From: Heiner Kallweit <hkallweit1@gmail.com>
Date: Thu, 30 Nov 2017 23:55:15 +0100
Subject: net: phy: core: remove now uneeded disabling of interrupts
Patch-mainline: v4.16-rc1
Git-commit: a6d1642dab0c49829cda61508cbdc97172815ff7
References: bsc#1119113 FATE#326472

After commits c974bdbc3e "net: phy: Use threaded IRQ, to allow IRQ from
sleeping devices" and 664fcf123a30 "net: phy: Threaded interrupts allow
some simplification" all relevant code pieces run in process context
anyway and I don't think we need the disabling of interrupts any longer.

Interestingly enough, latter commit already removed the comment
explaining why interrupts need to be temporarily disabled.

On my system phy interrupt mode works fine with this patch.
However I may miss something, especially in the context of shared phy
interrupts, therefore I'd appreciate if more people could test this.

Signed-off-by: Heiner Kallweit <hkallweit1@gmail.com>
Acked-by: Ard Biesheuvel <ard.biesheuvel@linaro.org>
Signed-off-by: David S. Miller <davem@davemloft.net>
Acked-by: Thomas Bogendoerfer <tbogendoerfer@suse.de>
---
 drivers/net/phy/phy.c |   26 ++------------------------
 include/linux/phy.h   |    1 -
 2 files changed, 2 insertions(+), 25 deletions(-)

--- a/drivers/net/phy/phy.c
+++ b/drivers/net/phy/phy.c
@@ -632,9 +632,6 @@ static irqreturn_t phy_interrupt(int irq
 	if (PHY_HALTED == phydev->state)
 		return IRQ_NONE;		/* It can't be ours.  */
 
-	disable_irq_nosync(irq);
-	atomic_inc(&phydev->irq_disable);
-
 	phy_change(phydev);
 
 	return IRQ_HANDLED;
@@ -692,7 +689,6 @@ phy_err:
  */
 int phy_start_interrupts(struct phy_device *phydev)
 {
-	atomic_set(&phydev->irq_disable, 0);
 	if (request_threaded_irq(phydev->irq, NULL, phy_interrupt,
 				 IRQF_ONESHOT | IRQF_SHARED,
 				 phydev_name(phydev), phydev) < 0) {
@@ -719,13 +715,6 @@ int phy_stop_interrupts(struct phy_devic
 
 	free_irq(phydev->irq, phydev);
 
-	/* If work indeed has been cancelled, disable_irq() will have
-	 * been left unbalanced from phy_interrupt() and enable_irq()
-	 * has to be called so that other devices on the line work.
-	 */
-	while (atomic_dec_return(&phydev->irq_disable) >= 0)
-		enable_irq(phydev->irq);
-
 	return err;
 }
 EXPORT_SYMBOL(phy_stop_interrupts);
@@ -739,7 +728,7 @@ void phy_change(struct phy_device *phyde
 	if (phy_interrupt_is_valid(phydev)) {
 		if (phydev->drv->did_interrupt &&
 		    !phydev->drv->did_interrupt(phydev))
-			goto ignore;
+			return;
 
 		if (phy_disable_interrupts(phydev))
 			goto phy_err;
@@ -751,27 +740,16 @@ void phy_change(struct phy_device *phyde
 	mutex_unlock(&phydev->lock);
 
 	if (phy_interrupt_is_valid(phydev)) {
-		atomic_dec(&phydev->irq_disable);
-		enable_irq(phydev->irq);
-
 		/* Reenable interrupts */
 		if (PHY_HALTED != phydev->state &&
 		    phy_config_interrupt(phydev, PHY_INTERRUPT_ENABLED))
-			goto irq_enable_err;
+			goto phy_err;
 	}
 
 	/* reschedule state queue work to run as soon as possible */
 	phy_trigger_machine(phydev, true);
 	return;
 
-ignore:
-	atomic_dec(&phydev->irq_disable);
-	enable_irq(phydev->irq);
-	return;
-
-irq_enable_err:
-	disable_irq(phydev->irq);
-	atomic_inc(&phydev->irq_disable);
 phy_err:
 	phy_error(phydev);
 }
--- a/include/linux/phy.h
+++ b/include/linux/phy.h
@@ -465,7 +465,6 @@ struct phy_device {
 	/* Interrupt and Polling infrastructure */
 	struct work_struct phy_queue;
 	struct delayed_work state_queue;
-	atomic_t irq_disable;
 
 	struct mutex lock;