locking, mips: Fix atomics

The patch folding the atomic ops had two silly fails in the _return
primitives.

Fixes: ef31563e ("locking,arch,mips: Fold atomic_ops")
Reported-by: Guenter Roeck <linux@roeck-us.net>
Tested-by: Guenter Roeck <linux@roeck-us.net>
Signed-off-by: Peter Zijlstra (Intel) <peterz@infradead.org>
Cc: Bart Van Assche <bvanassche@acm.org>
Cc: Hannes Reinecke <hare@suse.de>
Cc: Linus Torvalds <torvalds@linux-foundation.org>
Cc: Maciej W. Rozycki <macro@codesourcery.com>
Cc: Markos Chandras <markos.chandras@imgtec.com>
Cc: Paul Burton <paul.burton@imgtec.com>
Cc: Paul E. McKenney <paulmck@linux.vnet.ibm.com>
Cc: Ralf Baechle <ralf@linux-mips.org>
Cc: Stephen Rothwell <sfr@canb.auug.org.au>
Link: http://lkml.kernel.org/r/20140902202126.GA3190@worktop.ger.corp.intel.comSigned-off-by: Ingo Molnar <mingo@kernel.org>

arch/mips/include/asm/atomic.h

@@ -93,7 +93,7 @@ static __inline__ int atomic_##op##_return(int i, atomic_t * v)			\
 		"	" #asm_op " %0, %1, %3				\n"	\
 		"	sc	%0, %2					\n"	\
 		"	beqzl	%0, 1b					\n"	\
-		"	addu	%0, %1, %3				\n"	\
+		"	" #asm_op " %0, %1, %3				\n"	\
 		"	.set	mips0					\n"	\
 		: "=&r" (result), "=&r" (temp), "+m" (v->counter)		\
 		: "Ir" (i));							\
@@ -111,7 +111,7 @@ static __inline__ int atomic_##op##_return(int i, atomic_t * v)			\
 			: "Ir" (i));						\
 		} while (unlikely(!result));					\
 										\
-		result = temp + i;						\
+		result = temp; result c_op i;					\
 	} else {								\
 		unsigned long flags;						\
 										\
@@ -387,7 +387,7 @@ static __inline__ long atomic64_##op##_return(long i, atomic64_t * v)		\
 			: "memory");						\
 		} while (unlikely(!result));					\
 										\
-		result = temp + i;						\
+		result = temp; result c_op i;					\
 	} else {								\
 		unsigned long flags;						\
 										\