linux-kernel - [PATCH 01/22] Input: ad714x - use guard notation when acquiring mutex

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Message-ID: <20240904044244.1042174-2-dmitry.torokhov@gmail.com>
Date: Tue,  3 Sep 2024 21:42:21 -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 01/22] Input: ad714x - 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@...il.com>
---
 drivers/input/misc/ad714x.c | 12 +++---------
 1 file changed, 3 insertions(+), 9 deletions(-)

diff --git a/drivers/input/misc/ad714x.c b/drivers/input/misc/ad714x.c
index 1acd8429c56c..d106f37df6bc 100644
--- a/drivers/input/misc/ad714x.c
+++ b/drivers/input/misc/ad714x.c
@@ -941,7 +941,7 @@ static irqreturn_t ad714x_interrupt_thread(int irq, void *data)
 	struct ad714x_chip *ad714x = data;
 	int i;
 
-	mutex_lock(&ad714x->mutex);
+	guard(mutex)(&ad714x->mutex);
 
 	ad714x->read(ad714x, STG_LOW_INT_STA_REG, &ad714x->l_state, 3);
 
@@ -954,8 +954,6 @@ static irqreturn_t ad714x_interrupt_thread(int irq, void *data)
 	for (i = 0; i < ad714x->hw->touchpad_num; i++)
 		ad714x_touchpad_state_machine(ad714x, i);
 
-	mutex_unlock(&ad714x->mutex);
-
 	return IRQ_HANDLED;
 }
 
@@ -1169,13 +1167,11 @@ static int ad714x_suspend(struct device *dev)
 
 	dev_dbg(ad714x->dev, "%s enter\n", __func__);
 
-	mutex_lock(&ad714x->mutex);
+	guard(mutex)(&ad714x->mutex);
 
 	data = ad714x->hw->sys_cfg_reg[AD714X_PWR_CTRL] | 0x3;
 	ad714x->write(ad714x, AD714X_PWR_CTRL, data);
 
-	mutex_unlock(&ad714x->mutex);
-
 	return 0;
 }
 
@@ -1184,7 +1180,7 @@ static int ad714x_resume(struct device *dev)
 	struct ad714x_chip *ad714x = dev_get_drvdata(dev);
 	dev_dbg(ad714x->dev, "%s enter\n", __func__);
 
-	mutex_lock(&ad714x->mutex);
+	guard(mutex)(&ad714x->mutex);
 
 	/* resume to non-shutdown mode */
 
@@ -1197,8 +1193,6 @@ static int ad714x_resume(struct device *dev)
 
 	ad714x->read(ad714x, STG_LOW_INT_STA_REG, &ad714x->l_state, 3);
 
-	mutex_unlock(&ad714x->mutex);
-
 	return 0;
 }
 
-- 
2.46.0.469.g59c65b2a67-goog