[POWERPC] spufs: Add SPU register lock

spu->register_lock should be held before accessing registers.

Signed-off-by: Kou Ishizaki <kou.ishizaki@toshiba.co.jp>
Acked-by: Arnd Bergmann <arnd.bergmann@de.ibm.com>
Signed-off-by: Paul Mackerras <paulus@samba.org>

1 files changed, 3 insertions, 0 deletions

diff --git a/arch/powerpc/platforms/cell/spu_base.c b/arch/powerpc/platforms/cell/spu_base.c
index bd7bffc3ddd0..c43999a10deb 100644
--- a/arch/powerpc/platforms/cell/spu_base.c
+++ b/arch/powerpc/platforms/cell/spu_base.c
@@ -170,9 +170,11 @@ int
 spu_irq_class_0_bottom(struct spu *spu)
 {
         unsigned long stat, mask;
+        unsigned long flags;
 
         spu->class_0_pending = 0;
 
+        spin_lock_irqsave(&spu->register_lock, flags);
         mask = spu_int_mask_get(spu, 0);
         stat = spu_int_stat_get(spu, 0);
 
@@ -188,6 +190,7 @@ spu_irq_class_0_bottom(struct spu *spu)
                 __spu_trap_error(spu);
 
         spu_int_stat_clear(spu, 0, stat);
+        spin_unlock_irqrestore(&spu->register_lock, flags);
 
         return (stat & 0x7) ? -EIO : 0;
 }