Input: omap4-keypad - use guard notation when acquiring mutex

This 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.

Link: https://lore.kernel.org/r/20240825051627.2848495-13-dmitry.torokhov@gmail.com
Signed-off-by: Dmitry Torokhov <dmitry.torokhov@gmail.com>

diff --git a/drivers/input/keyboard/omap4-keypad.c b/drivers/input/keyboard/omap4-keypad.c
index 040b340..935c2b2 100644 (file)
--- a/drivers/input/keyboard/omap4-keypad.c
+++ b/drivers/input/keyboard/omap4-keypad.c
@@ -144,7 +144,7 @@ static void omap4_keypad_scan_keys(struct omap4_keypad *keypad_data, u64 keys)
 {
        u64 changed;
 
-       mutex_lock(&keypad_data->lock);
+       guard(mutex)(&keypad_data->lock);
 
        changed = keys ^ keypad_data->keys;
 
@@ -158,8 +158,6 @@ static void omap4_keypad_scan_keys(struct omap4_keypad *keypad_data, u64 keys)
        omap4_keypad_report_keys(keypad_data, changed & keys, true);
 
        keypad_data->keys = keys;
-
-       mutex_unlock(&keypad_data->lock);
 }
 
 /* Interrupt handlers */