[PATCH 06/17] Input: imx_keypad - use guard notation when acquiring mutex

[Dmitry Torokhov]

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.

Signed-off-by: Dmitry Torokhov <dmitry.torokhov at gmail.com>
---
 drivers/input/keyboard/imx_keypad.c | 27 +++++++++++----------------
 1 file changed, 11 insertions(+), 16 deletions(-)

diff --git a/drivers/input/keyboard/imx_keypad.c b/drivers/input/keyboard/imx_keypad.c
index e15a93619e82..b92268ddfd84 100644
--- a/drivers/input/keyboard/imx_keypad.c
+++ b/drivers/input/keyboard/imx_keypad.c
@@ -521,13 +521,11 @@ static int __maybe_unused imx_kbd_noirq_suspend(struct device *dev)
 	struct input_dev *input_dev = kbd->input_dev;
 	unsigned short reg_val = readw(kbd->mmio_base + KPSR);
 
-	/* imx kbd can wake up system even clock is disabled */
-	mutex_lock(&input_dev->mutex);
-
-	if (input_device_enabled(input_dev))
-		clk_disable_unprepare(kbd->clk);
-
-	mutex_unlock(&input_dev->mutex);
+	scoped_guard(mutex, &input_dev->mutex) {
+		/* imx kbd can wake up system even clock is disabled */
+		if (input_device_enabled(input_dev))
+			clk_disable_unprepare(kbd->clk);
+	}
 
 	if (device_may_wakeup(&pdev->dev)) {
 		if (reg_val & KBD_STAT_KPKD)
@@ -547,23 +545,20 @@ static int __maybe_unused imx_kbd_noirq_resume(struct device *dev)
 	struct platform_device *pdev = to_platform_device(dev);
 	struct imx_keypad *kbd = platform_get_drvdata(pdev);
 	struct input_dev *input_dev = kbd->input_dev;
-	int ret = 0;
+	int error;
 
 	if (device_may_wakeup(&pdev->dev))
 		disable_irq_wake(kbd->irq);
 
-	mutex_lock(&input_dev->mutex);
+	guard(mutex)(&input_dev->mutex);
 
 	if (input_device_enabled(input_dev)) {
-		ret = clk_prepare_enable(kbd->clk);
-		if (ret)
-			goto err_clk;
+		error = clk_prepare_enable(kbd->clk);
+		if (error)
+			return error;
 	}
 
-err_clk:
-	mutex_unlock(&input_dev->mutex);
-
-	return ret;
+	return 0;
 }
 
 static const struct dev_pm_ops imx_kbd_pm_ops = {
-- 
2.46.0.295.g3b9ea8a38a-goog