1 files changed, 1 insertions, 1 deletions

diff --git a/arch/powerpc/platforms/cell/spufs/file.c b/arch/powerpc/platforms/cell/spufs/file.c
index 5b8ba6c3aa3c..0ea2361865a2 100644
--- a/arch/powerpc/platforms/cell/spufs/file.c
+++ b/arch/powerpc/platforms/cell/spufs/file.c
@@ -385,7 +385,7 @@ static ssize_t spufs_mbox_read(struct file *file, char __user *buf,
         udata = (void __user *)buf;
 
         spu_acquire(ctx);
-        for (count = 0; count <= len; count += 4, udata++) {
+        for (count = 0; (count + 4) <= len; count += 4, udata++) {
                 int ret;
                 ret = ctx->ops->mbox_read(ctx, &mbox_data);
                 if (ret == 0)