[PATCH 1/19] spufs: add SPU register lock

[Ishizaki Kou]

spu->register_lock should be held before accessing registers.

Signed-off-by: Kou Ishizaki <kou.ishizaki at toshiba.co.jp>
Acked-by: Arnd Bergmann <arnd.bergmann at de.ibm.com>
---

Index: linux-powerpc-git/arch/powerpc/platforms/cell/spu_base.c
diff -u linux-powerpc-git/arch/powerpc/platforms/cell/spu_base.c:1.1.1.1 linux-powerpc-git/arch/powerpc/platforms/cell/spu_base.c:1.2
--- linux-powerpc-git/arch/powerpc/platforms/cell/spu_base.c:1.1.1.1	Wed Dec  6 08:25:44 2006
+++ linux-powerpc-git/arch/powerpc/platforms/cell/spu_base.c	Thu Dec  7 16:24:53 2006
@@ -170,9 +170,11 @@
 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_trap_error(spu);
 
 	spu_int_stat_clear(spu, 0, stat);
+	spin_unlock_irqrestore(&spu->register_lock, flags);
 
 	return (stat & 0x7) ? -EIO : 0;
 }