linux-kernel - [PATCH 22/22] Input: sparcspkr - use guard notation when acquiring spinlock

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Message-ID: <20240904044938.1049843-1-dmitry.torokhov@gmail.com>
Date: Tue,  3 Sep 2024 21:49:37 -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 22/22] Input: sparcspkr - use guard notation when acquiring 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/sparcspkr.c | 10 ++--------
 1 file changed, 2 insertions(+), 8 deletions(-)

diff --git a/drivers/input/misc/sparcspkr.c b/drivers/input/misc/sparcspkr.c
index 20020cbc0752..5de59ae90c67 100644
--- a/drivers/input/misc/sparcspkr.c
+++ b/drivers/input/misc/sparcspkr.c
@@ -69,7 +69,6 @@ static int bbc_spkr_event(struct input_dev *dev, unsigned int type, unsigned int
 	struct sparcspkr_state *state = dev_get_drvdata(dev->dev.parent);
 	struct bbc_beep_info *info = &state->u.bbc;
 	unsigned int count = 0;
-	unsigned long flags;
 
 	if (type != EV_SND)
 		return -1;
@@ -85,7 +84,7 @@ static int bbc_spkr_event(struct input_dev *dev, unsigned int type, unsigned int
 
 	count = bbc_count_to_reg(info, count);
 
-	spin_lock_irqsave(&state->lock, flags);
+	guard(spinlock_irqsave)(&state->lock);
 
 	if (count) {
 		sbus_writeb(0x01,                 info->regs + 0);
@@ -97,8 +96,6 @@ static int bbc_spkr_event(struct input_dev *dev, unsigned int type, unsigned int
 		sbus_writeb(0x00,                 info->regs + 0);
 	}
 
-	spin_unlock_irqrestore(&state->lock, flags);
-
 	return 0;
 }
 
@@ -107,7 +104,6 @@ static int grover_spkr_event(struct input_dev *dev, unsigned int type, unsigned
 	struct sparcspkr_state *state = dev_get_drvdata(dev->dev.parent);
 	struct grover_beep_info *info = &state->u.grover;
 	unsigned int count = 0;
-	unsigned long flags;
 
 	if (type != EV_SND)
 		return -1;
@@ -121,7 +117,7 @@ static int grover_spkr_event(struct input_dev *dev, unsigned int type, unsigned
 	if (value > 20 && value < 32767)
 		count = 1193182 / value;
 
-	spin_lock_irqsave(&state->lock, flags);
+	guard(spinlock_irqsave)(&state->lock);
 
 	if (count) {
 		/* enable counter 2 */
@@ -136,8 +132,6 @@ static int grover_spkr_event(struct input_dev *dev, unsigned int type, unsigned
 		sbus_writeb(sbus_readb(info->enable_reg) & 0xFC, info->enable_reg);
 	}
 
-	spin_unlock_irqrestore(&state->lock, flags);
-
 	return 0;
 }
 
-- 
2.46.0.469.g59c65b2a67-goog