netdev - [PATCH net-next resubmit 2/2] net: phy: core: don't disable device interrupts in phy

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Date:   Thu, 30 Nov 2017 23:57:00 +0100
From:   Heiner Kallweit <hkallweit1@...il.com>
To:     Florian Fainelli <f.fainelli@...il.com>,
        Andrew Lunn <andrew@...n.ch>,
        David Miller <davem@...emloft.net>
Cc:     "netdev@...r.kernel.org" <netdev@...r.kernel.org>,
        Ard Biesheuvel <ard.biesheuvel@...aro.org>
Subject: [PATCH net-next resubmit 2/2] net: phy: core: don't disable device
 interrupts in phy_change

If state is not PHY_HALTED I see no need to temporarily disable
interrupts on the device. As long as the current interrupt isn't acked
on the device no new interrupt can happen anyway.

In addition remove a unneeded enabling of interrupts in the state
machine when handling state PHY_CHANGELINK.

Tested on a Odroid-C2 with RTL8211F phy in interrupt mode.

Signed-off-by: Heiner Kallweit <hkallweit1@...il.com>
---
 drivers/net/phy/phy.c | 19 ++++++-------------
 1 file changed, 6 insertions(+), 13 deletions(-)

diff --git a/drivers/net/phy/phy.c b/drivers/net/phy/phy.c
index b3784c9a2..4a11de8cb 100644
--- a/drivers/net/phy/phy.c
+++ b/drivers/net/phy/phy.c
@@ -727,8 +727,9 @@ void phy_change(struct phy_device *phydev)
 		    !phydev->drv->did_interrupt(phydev))
 			return;
 
-		if (phy_disable_interrupts(phydev))
-			goto phy_err;
+		if (phydev->state == PHY_HALTED)
+			if (phy_disable_interrupts(phydev))
+				goto phy_err;
 	}
 
 	mutex_lock(&phydev->lock);
@@ -736,15 +737,11 @@ void phy_change(struct phy_device *phydev)
 		phydev->state = PHY_CHANGELINK;
 	mutex_unlock(&phydev->lock);
 
-	if (phy_interrupt_is_valid(phydev)) {
-		/* Reenable interrupts */
-		if (PHY_HALTED != phydev->state &&
-		    phy_config_interrupt(phydev, PHY_INTERRUPT_ENABLED))
-			goto phy_err;
-	}
-
 	/* reschedule state queue work to run as soon as possible */
 	phy_trigger_machine(phydev, true);
+
+	if (phy_interrupt_is_valid(phydev) && phy_clear_interrupt(phydev))
+		goto phy_err;
 	return;
 
 phy_err:
@@ -984,10 +981,6 @@ void phy_state_machine(struct work_struct *work)
 			phydev->state = PHY_NOLINK;
 			phy_link_down(phydev, true);
 		}
-
-		if (phy_interrupt_is_valid(phydev))
-			err = phy_config_interrupt(phydev,
-						   PHY_INTERRUPT_ENABLED);
 		break;
 	case PHY_HALTED:
 		if (phydev->link) {
-- 
2.15.0