[PATCH] MIPS: unsigned result is always greater than 0

[Roel Kluin <roel.kluin@gmail.com>]

unsigned result is always greater than 0

Signed-off-by: Roel Kluin <roel.kluin@gmail.com>
---
I cannot determine whether the same bug occurs as well in assembly.
Also shouldn't similar checks occur in atomic64_sub_return and in
atomic64_add_return for negative values of i?

diff --git a/arch/mips/include/asm/atomic.h b/arch/mips/include/asm/atomic.h
index 1232be3..3cd07a9 100644
--- a/arch/mips/include/asm/atomic.h
+++ b/arch/mips/include/asm/atomic.h
@@ -296,9 +296,10 @@ static __inline__ int atomic_sub_if_positive(int i, atomic_t * v)
 
 		raw_local_irq_save(flags);
 		result = v->counter;
-		result -= i;
-		if (result >= 0)
+		if (i <= result) {
+			result -= i;
 			v->counter = result;
+		}
 		raw_local_irq_restore(flags);
 	}
 
@@ -677,9 +678,10 @@ static __inline__ long atomic64_sub_if_positive(long i, atomic64_t * v)
 
 		raw_local_irq_save(flags);
 		result = v->counter;
-		result -= i;
-		if (result >= 0)
+		if (i >= result) {
+			result -= i;
 			v->counter = result;
+		}
 		raw_local_irq_restore(flags);
 	}