powerpc: Fix bug in move of altivec code to vector.S

The patch that moved to vector.S and made common between 32 and 64-bit the
altivec code had a nasty bug on 32-bit (did I really test that ?) which
causes the kernel to blr back into userspace ... oops :-)

Signed-off-by: Benjamin Herrenschmidt <benh@kernel.crashing.org>

1 files changed, 4 insertions, 2 deletions

diff --git a/arch/powerpc/kernel/head_32.S b/arch/powerpc/kernel/head_32.S
index 6437f905c566..48469463f89e 100644
--- a/arch/powerpc/kernel/head_32.S
+++ b/arch/powerpc/kernel/head_32.S
@@ -733,9 +733,11 @@ END_MMU_FTR_SECTION_IFSET(MMU_FTR_NEED_DTLB_SW_LRU)
 AltiVecUnavailable:
         EXCEPTION_PROLOG
 #ifdef CONFIG_ALTIVEC
-        bne     load_up_altivec         /* if from user, just load it up */
+        beq     1f
+        bl      load_up_altivec         /* if from user, just load it up */
+        b       fast_exception_return
 #endif /* CONFIG_ALTIVEC */
-        addi    r3,r1,STACK_FRAME_OVERHEAD
+1:      addi    r3,r1,STACK_FRAME_OVERHEAD
         EXC_XFER_EE_LITE(0xf20, altivec_unavailable_exception)
 
 PerformanceMonitor: