linux-kernel - [PATCH] Input: hilkbd - use guard notation when acquiring spinlock

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Message-ID: <Zxr30BpPobpM65vO@google.com>
Date: Thu, 24 Oct 2024 18:43:44 -0700
From: Dmitry Torokhov <dmitry.torokhov@...il.com>
To: Helge Deller <deller@....de>
Cc: linux-input@...r.kernel.org, linux-kernel@...r.kernel.org
Subject: [PATCH] Input: hilkbd - 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/keyboard/hilkbd.c | 4 +---
 1 file changed, 1 insertion(+), 3 deletions(-)

diff --git a/drivers/input/keyboard/hilkbd.c b/drivers/input/keyboard/hilkbd.c
index c1a4d5055de6..c8d8d0ea35b0 100644
--- a/drivers/input/keyboard/hilkbd.c
+++ b/drivers/input/keyboard/hilkbd.c
@@ -180,9 +180,8 @@ static irqreturn_t hil_interrupt(int irq, void *handle)
 /* send a command to the HIL */
 static void hil_do(unsigned char cmd, unsigned char *data, unsigned int len)
 {
-	unsigned long flags;
+	guard(spinlock_irqsave)(&hil_dev.lock);
 
-	spin_lock_irqsave(&hil_dev.lock, flags);
 	while (hil_busy())
 		/* wait */;
 	hil_command(cmd);
@@ -191,7 +190,6 @@ static void hil_do(unsigned char cmd, unsigned char *data, unsigned int len)
 			/* wait */;
 		hil_write_data(*(data++));
 	}
-	spin_unlock_irqrestore(&hil_dev.lock, flags);
 }
 
 
-- 
2.47.0.163.g1226f6d8fa-goog


-- 
Dmitry