net: bcmgenet: abort suspend on error

If an error occurs during suspension of the driver the driver should
restore the hardware configuration and return an error to force the
system to resume.

Fixes: 0db5509 ("net: bcmgenet: return correct value 'ret' from bcmgenet_power_down")
Signed-off-by: Doug Berger <opendmb@gmail.com>
Reviewed-by: Florian Fainelli <f.fainelli@gmail.com>
Signed-off-by: David S. Miller <davem@davemloft.net>

drivers/net/ethernet/broadcom/genet/bcmgenet.c

@@ -3717,6 +3717,9 @@ static int bcmgenet_suspend(struct device *d)
 	/* Turn off the clocks */
 	clk_disable_unprepare(priv->clk);
 
+	if (ret)
+		bcmgenet_resume(d);
+
 	return ret;
 }
 #endif /* CONFIG_PM_SLEEP */

drivers/net/ethernet/broadcom/genet/bcmgenet_wol.c

@@ -186,9 +186,15 @@ void bcmgenet_wol_power_up_cfg(struct bcmgenet_priv *priv,
 	}
 
 	reg = bcmgenet_umac_readl(priv, UMAC_MPD_CTRL);
+	if (!(reg & MPD_EN))
+		return;	/* already powered up so skip the rest */
 	reg &= ~MPD_EN;
 	bcmgenet_umac_writel(priv, reg, UMAC_MPD_CTRL);
 
+	reg = bcmgenet_hfb_reg_readl(priv, HFB_CTRL);
+	reg &= ~(RBUF_HFB_EN | RBUF_ACPI_EN);
+	bcmgenet_hfb_reg_writel(priv, reg, HFB_CTRL);
+
 	/* Disable CRC Forward */
 	reg = bcmgenet_umac_readl(priv, UMAC_CMD);
 	reg &= ~CMD_CRC_FWD;