arcfb: use fb_sys_read()

Since arcfb's framebuffer is vmalloc'ed, use the fb_sys_read().

Signed-off-by: Antonino Daplas <adaplas@gmail.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
diff --git a/drivers/video/arcfb.c b/drivers/video/arcfb.c
index c668e56..db15bac 100644
--- a/drivers/video/arcfb.c
+++ b/drivers/video/arcfb.c
@@ -494,6 +494,7 @@
 static struct fb_ops arcfb_ops = {
 	.owner		= THIS_MODULE,
 	.fb_open	= arcfb_open,
+	.fb_read        = fb_sys_read,
 	.fb_write	= arcfb_write,
 	.fb_release	= arcfb_release,
 	.fb_pan_display	= arcfb_pan_display,