Merge tag 'char-misc-6.9-rc1' of git://git.kernel.org/pub/scm/linux/kernel/git/gregkh/char-misc

Pull char/misc and other driver subsystem updates from Greg KH:
 "Here is the big set of char/misc and a number of other driver
  subsystem updates for 6.9-rc1. Included in here are:

   - IIO driver updates, loads of new ones and evolution of existing ones

   - coresight driver updates

   - const cleanups for many driver subsystems

   - speakup driver additions

   - platform remove callback void cleanups

   - mei driver updates

   - mhi driver updates

   - cdx driver updates for MSI interrupt handling

   - nvmem driver updates

   - other smaller driver updates and cleanups, full details in the
    shortlog

  All of these have been in linux-next for a long time with no reported
  issue, other than a build warning for the speakup driver"

The build warning hits clang and is a gcc (and C23) extension, and is
fixed up in the merge.

Link: https://lore.kernel.org/all/20240321134831.GA2762840@dev-arch.thelio-3990X/

* tag 'char-misc-6.9-rc1' of git://git.kernel.org/pub/scm/linux/kernel/git/gregkh/char-misc: (279 commits)
  binder: remove redundant variable page_addr
  uio_dmem_genirq: UIO_MEM_DMA_COHERENT conversion
  uio_pruss: UIO_MEM_DMA_COHERENT conversion
  cnic,bnx2,bnx2x: use UIO_MEM_DMA_COHERENT
  uio: introduce UIO_MEM_DMA_COHERENT type
  cdx: add MSI support for CDX bus
  pps: use cflags-y instead of EXTRA_CFLAGS
  speakup: Add /dev/synthu device
  speakup: Fix 8bit characters from direct synth
  parport: sunbpp: Convert to platform remove callback returning void
  parport: amiga: Convert to platform remove callback returning void
  char: xillybus: Convert to platform remove callback returning void
  vmw_balloon: change maintainership
  MAINTAINERS: change the maintainer for hpilo driver
  char: xilinx_hwicap: Fix NULL vs IS_ERR() bug
  hpet: remove hpets::hp_clocksource
  platform: goldfish: move the separate 'default' propery for CONFIG_GOLDFISH
  char: xilinx_hwicap: drop casting to void in dev_set_drvdata
  greybus: move is_gb_* functions out of greybus.h
  greybus: Remove usage of the deprecated ida_simple_xx() API
  ...

1 files changed, 89 insertions, 96 deletions

diff --git a/drivers/iio/dummy/iio_simple_dummy.c b/drivers/iio/dummy/iio_simple_dummy.c
index c24f609c2ade6d..09efacaf8f78de 100644
--- a/drivers/iio/dummy/iio_simple_dummy.c
+++ b/drivers/iio/dummy/iio_simple_dummy.c
@@ -283,65 +283,63 @@ static int iio_dummy_read_raw(struct iio_dev *indio_dev,
 			      long mask)
 {
 	struct iio_dummy_state *st = iio_priv(indio_dev);
-	int ret = -EINVAL;
 
-	mutex_lock(&st->lock);
 	switch (mask) {
 	case IIO_CHAN_INFO_RAW: /* magic value - channel value read */
-		switch (chan->type) {
-		case IIO_VOLTAGE:
-			if (chan->output) {
-				/* Set integer part to cached value */
-				*val = st->dac_val;
-				ret = IIO_VAL_INT;
-			} else if (chan->differential) {
-				if (chan->channel == 1)
-					*val = st->differential_adc_val[0];
-				else
-					*val = st->differential_adc_val[1];
-				ret = IIO_VAL_INT;
-			} else {
-				*val = st->single_ended_adc_val;
-				ret = IIO_VAL_INT;
+		iio_device_claim_direct_scoped(return -EBUSY, indio_dev) {
+			guard(mutex)(&st->lock);
+			switch (chan->type) {
+			case IIO_VOLTAGE:
+				if (chan->output) {
+					/* Set integer part to cached value */
+					*val = st->dac_val;
+					return IIO_VAL_INT;
+				} else if (chan->differential) {
+					if (chan->channel == 1)
+						*val = st->differential_adc_val[0];
+					else
+						*val = st->differential_adc_val[1];
+					return IIO_VAL_INT;
+				} else {
+					*val = st->single_ended_adc_val;
+					return IIO_VAL_INT;
+				}
+
+			case IIO_ACCEL:
+				*val = st->accel_val;
+				return IIO_VAL_INT;
+			default:
+				return -EINVAL;
 			}
-			break;
-		case IIO_ACCEL:
-			*val = st->accel_val;
-			ret = IIO_VAL_INT;
-			break;
-		default:
-			break;
 		}
-		break;
+		unreachable();
 	case IIO_CHAN_INFO_PROCESSED:
-		switch (chan->type) {
-		case IIO_STEPS:
-			*val = st->steps;
-			ret = IIO_VAL_INT;
-			break;
-		case IIO_ACTIVITY:
-			switch (chan->channel2) {
-			case IIO_MOD_RUNNING:
-				*val = st->activity_running;
-				ret = IIO_VAL_INT;
-				break;
-			case IIO_MOD_WALKING:
-				*val = st->activity_walking;
-				ret = IIO_VAL_INT;
-				break;
+		iio_device_claim_direct_scoped(return -EBUSY, indio_dev) {
+			guard(mutex)(&st->lock);
+			switch (chan->type) {
+			case IIO_STEPS:
+				*val = st->steps;
+				return IIO_VAL_INT;
+			case IIO_ACTIVITY:
+				switch (chan->channel2) {
+				case IIO_MOD_RUNNING:
+					*val = st->activity_running;
+					return IIO_VAL_INT;
+				case IIO_MOD_WALKING:
+					*val = st->activity_walking;
+					return IIO_VAL_INT;
+				default:
+					return -EINVAL;
+				}
 			default:
-				break;
+				return -EINVAL;
 			}
-			break;
-		default:
-			break;
 		}
-		break;
+		unreachable();
 	case IIO_CHAN_INFO_OFFSET:
 		/* only single ended adc -> 7 */
 		*val = 7;
-		ret = IIO_VAL_INT;
-		break;
+		return IIO_VAL_INT;
 	case IIO_CHAN_INFO_SCALE:
 		switch (chan->type) {
 		case IIO_VOLTAGE:
@@ -350,60 +348,57 @@ static int iio_dummy_read_raw(struct iio_dev *indio_dev,
 				/* only single ended adc -> 0.001333 */
 				*val = 0;
 				*val2 = 1333;
-				ret = IIO_VAL_INT_PLUS_MICRO;
-				break;
+				return IIO_VAL_INT_PLUS_MICRO;
 			case 1:
 				/* all differential adc -> 0.000001344 */
 				*val = 0;
 				*val2 = 1344;
-				ret = IIO_VAL_INT_PLUS_NANO;
+				return IIO_VAL_INT_PLUS_NANO;
+			default:
+				return -EINVAL;
 			}
-			break;
 		default:
-			break;
+			return -EINVAL;
 		}
-		break;
-	case IIO_CHAN_INFO_CALIBBIAS:
+	case IIO_CHAN_INFO_CALIBBIAS: {
+		guard(mutex)(&st->lock);
 		/* only the acceleration axis - read from cache */
 		*val = st->accel_calibbias;
-		ret = IIO_VAL_INT;
-		break;
-	case IIO_CHAN_INFO_CALIBSCALE:
+		return IIO_VAL_INT;
+	}
+	case IIO_CHAN_INFO_CALIBSCALE: {
+		guard(mutex)(&st->lock);
 		*val = st->accel_calibscale->val;
 		*val2 = st->accel_calibscale->val2;
-		ret = IIO_VAL_INT_PLUS_MICRO;
-		break;
+		return IIO_VAL_INT_PLUS_MICRO;
+	}
 	case IIO_CHAN_INFO_SAMP_FREQ:
 		*val = 3;
 		*val2 = 33;
-		ret = IIO_VAL_INT_PLUS_NANO;
-		break;
-	case IIO_CHAN_INFO_ENABLE:
+		return IIO_VAL_INT_PLUS_NANO;
+	case IIO_CHAN_INFO_ENABLE: {
+		guard(mutex)(&st->lock);
 		switch (chan->type) {
 		case IIO_STEPS:
 			*val = st->steps_enabled;
-			ret = IIO_VAL_INT;
-			break;
+			return IIO_VAL_INT;
 		default:
-			break;
+			return -EINVAL;
 		}
-		break;
-	case IIO_CHAN_INFO_CALIBHEIGHT:
+	}
+	case IIO_CHAN_INFO_CALIBHEIGHT: {
+		guard(mutex)(&st->lock);
 		switch (chan->type) {
 		case IIO_STEPS:
 			*val = st->height;
-			ret = IIO_VAL_INT;
-			break;
+			return IIO_VAL_INT;
 		default:
-			break;
+			return -EINVAL;
 		}
-		break;
-
+	}
 	default:
-		break;
+		return -EINVAL;
 	}
-	mutex_unlock(&st->lock);
-	return ret;
 }
 
 /**
@@ -426,7 +421,6 @@ static int iio_dummy_write_raw(struct iio_dev *indio_dev,
 			       long mask)
 {
 	int i;
-	int ret = 0;
 	struct iio_dummy_state *st = iio_priv(indio_dev);
 
 	switch (mask) {
@@ -436,10 +430,10 @@ static int iio_dummy_write_raw(struct iio_dev *indio_dev,
 			if (chan->output == 0)
 				return -EINVAL;
 
-			/* Locking not required as writing single value */
-			mutex_lock(&st->lock);
-			st->dac_val = val;
-			mutex_unlock(&st->lock);
+			scoped_guard(mutex, &st->lock) {
+				/* Locking not required as writing single value */
+				st->dac_val = val;
+			}
 			return 0;
 		default:
 			return -EINVAL;
@@ -447,9 +441,9 @@ static int iio_dummy_write_raw(struct iio_dev *indio_dev,
 	case IIO_CHAN_INFO_PROCESSED:
 		switch (chan->type) {
 		case IIO_STEPS:
-			mutex_lock(&st->lock);
-			st->steps = val;
-			mutex_unlock(&st->lock);
+			scoped_guard(mutex, &st->lock) {
+				st->steps = val;
+			}
 			return 0;
 		case IIO_ACTIVITY:
 			if (val < 0)
@@ -470,30 +464,29 @@ static int iio_dummy_write_raw(struct iio_dev *indio_dev,
 		default:
 			return -EINVAL;
 		}
-	case IIO_CHAN_INFO_CALIBSCALE:
-		mutex_lock(&st->lock);
+	case IIO_CHAN_INFO_CALIBSCALE: {
+		guard(mutex)(&st->lock);
 		/* Compare against table - hard matching here */
 		for (i = 0; i < ARRAY_SIZE(dummy_scales); i++)
 			if (val == dummy_scales[i].val &&
 			    val2 == dummy_scales[i].val2)
 				break;
 		if (i == ARRAY_SIZE(dummy_scales))
-			ret = -EINVAL;
-		else
-			st->accel_calibscale = &dummy_scales[i];
-		mutex_unlock(&st->lock);
-		return ret;
+			return -EINVAL;
+		st->accel_calibscale = &dummy_scales[i];
+		return 0;
+	}
 	case IIO_CHAN_INFO_CALIBBIAS:
-		mutex_lock(&st->lock);
-		st->accel_calibbias = val;
-		mutex_unlock(&st->lock);
+		scoped_guard(mutex, &st->lock) {
+			st->accel_calibbias = val;
+		}
 		return 0;
 	case IIO_CHAN_INFO_ENABLE:
 		switch (chan->type) {
 		case IIO_STEPS:
-			mutex_lock(&st->lock);
-			st->steps_enabled = val;
-			mutex_unlock(&st->lock);
+			scoped_guard(mutex, &st->lock) {
+				st->steps_enabled = val;
+			}
 			return 0;
 		default:
 			return -EINVAL;