iio: adc: lpc32xx_adc: do not use internal iio_dev lock

The iio_device lock is only meant for internal use. Hence define a
device local lock to protect against concurrent accesses.

While at it, properly include "mutex.h" for mutex related APIs.

Signed-off-by: Nuno Sá <[e-mail]>
Link: https://lore.kernel.org/r/[e-mail]
Signed-off-by: Jonathan Cameron <[e-mail]>

drivers/iio/adc/lpc32xx_adc.c

···
 #include <linux/io.h>
 #include <linux/module.h>
 #include <linux/mod_devicetable.h>
+#include <linux/mutex.h>
 #include <linux/platform_device.h>
 #include <linux/regulator/consumer.h>
 
···
 	struct clk *clk;
 	struct completion completion;
 	struct regulator *vref;
+	/* lock to protect against multiple access to the device */
+	struct mutex lock;
 
 	u32 value;
 };
···
 
 	switch (mask) {
 	case IIO_CHAN_INFO_RAW:
-		mutex_lock(&indio_dev->mlock);
+		mutex_lock(&st->lock);
 		ret = clk_prepare_enable(st->clk);
 		if (ret) {
-			mutex_unlock(&indio_dev->mlock);
+			mutex_unlock(&st->lock);
 			return ret;
 		}
 		/* Measurement setup */
···
 		wait_for_completion(&st->completion); /* set by ISR */
 		clk_disable_unprepare(st->clk);
 		*val = st->value;
-		mutex_unlock(&indio_dev->mlock);
+		mutex_unlock(&st->lock);
 
 		return IIO_VAL_INT;
 
···
 	iodev->info = &lpc32xx_adc_iio_info;
 	iodev->modes = INDIO_DIRECT_MODE;
 	iodev->num_channels = ARRAY_SIZE(lpc32xx_adc_iio_channels);
+
+	mutex_init(&st->lock);
 
 	retval = devm_iio_device_register(&pdev->dev, iodev);
 	if (retval)