netdev - [RFT][PATCH 2/3] NET/e1000e: Fix powering off during shutdown

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Date:	Sat, 4 Apr 2009 23:40:43 +0200
From:	"Rafael J. Wysocki" <rjw@...k.pl>
To:	NetDev <netdev@...r.kernel.org>
Cc:	Jesse Brandeburg <jesse.brandeburg@...il.com>,
	Jeff Kirsher <jeffrey.t.kirsher@...el.com>,
	Yinghai Lu <yinghai@...nel.org>,
	pm list <linux-pm@...ts.linux-foundation.org>,
	LKML <linux-kernel@...r.kernel.org>
Subject: [RFT][PATCH 2/3] NET/e1000e: Fix powering off during shutdown

From: Rafael J. Wysocki <rjw@...k.pl>

Impact: Fix

Prevent e1000e from putting the adapter into D3 during shutdown
except when we're going to power off the system, since doing that may
generally cause problems with kexec to happen (such problems were
observed for igb and forcedeth).  For this purpose seperate
e1000e_shutdown() from e1000e_suspend() and use the appropriate PCI
PM callbacks in both of them.

Signed-off-by: Rafael J. Wysocki <rjw@...k.pl>
---
 drivers/net/e1000e/netdev.c |   58 +++++++++++++++++++++++++++++++++-----------
 1 file changed, 44 insertions(+), 14 deletions(-)

Index: linux-2.6/drivers/net/e1000e/netdev.c
===================================================================
--- linux-2.6.orig/drivers/net/e1000e/netdev.c
+++ linux-2.6/drivers/net/e1000e/netdev.c
@@ -4346,7 +4346,7 @@ static int e1000_ioctl(struct net_device
 	}
 }
 
-static int e1000_suspend(struct pci_dev *pdev, pm_message_t state)
+static int __e1000_shutdown(struct pci_dev *pdev, bool *enable_wake)
 {
 	struct net_device *netdev = pci_get_drvdata(pdev);
 	struct e1000_adapter *adapter = netdev_priv(netdev);
@@ -4409,20 +4409,16 @@ static int e1000_suspend(struct pci_dev 
 
 		ew32(WUC, E1000_WUC_PME_EN);
 		ew32(WUFC, wufc);
-		pci_enable_wake(pdev, PCI_D3hot, 1);
-		pci_enable_wake(pdev, PCI_D3cold, 1);
 	} else {
 		ew32(WUC, 0);
 		ew32(WUFC, 0);
-		pci_enable_wake(pdev, PCI_D3hot, 0);
-		pci_enable_wake(pdev, PCI_D3cold, 0);
 	}
 
+	*enable_wake = !!wufc;
+
 	/* make sure adapter isn't asleep if manageability is enabled */
-	if (adapter->flags & FLAG_MNG_PT_ENABLED) {
-		pci_enable_wake(pdev, PCI_D3hot, 1);
-		pci_enable_wake(pdev, PCI_D3cold, 1);
-	}
+	if (adapter->flags & FLAG_MNG_PT_ENABLED)
+		*enable_wake = true;
 
 	if (adapter->hw.phy.type == e1000_phy_igp_3)
 		e1000e_igp3_phy_powerdown_workaround_ich8lan(&adapter->hw);
@@ -4435,6 +4431,25 @@ static int e1000_suspend(struct pci_dev 
 
 	pci_disable_device(pdev);
 
+	return 0;
+}
+
+static void e1000_power_off(struct pci_dev *pdev, bool sleep, bool wake)
+{
+	if (sleep && wake) {
+		pci_prepare_to_sleep(pdev);
+		return;
+	}
+
+	pci_wake_from_d3(pdev, wake);
+	pci_set_power_state(pdev, PCI_D3hot);
+}
+
+static void e1000_complete_shutdown(struct pci_dev *pdev, bool sleep, bool wake)
+{
+	struct net_device *netdev = pci_get_drvdata(pdev);
+	struct e1000_adapter *adapter = netdev_priv(netdev);
+
 	/*
 	 * The pci-e switch on some quad port adapters will report a
 	 * correctable error when the MAC transitions from D0 to D3.  To
@@ -4450,14 +4465,12 @@ static int e1000_suspend(struct pci_dev 
 		pci_write_config_word(us_dev, pos + PCI_EXP_DEVCTL,
 		                      (devctl & ~PCI_EXP_DEVCTL_CERE));
 
-		pci_set_power_state(pdev, pci_choose_state(pdev, state));
+		e1000_power_off(pdev, sleep, wake);
 
 		pci_write_config_word(us_dev, pos + PCI_EXP_DEVCTL, devctl);
 	} else {
-		pci_set_power_state(pdev, pci_choose_state(pdev, state));
+		e1000_power_off(pdev, sleep, wake);
 	}
-
-	return 0;
 }
 
 static void e1000e_disable_l1aspm(struct pci_dev *pdev)
@@ -4486,6 +4499,18 @@ static void e1000e_disable_l1aspm(struct
 }
 
 #ifdef CONFIG_PM
+static int e1000_suspend(struct pci_dev *pdev, pm_message_t state)
+{
+	int retval;
+	bool wake;
+
+	retval = __e1000_shutdown(pdev, &wake);
+	if (!retval)
+		e1000_complete_shutdown(pdev, true, wake);
+
+	return retval;
+}
+
 static int e1000_resume(struct pci_dev *pdev)
 {
 	struct net_device *netdev = pci_get_drvdata(pdev);
@@ -4549,7 +4574,12 @@ static int e1000_resume(struct pci_dev *
 
 static void e1000_shutdown(struct pci_dev *pdev)
 {
-	e1000_suspend(pdev, PMSG_SUSPEND);
+	bool wake;
+
+	__e1000_shutdown(pdev, &wake);
+
+	if (system_state == SYSTEM_POWER_OFF)
+		e1000_complete_shutdown(pdev, false, wake);
 }
 
 #ifdef CONFIG_NET_POLL_CONTROLLER
--
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