Add atomic_inc_not_zero() and atomic_dec_if_positive() wrappers

Signed-off-by: Takashi Iwai <tiwai@suse.de>

1 files changed, 12 insertions, 0 deletions

diff --git a/include/linux/atomic.h b/include/linux/atomic.h
index cffeb6a..4f84649 100644
--- a/include/linux/atomic.h
+++ b/include/linux/atomic.h
@@ -13,6 +13,18 @@ typedef struct {
 #define atomic_inc_return(v)	atomic_add_return(1, v)
 #define atomic_dec_return(v)	atomic_sub_return(1, v)
 #define atomic_set(v, i) (((v)->counter) = (i))
+static inline int atomic_inc_not_zero(atomic_t *v)
+{
+	if (v->counter)
+		v->counter++;
+	return v->counter;
+}
+static inline int atomic_dec_if_positive(atomic_t *v)
+{
+	if (!v->counter)
+		return -1;
+	return --v->counter;
+}
 #define ATOMIC_INIT(i)	{ (i) }
 
 #endif /* _LINUX_ATOMIC_H */