linux-kernel - [PATCH 05/22] Input: da7280 - use guard notation when acquiring mutex and spinlock

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Message-ID: <20240904044244.1042174-6-dmitry.torokhov@gmail.com>
Date: Tue,  3 Sep 2024 21:42:25 -0700
From: Dmitry Torokhov <dmitry.torokhov@...il.com>
To: linux-input@...r.kernel.org
Cc: Michael Hennerich <michael.hennerich@...log.com>,
	Ville Syrjala <syrjala@....fi>,
	Support Opensource <support.opensource@...semi.com>,
	Eddie James <eajames@...ux.ibm.com>,
	Andrey Moiseev <o2g.org.ru@...il.com>,
	Hans de Goede <hdegoede@...hat.com>,
	Javier Carrasco <javier.carrasco.cruz@...il.com>,
	Jeff LaBundy <jeff@...undy.com>,
	linux-kernel@...r.kernel.org
Subject: [PATCH 05/22] Input: da7280 - use guard notation when acquiring mutex and spinlock

Using guard notation 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@...il.com>
---
 drivers/input/misc/da7280.c | 26 ++++++++++++--------------
 1 file changed, 12 insertions(+), 14 deletions(-)

diff --git a/drivers/input/misc/da7280.c b/drivers/input/misc/da7280.c
index 1629b7ea4cbd..e4a605c6af15 100644
--- a/drivers/input/misc/da7280.c
+++ b/drivers/input/misc/da7280.c
@@ -1263,39 +1263,37 @@ static int da7280_suspend(struct device *dev)
 {
 	struct da7280_haptic *haptics = dev_get_drvdata(dev);
 
-	mutex_lock(&haptics->input_dev->mutex);
+	guard(mutex)(&haptics->input_dev->mutex);
 
 	/*
 	 * Make sure no new requests will be submitted while device is
 	 * suspended.
 	 */
-	spin_lock_irq(&haptics->input_dev->event_lock);
-	haptics->suspended = true;
-	spin_unlock_irq(&haptics->input_dev->event_lock);
+	scoped_guard(spinlock_irq, &haptics->input_dev->event_lock) {
+		haptics->suspended = true;
+	}
 
 	da7280_haptic_stop(haptics);
 
-	mutex_unlock(&haptics->input_dev->mutex);
-
 	return 0;
 }
 
 static int da7280_resume(struct device *dev)
 {
 	struct da7280_haptic *haptics = dev_get_drvdata(dev);
-	int retval;
+	int error;
 
-	mutex_lock(&haptics->input_dev->mutex);
+	guard(mutex)(&haptics->input_dev->mutex);
 
-	retval = da7280_haptic_start(haptics);
-	if (!retval) {
-		spin_lock_irq(&haptics->input_dev->event_lock);
+	error = da7280_haptic_start(haptics);
+	if (error)
+		return error;
+
+	scoped_guard(spinlock_irq, &haptics->input_dev->event_lock) {
 		haptics->suspended = false;
-		spin_unlock_irq(&haptics->input_dev->event_lock);
 	}
 
-	mutex_unlock(&haptics->input_dev->mutex);
-	return retval;
+	return 0;
 }
 
 #ifdef CONFIG_OF
-- 
2.46.0.469.g59c65b2a67-goog