[PATCH net-next v2 0/2] net: bcmgenet: fix aborted suspend

[PATCH net-next v2 0/2] net: bcmgenet: fix aborted suspend

[Doug Berger]

It is not enough to return an error code from the driver suspend
routine. The driver must also restore the device functionality.

This commit corrects the issue introduced by commit 0db55093b566 
("net: bcmgenet: return correct value 'ret' from bcmgenet_power_down")
by calling the driver resume function if the suspend function returns
an error.

Changes in v2:
- Removed accidentally included write to HFB register

Doug Berger (2):
  net: bcmgenet: code movement
  net: bcmgenet: abort suspend on error

 drivers/net/ethernet/broadcom/genet/bcmgenet.c     | 63 +++++++++++-----------
 drivers/net/ethernet/broadcom/genet/bcmgenet_wol.c |  2 +
 2 files changed, 35 insertions(+), 30 deletions(-)

-- 
2.7.4

[PATCH net-next v2 1/2] net: bcmgenet: code movement

[Doug Berger]

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

This commit switches the order of bcmgenet_suspend and bcmgenet_resume
in the file to prevent the need for a forward declaration in the next
commit and to make the review of that commit easier.

Signed-off-by: Doug Berger <doug.berger@broadcom.com>
---
 drivers/net/ethernet/broadcom/genet/bcmgenet.c | 60 +++++++++++++-------------
 1 file changed, 30 insertions(+), 30 deletions(-)

diff --git a/drivers/net/ethernet/broadcom/genet/bcmgenet.c b/drivers/net/ethernet/broadcom/genet/bcmgenet.c
index bf88749505a9..01c8499fd87f 100644
--- a/drivers/net/ethernet/broadcom/genet/bcmgenet.c
+++ b/drivers/net/ethernet/broadcom/genet/bcmgenet.c
@@ -3612,36 +3612,6 @@ static int bcmgenet_remove(struct platform_device *pdev)
 }
 
 #ifdef CONFIG_PM_SLEEP
-static int bcmgenet_suspend(struct device *d)
-{
-	struct net_device *dev = dev_get_drvdata(d);
-	struct bcmgenet_priv *priv = netdev_priv(dev);
-	int ret = 0;
-
-	if (!netif_running(dev))
-		return 0;
-
-	netif_device_detach(dev);
-
-	bcmgenet_netif_stop(dev);
-
-	if (!device_may_wakeup(d))
-		phy_suspend(dev->phydev);
-
-	/* Prepare the device for Wake-on-LAN and switch to the slow clock */
-	if (device_may_wakeup(d) && priv->wolopts) {
-		ret = bcmgenet_power_down(priv, GENET_POWER_WOL_MAGIC);
-		clk_prepare_enable(priv->clk_wol);
-	} else if (priv->internal_phy) {
-		ret = bcmgenet_power_down(priv, GENET_POWER_PASSIVE);
-	}
-
-	/* Turn off the clocks */
-	clk_disable_unprepare(priv->clk);
-
-	return ret;
-}
-
 static int bcmgenet_resume(struct device *d)
 {
 	struct net_device *dev = dev_get_drvdata(d);
@@ -3719,6 +3689,36 @@ static int bcmgenet_resume(struct device *d)
 	clk_disable_unprepare(priv->clk);
 	return ret;
 }
+
+static int bcmgenet_suspend(struct device *d)
+{
+	struct net_device *dev = dev_get_drvdata(d);
+	struct bcmgenet_priv *priv = netdev_priv(dev);
+	int ret = 0;
+
+	if (!netif_running(dev))
+		return 0;
+
+	netif_device_detach(dev);
+
+	bcmgenet_netif_stop(dev);
+
+	if (!device_may_wakeup(d))
+		phy_suspend(dev->phydev);
+
+	/* Prepare the device for Wake-on-LAN and switch to the slow clock */
+	if (device_may_wakeup(d) && priv->wolopts) {
+		ret = bcmgenet_power_down(priv, GENET_POWER_WOL_MAGIC);
+		clk_prepare_enable(priv->clk_wol);
+	} else if (priv->internal_phy) {
+		ret = bcmgenet_power_down(priv, GENET_POWER_PASSIVE);
+	}
+
+	/* Turn off the clocks */
+	clk_disable_unprepare(priv->clk);
+
+	return ret;
+}
 #endif /* CONFIG_PM_SLEEP */
 
 static SIMPLE_DEV_PM_OPS(bcmgenet_pm_ops, bcmgenet_suspend, bcmgenet_resume);
-- 
2.7.4

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

[Doug Berger]

From: Doug Berger <doug.berger@broadcom.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@broadcom.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

Re: [PATCH net-next v2 0/2] net: bcmgenet: fix aborted suspend

[David Miller]

From: Doug Berger <opendmb@gmail.com>
Date: Mon, 19 Nov 2018 09:56:00 -0800

> It is not enough to return an error code from the driver suspend
> routine. The driver must also restore the device functionality.
> 
> This commit corrects the issue introduced by commit 0db55093b566 
> ("net: bcmgenet: return correct value 'ret' from bcmgenet_power_down")
> by calling the driver resume function if the suspend function returns
> an error.
> 
> Changes in v2:
> - Removed accidentally included write to HFB register

Doug, this doesn't apply cleanly to net-next.