linux-kernel - [PATCH net-next v2 2/2] net: bcmgenet: abort suspend on error

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Message-Id: <1542650162-9229-3-git-send-email-opendmb@gmail.com>
Date:   Mon, 19 Nov 2018 09:56:02 -0800
From:   Doug Berger <opendmb@...il.com>
To:     "David S. Miller" <davem@...emloft.net>
Cc:     Florian Fainelli <f.fainelli@...il.com>, netdev@...r.kernel.org,
        linux-kernel@...r.kernel.org, YueHaibing <yuehaibing@...wei.com>,
        Doug Berger <doug.berger@...adcom.com>
Subject: [PATCH net-next v2 2/2] net: bcmgenet: abort suspend on error

From: Doug Berger <doug.berger@...adcom.com>

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: 0db55093b566 ("net: bcmgenet: return correct value 'ret' from bcmgenet_power_down")
Signed-off-by: Doug Berger <doug.berger@...adcom.com>
---
 drivers/net/ethernet/broadcom/genet/bcmgenet.c     | 3 +++
 drivers/net/ethernet/broadcom/genet/bcmgenet_wol.c | 2 ++
 2 files changed, 5 insertions(+)

diff --git a/drivers/net/ethernet/broadcom/genet/bcmgenet.c b/drivers/net/ethernet/broadcom/genet/bcmgenet.c
index 01c8499fd87f..983245c0867c 100644
--- a/drivers/net/ethernet/broadcom/genet/bcmgenet.c
+++ b/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 */
diff --git a/drivers/net/ethernet/broadcom/genet/bcmgenet_wol.c b/drivers/net/ethernet/broadcom/genet/bcmgenet_wol.c
index 2fbd027f0148..57582efa362d 100644
--- a/drivers/net/ethernet/broadcom/genet/bcmgenet_wol.c
+++ b/drivers/net/ethernet/broadcom/genet/bcmgenet_wol.c
@@ -186,6 +186,8 @@ 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);
 
-- 
2.7.4