linux-kernel - [PATCH 22/24] Input: sun4i-ps2 - use guard notation when acquiring spinlock

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Message-ID: <20240905041732.2034348-23-dmitry.torokhov@gmail.com>
Date: Wed,  4 Sep 2024 21:17:27 -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 22/24] Input: sun4i-ps2 - 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/sun4i-ps2.c | 8 ++------
 1 file changed, 2 insertions(+), 6 deletions(-)

diff --git a/drivers/input/serio/sun4i-ps2.c b/drivers/input/serio/sun4i-ps2.c
index 95cd8aaee65d..267214ca9b51 100644
--- a/drivers/input/serio/sun4i-ps2.c
+++ b/drivers/input/serio/sun4i-ps2.c
@@ -101,7 +101,7 @@ static irqreturn_t sun4i_ps2_interrupt(int irq, void *dev_id)
 	unsigned int rxflags = 0;
 	u32 rval;
 
-	spin_lock(&drvdata->lock);
+	guard(spinlock)(&drvdata->lock);
 
 	/* Get the PS/2 interrupts and clear them */
 	intr_status  = readl(drvdata->reg_base + PS2_REG_LSTS);
@@ -134,8 +134,6 @@ static irqreturn_t sun4i_ps2_interrupt(int irq, void *dev_id)
 	writel(intr_status, drvdata->reg_base + PS2_REG_LSTS);
 	writel(fifo_status, drvdata->reg_base + PS2_REG_FSTS);
 
-	spin_unlock(&drvdata->lock);
-
 	return IRQ_HANDLED;
 }
 
@@ -146,7 +144,6 @@ static int sun4i_ps2_open(struct serio *serio)
 	u32 clk_scdf;
 	u32 clk_pcdf;
 	u32 rval;
-	unsigned long flags;
 
 	/* Set line control and enable interrupt */
 	rval = PS2_LCTL_STOPERREN | PS2_LCTL_ACKERREN
@@ -171,9 +168,8 @@ static int sun4i_ps2_open(struct serio *serio)
 	rval = PS2_GCTL_RESET | PS2_GCTL_INTEN | PS2_GCTL_MASTER
 		| PS2_GCTL_BUSEN;
 
-	spin_lock_irqsave(&drvdata->lock, flags);
+	guard(spinlock_irqsave)(&drvdata->lock);
 	writel(rval, drvdata->reg_base + PS2_REG_GCTL);
-	spin_unlock_irqrestore(&drvdata->lock, flags);
 
 	return 0;
 }
-- 
2.46.0.469.g59c65b2a67-goog