diff mbox series

[v2,07/16] iio: adc: rockchip_saradc: do not use internal iio_dev lock

Message ID 20221004134909.1692021-8-nuno.sa@analog.com (mailing list archive)
State Accepted
Headers show
Series Make 'mlock' really private | expand

Commit Message

Nuno Sa Oct. 4, 2022, 1:49 p.m. UTC 
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 <nuno.sa@analog.com>
---
 drivers/iio/adc/rockchip_saradc.c | 15 ++++++++++-----
 1 file changed, 10 insertions(+), 5 deletions(-)

Comments

Jonathan Cameron Oct. 9, 2022, 12:03 p.m. UTC | #1 
On Wed, 05 Oct 2022 09:44:37 +0200
Heiko Stübner <heiko@sntech.de> wrote:

> Am Dienstag, 4. Oktober 2022, 15:49:00 CEST schrieb Nuno Sá:
> > 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 <nuno.sa@analog.com>  
> 
> Acked-by: Heiko Stuebner <heiko@sntech.de>
> 
> 
Applied and pushed out as testing. Note I'll be rebasing on rc1 once available.

Thanks,

Jonathan
diff mbox series

Patch

diff --git a/drivers/iio/adc/rockchip_saradc.c b/drivers/iio/adc/rockchip_saradc.c
index b87ea7148b58..79448c5ffc2a 100644
--- a/drivers/iio/adc/rockchip_saradc.c
+++ b/drivers/iio/adc/rockchip_saradc.c
@@ -5,6 +5,7 @@ 
  */
 
 #include <linux/module.h>
+#include <linux/mutex.h>
 #include <linux/platform_device.h>
 #include <linux/interrupt.h>
 #include <linux/io.h>
@@ -49,6 +50,8 @@  struct rockchip_saradc {
 	struct clk		*clk;
 	struct completion	completion;
 	struct regulator	*vref;
+	/* lock to protect against multiple access to the device */
+	struct mutex		lock;
 	int			uv_vref;
 	struct reset_control	*reset;
 	const struct rockchip_saradc_data *data;
@@ -94,17 +97,17 @@  static int rockchip_saradc_read_raw(struct iio_dev *indio_dev,
 
 	switch (mask) {
 	case IIO_CHAN_INFO_RAW:
-		mutex_lock(&indio_dev->mlock);
+		mutex_lock(&info->lock);
 
 		ret = rockchip_saradc_conversion(info, chan);
 		if (ret) {
 			rockchip_saradc_power_down(info);
-			mutex_unlock(&indio_dev->mlock);
+			mutex_unlock(&info->lock);
 			return ret;
 		}
 
 		*val = info->last_val;
-		mutex_unlock(&indio_dev->mlock);
+		mutex_unlock(&info->lock);
 		return IIO_VAL_INT;
 	case IIO_CHAN_INFO_SCALE:
 		*val = info->uv_vref / 1000;
@@ -270,7 +273,7 @@  static irqreturn_t rockchip_saradc_trigger_handler(int irq, void *p)
 	int ret;
 	int i, j = 0;
 
-	mutex_lock(&i_dev->mlock);
+	mutex_lock(&info->lock);
 
 	for_each_set_bit(i, i_dev->active_scan_mask, i_dev->masklength) {
 		const struct iio_chan_spec *chan = &i_dev->channels[i];
@@ -287,7 +290,7 @@  static irqreturn_t rockchip_saradc_trigger_handler(int irq, void *p)
 
 	iio_push_to_buffers_with_timestamp(i_dev, &data, iio_get_time_ns(i_dev));
 out:
-	mutex_unlock(&i_dev->mlock);
+	mutex_unlock(&info->lock);
 
 	iio_trigger_notify_done(i_dev->trig);
 
@@ -478,6 +481,8 @@  static int rockchip_saradc_probe(struct platform_device *pdev)
 	if (ret)
 		return ret;
 
+	mutex_init(&info->lock);
+
 	return devm_iio_device_register(&pdev->dev, indio_dev);
 }