[PATCH 10/22] Input: ideapad_slidebar - use guard notation when acquiring spinlock

[Dmitry Torokhov]

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@xxxxxxxxx>
---
 drivers/input/misc/ideapad_slidebar.c | 22 +++++-----------------
 1 file changed, 5 insertions(+), 17 deletions(-)

diff --git a/drivers/input/misc/ideapad_slidebar.c b/drivers/input/misc/ideapad_slidebar.c
index fa4e7f67d713..592bd159a194 100644
--- a/drivers/input/misc/ideapad_slidebar.c
+++ b/drivers/input/misc/ideapad_slidebar.c
@@ -95,41 +95,29 @@ static struct platform_device *slidebar_platform_dev;
 
 static u8 slidebar_pos_get(void)
 {
-	u8 res;
-	unsigned long flags;
+	guard(spinlock_irqsave)(&io_lock);
 
-	spin_lock_irqsave(&io_lock, flags);
 	outb(0xf4, 0xff29);
 	outb(0xbf, 0xff2a);
-	res = inb(0xff2b);
-	spin_unlock_irqrestore(&io_lock, flags);
-
-	return res;
+	return inb(0xff2b);
 }
 
 static u8 slidebar_mode_get(void)
 {
-	u8 res;
-	unsigned long flags;
+	guard(spinlock_irqsave)(&io_lock);
 
-	spin_lock_irqsave(&io_lock, flags);
 	outb(0xf7, 0xff29);
 	outb(0x8b, 0xff2a);
-	res = inb(0xff2b);
-	spin_unlock_irqrestore(&io_lock, flags);
-
-	return res;
+	return inb(0xff2b);
 }
 
 static void slidebar_mode_set(u8 mode)
 {
-	unsigned long flags;
+	guard(spinlock_irqsave)(&io_lock);
 
-	spin_lock_irqsave(&io_lock, flags);
 	outb(0xf7, 0xff29);
 	outb(0x8b, 0xff2a);
 	outb(mode, 0xff2b);
-	spin_unlock_irqrestore(&io_lock, flags);
 }
 
 static bool slidebar_i8042_filter(unsigned char data, unsigned char str,
-- 
2.46.0.469.g59c65b2a67-goog