release/5.2.40/e1000e-Use-rtnl_lock-to-prevent-race-conditions-betw.patch

From 20d52f91ba958d221c17a8ff175ea1e3e922a5ee Mon Sep 17 00:00:00 2001
From: Alexander Duyck <alexander.h.duyck@linux.intel.com>
Date: Fri, 11 Oct 2019 08:34:52 -0700
Subject: [PATCH] e1000e: Use rtnl_lock to prevent race conditions between net
 and pci/pm

commit a7023819404ac9bd2bb311a4fafd38515cfa71ec upstream.

This patch is meant to address possible race conditions that can exist
between network configuration and power management. A similar issue was
fixed for igb in commit 9474933caf21 ("igb: close/suspend race in
netif_device_detach").

In addition it consolidates the code so that the PCI error handling code
will essentially perform the power management freeze on the device prior to
attempting a reset, and will thaw the device afterwards if that is what it
is planning to do. Otherwise when we call close on the interface it should
see it is detached and not attempt to call the logic to down the interface
and free the IRQs again.

From what I can tell the check that was adding the check for __E1000_DOWN
in e1000e_close was added when runtime power management was added. However
it should not be relevant for us as we perform a call to
pm_runtime_get_sync before we call e1000_down/free_irq so it should always
be back up before we call into this anyway.

Reported-by: Morumuri Srivalli <smorumu1@in.ibm.com>
Signed-off-by: Alexander Duyck <alexander.h.duyck@linux.intel.com>
Tested-by: David Dai <zdai@linux.vnet.ibm.com>
Tested-by: Aaron Brown <aaron.f.brown@intel.com>
Signed-off-by: Paul Gortmaker <paul.gortmaker@windriver.com>

diff --git a/drivers/net/ethernet/intel/e1000e/netdev.c b/drivers/net/ethernet/intel/e1000e/netdev.c
index 2a61c79cf467..91580fb2f198 100644
--- a/drivers/net/ethernet/intel/e1000e/netdev.c
+++ b/drivers/net/ethernet/intel/e1000e/netdev.c
@@ -4713,12 +4713,12 @@ int e1000e_close(struct net_device *netdev)
 
 	pm_runtime_get_sync(&pdev->dev);
 
-	if (!test_bit(__E1000_DOWN, &adapter->state)) {
+	if (netif_device_present(netdev)) {
 		e1000e_down(adapter, true);
 		e1000_free_irq(adapter);
 
 		/* Link status message must follow this format */
-		pr_info("%s NIC Link is Down\n", adapter->netdev->name);
+		pr_info("%s NIC Link is Down\n", netdev->name);
 	}
 
 	napi_disable(&adapter->napi);
@@ -6294,10 +6294,14 @@ static int e1000e_pm_freeze(struct device *dev)
 {
 	struct net_device *netdev = dev_get_drvdata(dev);
 	struct e1000_adapter *adapter = netdev_priv(netdev);
+	bool present;
 
+	rtnl_lock();
+
+	present = netif_device_present(netdev);
 	netif_device_detach(netdev);
 
-	if (netif_running(netdev)) {
+	if (present && netif_running(netdev)) {
 		int count = E1000_CHECK_RESET_COUNT;
 
 		while (test_bit(__E1000_RESETTING, &adapter->state) && count--)
@@ -6309,6 +6313,8 @@ static int e1000e_pm_freeze(struct device *dev)
 		e1000e_down(adapter, false);
 		e1000_free_irq(adapter);
 	}
+	rtnl_unlock();
+
 	e1000e_reset_interrupt_capability(adapter);
 
 	/* Allow time for pending master requests to run */
@@ -6556,6 +6562,30 @@ static void e1000e_disable_aspm_locked(struct pci_dev *pdev, u16 state)
 	__e1000e_disable_aspm(pdev, state, 1);
 }
 
+static int e1000e_pm_thaw(struct device *dev)
+{
+	struct net_device *netdev = dev_get_drvdata(dev);
+	struct e1000_adapter *adapter = netdev_priv(netdev);
+	int rc = 0;
+
+	e1000e_set_interrupt_capability(adapter);
+
+	rtnl_lock();
+	if (netif_running(netdev)) {
+		rc = e1000_request_irq(adapter);
+		if (rc)
+			goto err_irq;
+
+		e1000e_up(adapter);
+	}
+
+	netif_device_attach(netdev);
+err_irq:
+	rtnl_unlock();
+
+	return rc;
+}
+
 #ifdef CONFIG_PM
 static int __e1000_resume(struct pci_dev *pdev)
 {
@@ -6623,26 +6653,6 @@ static int __e1000_resume(struct pci_dev *pdev)
 }
 
 #ifdef CONFIG_PM_SLEEP
-static int e1000e_pm_thaw(struct device *dev)
-{
-	struct net_device *netdev = dev_get_drvdata(dev);
-	struct e1000_adapter *adapter = netdev_priv(netdev);
-
-	e1000e_set_interrupt_capability(adapter);
-	if (netif_running(netdev)) {
-		u32 err = e1000_request_irq(adapter);
-
-		if (err)
-			return err;
-
-		e1000e_up(adapter);
-	}
-
-	netif_device_attach(netdev);
-
-	return 0;
-}
-
 static int e1000e_pm_suspend(struct device *dev)
 {
 	struct pci_dev *pdev = to_pci_dev(dev);
@@ -6814,16 +6824,11 @@ static void e1000_netpoll(struct net_device *netdev)
 static pci_ers_result_t e1000_io_error_detected(struct pci_dev *pdev,
 						pci_channel_state_t state)
 {
-	struct net_device *netdev = pci_get_drvdata(pdev);
-	struct e1000_adapter *adapter = netdev_priv(netdev);
-
-	netif_device_detach(netdev);
+	e1000e_pm_freeze(&pdev->dev);
 
 	if (state == pci_channel_io_perm_failure)
 		return PCI_ERS_RESULT_DISCONNECT;
 
-	if (netif_running(netdev))
-		e1000e_down(adapter, true);
 	pci_disable_device(pdev);
 
 	/* Request a slot slot reset. */
@@ -6889,10 +6894,7 @@ static void e1000_io_resume(struct pci_dev *pdev)
 
 	e1000_init_manageability_pt(adapter);
 
-	if (netif_running(netdev))
-		e1000e_up(adapter);
-
-	netif_device_attach(netdev);
+	e1000e_pm_thaw(&pdev->dev);
 
 	/* If the controller has AMT, do not set DRV_LOAD until the interface
 	 * is up.  For all other cases, let the f/w know that the h/w is now
-- 
2.7.4