From: hjc <hjc@rock-chips.com>
Date: Tue, 15 Apr 2014 11:08:07 +0000 (+0800)
Subject: rk fb: fix first ddr freq NULL point
X-Git-Tag: firefly_0821_release~5550
X-Git-Url: http://demsky.eecs.uci.edu/git/?a=commitdiff_plain;h=d6a211dbc9038853c79eab45a5ea43b93daa9ea3;p=firefly-linux-kernel-4.4.55.git

rk fb: fix first ddr freq NULL point
---

diff --git a/drivers/video/rockchip/rk_fb.c b/drivers/video/rockchip/rk_fb.c
index 2299e2c2bc7e..e718ab4a4d7a 100755
--- a/drivers/video/rockchip/rk_fb.c
+++ b/drivers/video/rockchip/rk_fb.c
@@ -596,8 +596,10 @@ bool rk_fb_poll_wait_frame_complete(void)
 
        
 	if (rk_fb_poll_prmry_screen_vblank() == RK_LF_STATUS_NC){
-		if(dev_drv->ops->set_irq_to_cpu)
-                        dev_drv->ops->set_irq_to_cpu(dev_drv,1);		
+		if (likely(dev_drv)) {
+			if(dev_drv->ops->set_irq_to_cpu)
+	                        dev_drv->ops->set_irq_to_cpu(dev_drv,1);
+		}
 		return false;
 	}