Re: [PATCH 04/22] Input: cma3000_d0x - use guard notation when acquiring mutex

Using guard notation makes the code more compact and error handling
more robust by ensuring that mutexes are released in all code paths
when control leaves critical section.

Signed-off-by: Dmitry Torokhov <dmitry.torokhov@gmail.com>
---
 drivers/input/misc/cma3000_d0x.c | 16 ++++------------
 1 file changed, 4 insertions(+), 12 deletions(-)

diff --git a/drivers/input/misc/cma3000_d0x.c b/drivers/input/misc/cma3000_d0x.c
index 0c68e924a1cc..cfc12332bee1 100644
--- a/drivers/input/misc/cma3000_d0x.c
+++ b/drivers/input/misc/cma3000_d0x.c

@@ -217,15 +217,13 @@ static int cma3000_open(struct input_dev *input_dev)
 {
 	struct cma3000_accl_data *data = input_get_drvdata(input_dev);
 
-	mutex_lock(&data->mutex);
+	guard(mutex)(&data->mutex);
 
 	if (!data->suspended)
 		cma3000_poweron(data);
 
 	data->opened = true;
 
-	mutex_unlock(&data->mutex);
-
 	return 0;
 }
 

@@ -233,40 +231,34 @@ static void cma3000_close(struct input_dev *input_dev)
 {
 	struct cma3000_accl_data *data = input_get_drvdata(input_dev);
 
-	mutex_lock(&data->mutex);
+	guard(mutex)(&data->mutex);
 
 	if (!data->suspended)
 		cma3000_poweroff(data);
 
 	data->opened = false;
-
-	mutex_unlock(&data->mutex);
 }
 
 void cma3000_suspend(struct cma3000_accl_data *data)
 {
-	mutex_lock(&data->mutex);
+	guard(mutex)(&data->mutex);
 
 	if (!data->suspended && data->opened)
 		cma3000_poweroff(data);
 
 	data->suspended = true;
-
-	mutex_unlock(&data->mutex);
 }
 EXPORT_SYMBOL(cma3000_suspend);
 
 
 void cma3000_resume(struct cma3000_accl_data *data)
 {
-	mutex_lock(&data->mutex);
+	guard(mutex)(&data->mutex);
 
 	if (data->suspended && data->opened)
 		cma3000_poweron(data);
 
 	data->suspended = false;
-
-	mutex_unlock(&data->mutex);
 }
 EXPORT_SYMBOL(cma3000_resume);