OpenWrt – Rev 4

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--- a/drivers/net/ethernet/mediatek/mtk_eth_soc.c
+++ b/drivers/net/ethernet/mediatek/mtk_eth_soc.c
@@ -76,7 +76,10 @@ static int mtk_mdio_busy_wait(struct mtk
                        return 0;
                if (time_after(jiffies, t_start + PHY_IAC_TIMEOUT))
                        break;
-               usleep_range(10, 20);
+               if (in_atomic())
+                       udelay(10);
+               else
+                       usleep_range(10, 20);
        }
 
        dev_err(eth->dev, "mdio: MDIO timeout\n");