linux-kernel - [PATCH 17/24] Input: sa1111ps2 - use guard notation when acquiring spinlock

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Message-ID: <20240905041732.2034348-18-dmitry.torokhov@gmail.com>
Date: Wed,  4 Sep 2024 21:17:22 -0700
From: Dmitry Torokhov <dmitry.torokhov@...il.com>
To: linux-input@...r.kernel.org
Cc: Pali Rohár <pali@...nel.org>,
	Helge Deller <deller@....de>,
	"K. Y. Srinivasan" <kys@...rosoft.com>,
	Wei Liu <wei.liu@...nel.org>,
	Dexuan Cui <decui@...rosoft.com>,
	Samuel Holland <samuel@...lland.org>,
	Lyude Paul <thatslyude@...il.com>,
	Michal Simek <michal.simek@....com>,
	Hans de Goede <hdegoede@...hat.com>,
	linux-kernel@...r.kernel.org,
	linux-hyperv@...r.kernel.org,
	linux-arm-kernel@...ts.infradead.org,
	linux-sunxi@...ts.linux.dev
Subject: [PATCH 17/24] Input: sa1111ps2 - 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/serio/sa1111ps2.c | 8 +++-----
 1 file changed, 3 insertions(+), 5 deletions(-)

diff --git a/drivers/input/serio/sa1111ps2.c b/drivers/input/serio/sa1111ps2.c
index 1311caf7dba4..375c6f5f905c 100644
--- a/drivers/input/serio/sa1111ps2.c
+++ b/drivers/input/serio/sa1111ps2.c
@@ -92,7 +92,8 @@ static irqreturn_t ps2_txint(int irq, void *dev_id)
 	struct ps2if *ps2if = dev_id;
 	unsigned int status;
 
-	spin_lock(&ps2if->lock);
+	guard(spinlock)(&ps2if->lock);
+
 	status = readl_relaxed(ps2if->base + PS2STAT);
 	if (ps2if->head == ps2if->tail) {
 		disable_irq_nosync(irq);
@@ -101,7 +102,6 @@ static irqreturn_t ps2_txint(int irq, void *dev_id)
 		writel_relaxed(ps2if->buf[ps2if->tail], ps2if->base + PS2DATA);
 		ps2if->tail = (ps2if->tail + 1) & (sizeof(ps2if->buf) - 1);
 	}
-	spin_unlock(&ps2if->lock);
 
 	return IRQ_HANDLED;
 }
@@ -113,10 +113,9 @@ static irqreturn_t ps2_txint(int irq, void *dev_id)
 static int ps2_write(struct serio *io, unsigned char val)
 {
 	struct ps2if *ps2if = io->port_data;
-	unsigned long flags;
 	unsigned int head;
 
-	spin_lock_irqsave(&ps2if->lock, flags);
+	guard(spinlock_irqsave)(&ps2if->lock);
 
 	/*
 	 * If the TX register is empty, we can go straight out.
@@ -133,7 +132,6 @@ static int ps2_write(struct serio *io, unsigned char val)
 		}
 	}
 
-	spin_unlock_irqrestore(&ps2if->lock, flags);
 	return 0;
 }
 
-- 
2.46.0.469.g59c65b2a67-goog