ddr_freq: fix Division by zero in kernel

diff --git a/arch/arm/mach-rockchip/ddr_freq.c b/arch/arm/mach-rockchip/ddr_freq.c
index a68c703b68074154556d012f654be2ac571adba9..2cf82297e646a38b4351a3baf28ae54ab8d0b641 100644 (file)
--- a/arch/arm/mach-rockchip/ddr_freq.c
+++ b/arch/arm/mach-rockchip/ddr_freq.c
@@ -282,6 +282,8 @@ void ddr_bandwidth_get(struct ddr_bw_info *ddr_bw_ch0, struct ddr_bw_info *ddr_b
                        ddr_bw_val[j][i] = grf_readl(RK3288_GRF_SOC_STATUS11+i*4+j*16);
                }
        }
+       if (!ddr_bw_val[0][ddrbw_time_num])
+               goto end;
 
        if (ddr_bw_ch0) {
                ddr_freq = readl_relaxed(RK_DDR_VIRT + 0xc0);
@@ -320,7 +322,7 @@ void ddr_bandwidth_get(struct ddr_bw_info *ddr_bw_ch0, struct ddr_bw_info *ddr_b
                ddr_bw_ch0->vio1 = ddr_bw_ch0->vio1*ddr_freq/ddr_bw_val[0][ddrbw_time_num];
                ddr_bw_ch0->vio2 = ddr_bw_ch0->vio2*ddr_freq/ddr_bw_val[0][ddrbw_time_num];
        }
-       
+end:
        ddr_monitor_start();
 }