[PATCH 07/17] Input: ipaq-micro-keys - use guard notation when acquiring mutex and spinlock

[Dmitry Torokhov]

This makes the code more compact and error handling more robust
by ensuring that locks are released in all code paths when control
leaves critical section.

Signed-off-by: Dmitry Torokhov <dmitry.torokhov at gmail.com>
---
 drivers/input/keyboard/ipaq-micro-keys.c | 12 +++++-------
 1 file changed, 5 insertions(+), 7 deletions(-)

diff --git a/drivers/input/keyboard/ipaq-micro-keys.c b/drivers/input/keyboard/ipaq-micro-keys.c
index 1d71dd79ffd2..58631bf7ce55 100644
--- a/drivers/input/keyboard/ipaq-micro-keys.c
+++ b/drivers/input/keyboard/ipaq-micro-keys.c
@@ -54,18 +54,18 @@ static void micro_key_receive(void *data, int len, unsigned char *msg)
 
 static void micro_key_start(struct ipaq_micro_keys *keys)
 {
-	spin_lock(&keys->micro->lock);
+	guard(spinlock)(&keys->micro->lock);
+
 	keys->micro->key = micro_key_receive;
 	keys->micro->key_data = keys;
-	spin_unlock(&keys->micro->lock);
 }
 
 static void micro_key_stop(struct ipaq_micro_keys *keys)
 {
-	spin_lock(&keys->micro->lock);
+	guard(spinlock)(&keys->micro->lock);
+
 	keys->micro->key = NULL;
 	keys->micro->key_data = NULL;
-	spin_unlock(&keys->micro->lock);
 }
 
 static int micro_key_open(struct input_dev *input)
@@ -141,13 +141,11 @@ static int micro_key_resume(struct device *dev)
 	struct ipaq_micro_keys *keys = dev_get_drvdata(dev);
 	struct input_dev *input = keys->input;
 
-	mutex_lock(&input->mutex);
+	guard(mutex)(&input->mutex);
 
 	if (input_device_enabled(input))
 		micro_key_start(keys);
 
-	mutex_unlock(&input->mutex);
-
 	return 0;
 }
 
-- 
2.46.0.295.g3b9ea8a38a-goog