182..a80176bdf8ec 100644
--- a/drivers/regulator/pv88090-regulator.c
+++ b/drivers/regulator/pv88090-regulator.c
@@ -226,13 +226,10 @@ static irqreturn_t pv88090_irq_handler(int irq, void *data)
 
 	if (reg_val & PV88090_E_VDD_FLT) {
 		for (i = 0; i < PV88090_MAX_REGULATORS; i++) {
-			if (chip->rdev[i] != NULL) {
-			        regulator_lock(chip->rdev[i]);
+			if (chip->rdev[i] != NULL)
 				regulator_notifier_call_chain(chip->rdev[i],
 					REGULATOR_EVENT_UNDER_VOLTAGE,
 					NULL);
-			        regulator_unlock(chip->rdev[i]);
-			}
 		}
 
 		err = regmap_write(chip->regmap, PV88090_REG_EVENT_A,
@@ -245,13 +242,10 @@ static irqreturn_t pv88090_irq_handler(int irq, void *data)
 
 	if (reg_val & PV88090_E_OVER_TEMP) {
 		for (i = 0; i < PV88090_MAX_REGULATORS; i++) {
-			if (chip->rdev[i] != NULL) {
-			        regulator_lock(chip->rdev[i]);
+			if (chip->rdev[i] != NULL)
 				regulator_notifier_call_chain(chip->rdev[i],
 					REGULATOR_EVENT_OVER_TEMP,
 					NULL);
-			        regulator_unlock(chip->rdev[i]);
-			}
 		}
 
 		err = regmap_write(chip->regmap, PV88090_REG_EVENT_A,
diff --git a/drivers/regulator/slg51000-regulator.c b/drivers/regulator/slg51000-regulator.c
index 44e4cecbf6de..0f8041981436 100644
--- a/drivers/regulator/slg51000-regulator.c
+++ b/drivers/regulator/slg51000-regulator.c
@@ -386,10 +386,8 @@ static irqreturn_t slg51000_irq_handler(int irq, void *data)
 	for (i = 0; i < SLG51000_MAX_REGULATORS; i++) {
 		if (!(evt[i][R2] & SLG51000_IRQ_ILIM_FLAG_MASK) &&
 		    (evt[i][R0] & SLG51000_EVT_ILIM_FLAG_MASK)) {
-			regulator_lock(chip->rdev[i]);
 			regulator_notifier_call_chain(chip->rdev[i],
 					    REGULATOR_EVENT_OVER_CURRENT, NULL);
-			regulator_unlock(chip->rdev[i]);
 
 			if (evt[i][R1] & SLG51000_STA_ILIM_FLAG_MASK)
 				dev_warn(chip->dev,
@@ -403,10 +401,8 @@ static irqreturn_t slg51000_irq_handler(int irq, void *data)
 		for (i = 0; i < SLG51000_MAX_REGULATORS; i++) {
 			if (!(evt[i][R1] & SLG51000_STA_ILIM_FLAG_MASK) &&
 			    (evt[i][R1] & SLG51000_STA_VOUT_OK_FLAG_MASK)) {
-				regulator_lock(chip->rdev[i]);
 				regulator_notifier_call_chain(chip->rdev[i],
 					       REGULATOR_EVENT_OVER_TEMP, NULL);
-				regulator_unlock(chip->rdev[i]);
 			}
 		}
 		handled = IRQ_HANDLED;
diff --git a/drivers/regulator/stpmic1_regulator.c b/drivers/regulator/stpmic1_regulator.c
index 73e0ab2baeaa..cf10fdb72e32 100644
--- a/drivers/regulator/stpmic1_regulator.c
+++ b/drivers/regulator/stpmic1_regulator.c
@@ -505,15 +505,11 @@ static irqreturn_t stpmic1_curlim_irq_handler(int irq, void *data)
 {
 	struct regulator_dev *rdev = (struct regulator_dev *)data;
 
-	regulator_lock(rdev);
-
 	/* Send an overcurrent notification */
 	regulator_notifier_call_chain(rdev,
 				      REGULATOR_EVENT_OVER_CURRENT,
 				      NULL);
 
-	regulator_unlock(rdev);
-
 	return IRQ_HANDLED;
 }
 
diff --git a/drivers/regulator/wm831x-dcdc.c b/drivers/regulator/wm831x-dcdc.c
index ad2203d11a88..e43ed4d93f71 100644
--- a/drivers/regulator/wm831x-dcdc.c
+++ b/drivers/regulator/wm831x-dcdc.c
@@ -178,11 +178,9 @@ static irqreturn_t wm831x_dcdc_uv_irq(int irq, void *data)
 {
 	struct wm831x_dcdc *dcdc = data;
 
-	regulator_lock(dcdc->regulator);
 	regulator_notifier_call_chain(dcdc->regulator,
 				      REGULATOR_EVENT_UNDER_VOLTAGE,
 				      NULL);
-	regulator_unlock(dcdc->regulator);
 
 	return IRQ_HANDLED;
 }
@@ -191,11 +189,9 @@ static irqreturn_t wm831x_dcdc_oc_irq(int irq, void *data)
 {
 	struct wm831x_dcdc *dcdc = data;
 
-	regulator_lock(dcdc->regulator);
 	regulator_notifier_call_chain(dcdc->regulator,
 				      REGULATOR_EVENT_OVER_CURRENT,
 				      NULL);
-	regulator_unlock(dcdc->regulator);
 
 	return IRQ_HANDLED;
 }
diff --git a/drivers/regulator/wm831x-isink.c b/drivers/regulator/wm831x-isink.c
index ff3d2bf50410..eade3ae3e333 100644
--- a/drivers/regulator/wm831x-isink.c
+++ b/drivers/regulator/wm831x-isink.c
@@ -99,11 +99,9 @@ static irqreturn_t wm831x_isink_irq(int irq, void *data)
 {
 	struct wm831x_isink *isink = data;
 
-	regulator_lock(isink->regulator);
 	regulator_notifier_call_chain(isink->regulator,
 				      REGULATOR_EVENT_OVER_CURRENT,
 				      NULL);
-	regulator_unlock(isink->regulator);
 
 	return IRQ_HANDLED;
 }
diff --git a/drivers/regulator/wm831x-ldo.c b/drivers/regulator/wm831x-ldo.c
index 7b6cf4810cb7..e091b189ecc0 100644
--- a/drivers/regulator/wm831x-ldo.c
+++ b/drivers/regulator/wm831x-ldo.c
@@ -46,11 +46,9 @@ static irqreturn_t wm831x_ldo_uv_irq(int irq, void *data)
 {
 	struct wm831x_ldo *ldo = data;
 
-	regulator_lock(ldo->regulator);
 	regulator_notifier_call_chain(ldo->regulator,
 				      REGULATOR_EVENT_UNDER_VOLTAGE,
 				      NULL);
-	regulator_unlock(ldo->regulator);
 
 	return IRQ_HANDLED;
 }
diff --git a/drivers/regulator/wm8350-regulator.c b/drivers/regulator/wm8350-regulator.c
index 2e7bfdf7c87b..6579bfdb0c26 100644
--- a/drivers/regulator/wm8350-regulator.c
+++ b/drivers/regulator/wm8350-regulator.c
@@ -1089,7 +1089,6 @@ static irqreturn_t pmic_uv_handler(int irq, void *data)
 {
 	struct regulator_dev *rdev = (struct regulator_dev *)data;
 
-	regulator_lock(rdev);
 	if (irq == WM8350_IRQ_CS1 || irq == WM8350_IRQ_CS2)
 		regulator_notifier_call_chain(rdev,
 					      REGULATOR_EVENT_REGULATION_OUT,
@@ -1098,7 +1097,6 @@ static irqreturn_t pmic_uv_handler(int irq, void *data)
 		regulator_notifier_call_chain(rdev,
 					      REGULATOR_EVENT_UNDER_VOLTAGE,
 					      NULL);
-	regulator_unlock(rdev);
 
 	return IRQ_HANDLED;
 }