Input: serport - 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.

Link: https://lore.kernel.org/r/20240905041732.2034348-19-dmitry.torokhov@gmail.com
Signed-off-by: Dmitry Torokhov <dmitry.torokhov@gmail.com>

diff --git a/drivers/input/serio/serport.c b/drivers/input/serio/serport.c
index 5a2b540..74ac887 100644 (file)
--- a/drivers/input/serio/serport.c
+++ b/drivers/input/serio/serport.c
@@ -50,11 +50,9 @@ static int serport_serio_write(struct serio *serio, unsigned char data)
 static int serport_serio_open(struct serio *serio)
 {
        struct serport *serport = serio->port_data;
-       unsigned long flags;
 
-       spin_lock_irqsave(&serport->lock, flags);
+       guard(spinlock_irqsave)(&serport->lock);
        set_bit(SERPORT_ACTIVE, &serport->flags);
-       spin_unlock_irqrestore(&serport->lock, flags);
 
        return 0;
 }
@@ -63,11 +61,9 @@ static int serport_serio_open(struct serio *serio)
 static void serport_serio_close(struct serio *serio)
 {
        struct serport *serport = serio->port_data;
-       unsigned long flags;
 
-       spin_lock_irqsave(&serport->lock, flags);
+       guard(spinlock_irqsave)(&serport->lock);
        clear_bit(SERPORT_ACTIVE, &serport->flags);
-       spin_unlock_irqrestore(&serport->lock, flags);
 }
 
 /*
@@ -118,14 +114,13 @@ static void serport_ldisc_receive(struct tty_struct *tty, const u8 *cp,
                                  const u8 *fp, size_t count)
 {
        struct serport *serport = tty->disc_data;
-       unsigned long flags;
        unsigned int ch_flags = 0;
        int i;
 
-       spin_lock_irqsave(&serport->lock, flags);
+       guard(spinlock_irqsave)(&serport->lock);
 
        if (!test_bit(SERPORT_ACTIVE, &serport->flags))
-               goto out;
+               return;
 
        for (i = 0; i < count; i++) {
                if (fp) {
@@ -146,9 +141,6 @@ static void serport_ldisc_receive(struct tty_struct *tty, const u8 *cp,
 
                serio_interrupt(serport->serio, cp[i], ch_flags);
        }
-
-out:
-       spin_unlock_irqrestore(&serport->lock, flags);
 }
 
 /*
@@ -246,11 +238,9 @@ static int serport_ldisc_compat_ioctl(struct tty_struct *tty,
 static void serport_ldisc_hangup(struct tty_struct *tty)
 {
        struct serport *serport = tty->disc_data;
-       unsigned long flags;
 
-       spin_lock_irqsave(&serport->lock, flags);
-       set_bit(SERPORT_DEAD, &serport->flags);
-       spin_unlock_irqrestore(&serport->lock, flags);
+       scoped_guard(spinlock_irqsave, &serport->lock)
+               set_bit(SERPORT_DEAD, &serport->flags);
 
        wake_up_interruptible(&serport->wait);
 }
@@ -258,12 +248,11 @@ static void serport_ldisc_hangup(struct tty_struct *tty)
 static void serport_ldisc_write_wakeup(struct tty_struct * tty)
 {
        struct serport *serport = tty->disc_data;
-       unsigned long flags;
 
-       spin_lock_irqsave(&serport->lock, flags);
+       guard(spinlock_irqsave)(&serport->lock);
+
        if (test_bit(SERPORT_ACTIVE, &serport->flags))
                serio_drv_write_wakeup(serport->serio);
-       spin_unlock_irqrestore(&serport->lock, flags);
 }
 
 /*