qcacmn: Add an API to decrement an atomic variable if it is positive

Add an API to decrement an atomic variable if its value is positive.

CRs-Fixed: 3408572
Change-Id: I9649f1093850452a38acae6fa48e663a4e6d9c68

qdf/linux/src/i_qdf_atomic.h

@@ -149,6 +149,18 @@ static inline int32_t __qdf_atomic_dec_return(__qdf_atomic_t *v)
 	return atomic_dec_return(v);
 }
 
+/**
+ * __qdf_atomic_dec_if_positive() - Decrement an atomic variable if its
+ * value is positive
+ * @v: A pointer to an opaque atomic variable
+ *
+ * Return: The old value of the variable minus 1
+ */
+static inline int32_t __qdf_atomic_dec_if_positive(__qdf_atomic_t *v)
+{
+	return atomic_dec_if_positive(v);
+}
+
 /**
  * __qdf_atomic_inc_not_zero() - increment if not zero
  * @v: A pointer to an opaque atomic variable