From: Ishizaki Kou <kou.ishizaki@toshiba.co.jp>
Date: Fri, 12 Jan 2007 00:52:41 +0000 (+0900)
Subject: [POWERPC] spufs: Add SPU register lock
X-Git-Tag: v2.6.21-rc1~92^2~23^2~97
X-Git-Url: https://err.no/cgi-bin/gitweb.cgi?a=commitdiff_plain;h=3650cfe2e51432030e469afd75a429c199c4e42f;p=linux-2.6

[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>
---

diff --git a/arch/powerpc/platforms/cell/spu_base.c b/arch/powerpc/platforms/cell/spu_base.c
index bd7bffc3dd..c43999a10d 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;
 }