[PATCH] AVR32: Fix atomic_add_unless() and atomic_sub_unless()

These functions depend on "result" being initalized to 0, but "result"
is not included as an input constraint to the inline assembly block
following its initialization, only as an output constraint. Thus gcc
thinks it doesn't need to initialize it, so result ends up undefined
if the "unless" condition is true.

This fixes an oops in sunrpc where the faulty atomics caused
rpciod_up() to not start the workqueue as it should.

Signed-off-by: Haavard Skinnemoen <hskinnemoen@atmel.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@suse.de>

diff --git a/include/asm-avr32/atomic.h b/include/asm-avr32/atomic.h
index c40b6032c48027655b972b7c0e603dc82c7eb492..7df7b75734816e788e38814eb06e0ab7a26e9143 100644 (file)
--- a/include/asm-avr32/atomic.h
+++ b/include/asm-avr32/atomic.h
@@ -101,7 +101,7 @@ static inline int atomic_sub_unless(atomic_t *v, int a, int u)
                "       mov     %1, 1\n"
                "1:"
                : "=&r"(tmp), "=&r"(result), "=o"(v->counter)
-               : "m"(v->counter), "rKs21"(a), "rKs21"(u)
+               : "m"(v->counter), "rKs21"(a), "rKs21"(u), "1"(result)
                : "cc", "memory");
 
        return result;
@@ -137,7 +137,7 @@ static inline int atomic_add_unless(atomic_t *v, int a, int u)
                        "       mov     %1, 1\n"
                        "1:"
                        : "=&r"(tmp), "=&r"(result), "=o"(v->counter)
-                       : "m"(v->counter), "r"(a), "ir"(u)
+                       : "m"(v->counter), "r"(a), "ir"(u), "1"(result)
                        : "cc", "memory");
        }