rk fb: do something when user set invalid config

Signed-off-by: hjc <hjc@rock-chips.com>

diff --git a/drivers/video/rockchip/rk_fb.c b/drivers/video/rockchip/rk_fb.c
index b663a6ea5a9643d6436efe204e7cfd5cf5551af1..1ff46f27d4ba1e3df3e424499a0b17752926d20d 100755 (executable)
--- a/drivers/video/rockchip/rk_fb.c
+++ b/drivers/video/rockchip/rk_fb.c
@@ -2218,6 +2218,9 @@ static int rk_fb_set_win_config(struct fb_info *info,
                }
        }
 
+       if (regs->win_num <= 0)
+               goto err_null_frame;
+
        mutex_lock(&dev_drv->output_lock);
 
        dev_drv->timeline_max++;
@@ -2288,6 +2291,13 @@ static int rk_fb_set_win_config(struct fb_info *info,
 err:
        mutex_unlock(&dev_drv->output_lock);
        return ret;
+err_null_frame:
+       kfree(regs);
+       for (j = 0; j < RK_MAX_BUF_NUM; j++)
+               win_data->rel_fence_fd[j] = -1;
+       win_data->ret_fence_fd = -1;
+       pr_info("win num = %d,null frame\n", regs->win_num);
+       return 0;
 }
 
 #if 1