Patch "e1000: fix disabling already-disabled warning" has been added to the 3.18-stable tree

This is a note to let you know that I've just added the patch titled

e1000: fix disabling already-disabled warning

to the 3.18-stable tree which can be found at:
http://www.kernel.org/git/?p=linux/kernel/git/stable/stable-queue.git;a=summary

The filename of the patch is:
e1000-fix-disabling-already-disabled-warning.patch
and it can be found in the queue-3.18 subdirectory.

If you, or anyone else, feels it should not be added to the stable tree, please let <[email protected]> know about it.

From: Tushar Dave <[email protected]>
Date: Wed, 6 Dec 2017 02:26:29 +0530
Subject: e1000: fix disabling already-disabled warning

From: Tushar Dave <[email protected]>

[ Upstream commit 0b76aae741abb9d16d2c0e67f8b1e766576f897d ]

This patch adds check so that driver does not disable already disabled device.

[   44.637743] advantechwdt: Unexpected close, not stopping watchdog!
[   44.997548] input: ImExPS/2 Generic Explorer Mouse as /devices/platform/i8042/serio1/input/input6
[   45.013419] e1000 0000:00:03.0: disabling already-disabled device
[   45.013447] ------------[ cut here ]------------
[   45.014868] WARNING: CPU: 1 PID: 71 at drivers/pci/pci.c:1641 pci_disable_device+0xa1/0x105:
						pci_disable_device at drivers/pci/pci.c:1640
[   45.016171] CPU: 1 PID: 71 Comm: rcu_perf_shutdo Not tainted 4.14.0-01330-g3c07399 #1
[   45.017197] task: ffff88011bee9e40 task.stack: ffffc90000860000
[   45.017987] RIP: 0010:pci_disable_device+0xa1/0x105:
						pci_disable_device at drivers/pci/pci.c:1640
[   45.018603] RSP: 0000:ffffc90000863e30 EFLAGS: 00010286
[   45.019282] RAX: 0000000000000035 RBX: ffff88013a230008 RCX: 0000000000000000
[   45.020182] RDX: 0000000000000000 RSI: 0000000000000000 RDI: 0000000000000203
[   45.021084] RBP: ffff88013a3f31e8 R08: 0000000000000001 R09: 0000000000000000
[   45.021986] R10: ffffffff827ec29c R11: 0000000000000002 R12: 0000000000000001
[   45.022946] R13: ffff88013a230008 R14: ffff880117802b20 R15: ffffc90000863e8f
[   45.023842] FS:  0000000000000000(0000) GS:ffff88013fd00000(0000) knlGS:0000000000000000
[   45.024863] CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
[   45.025583] CR2: ffffc900006d4000 CR3: 000000000220f000 CR4: 00000000000006a0
[   45.026478] Call Trace:
[   45.026811]  __e1000_shutdown+0x1d4/0x1e2:
						__e1000_shutdown at drivers/net/ethernet/intel/e1000/e1000_main.c:5162
[   45.027344]  ? rcu_perf_cleanup+0x2a1/0x2a1:
						rcu_perf_shutdown at kernel/rcu/rcuperf.c:627
[   45.027883]  e1000_shutdown+0x14/0x3a:
						e1000_shutdown at drivers/net/ethernet/intel/e1000/e1000_main.c:5235
[   45.028351]  device_shutdown+0x110/0x1aa:
						device_shutdown at drivers/base/core.c:2807
[   45.028858]  kernel_power_off+0x31/0x64:
						kernel_power_off at kernel/reboot.c:260
[   45.029343]  rcu_perf_shutdown+0x9b/0xa7:
						rcu_perf_shutdown at kernel/rcu/rcuperf.c:637
[   45.029852]  ? __wake_up_common_lock+0xa2/0xa2:
						autoremove_wake_function at kernel/sched/wait.c:376
[   45.030414]  kthread+0x126/0x12e:
						kthread at kernel/kthread.c:233
[   45.030834]  ? __kthread_bind_mask+0x8e/0x8e:
						kthread at kernel/kthread.c:190
[   45.031399]  ? ret_from_fork+0x1f/0x30:
						ret_from_fork at arch/x86/entry/entry_64.S:443
[   45.031883]  ? kernel_init+0xa/0xf5:
						kernel_init at init/main.c:997
[   45.032325]  ret_from_fork+0x1f/0x30:
						ret_from_fork at arch/x86/entry/entry_64.S:443
[   45.032777] Code: 00 48 85 ed 75 07 48 8b ab a8 00 00 00 48 8d bb 98 00 00 00 e8 aa d1 11 00 48 89 ea 48 89 c6 48 c7 c7 d8 e4 0b 82 e8 55 7d da ff <0f> ff b9 01 00 00 00 31 d2 be 01 00 00 00 48 c7 c7 f0 b1 61 82
[   45.035222] ---[ end trace c257137b1b1976ef ]---
[   45.037838] ACPI: Preparing to enter system sleep state S5

---
 drivers/net/ethernet/intel/e1000/e1000.h      |    3 +-
 drivers/net/ethernet/intel/e1000/e1000_main.c |   27 +++++++++++++++++++++-----
 2 files changed, 24 insertions(+), 6 deletions(-)

@@ -328,7 +328,8 @@ struct e1000_adapter {
 enum e1000_state_t {
 	__E1000_TESTING,
 	__E1000_RESETTING,
-	__E1000_DOWN
+	__E1000_DOWN,
+	__E1000_DISABLED
 };
 
 #undef pr_fmt

@@ -940,7 +940,7 @@ static int e1000_init_hw_struct(struct e
 static int e1000_probe(struct pci_dev *pdev, const struct pci_device_id *ent)
 {
 	struct net_device *netdev;
-	struct e1000_adapter *adapter;
+	struct e1000_adapter *adapter = NULL;
 	struct e1000_hw *hw;
 
 	static int cards_found = 0;

@@ -950,6 +950,7 @@ static int e1000_probe(struct pci_dev *p
 	u16 tmp = 0;
 	u16 eeprom_apme_mask = E1000_EEPROM_APME;
 	int bars, need_ioport;
+	bool disable_dev = false;
 
 	/* do not allocate ioport bars when not needed */
 	need_ioport = e1000_is_need_ioport(pdev);

@@ -1250,11 +1251,13 @@ err_mdio_ioremap:
 	iounmap(hw->ce4100_gbe_mdio_base_virt);
 	iounmap(hw->hw_addr);
 err_ioremap:
+	disable_dev = !test_and_set_bit(__E1000_DISABLED, &adapter->flags);
 	free_netdev(netdev);
 err_alloc_etherdev:
 	pci_release_selected_regions(pdev, bars);
 err_pci_reg:
-	pci_disable_device(pdev);
+	if (!adapter || disable_dev)
+		pci_disable_device(pdev);
 	return err;
 }
 

@@ -1272,6 +1275,7 @@ static void e1000_remove(struct pci_dev
 	struct net_device *netdev = pci_get_drvdata(pdev);
 	struct e1000_adapter *adapter = netdev_priv(netdev);
 	struct e1000_hw *hw = &adapter->hw;
+	bool disable_dev;
 
 	e1000_down_and_stop(adapter);
 	e1000_release_manageability(adapter);

@@ -1290,9 +1294,11 @@ static void e1000_remove(struct pci_dev
 		iounmap(hw->flash_address);
 	pci_release_selected_regions(pdev, adapter->bars);
 
+	disable_dev = !test_and_set_bit(__E1000_DISABLED, &adapter->flags);
 	free_netdev(netdev);
 
-	pci_disable_device(pdev);
+	if (disable_dev)
+		pci_disable_device(pdev);
 }
 
 /**

@@ -5137,7 +5143,8 @@ static int __e1000_shutdown(struct pci_d
 	if (netif_running(netdev))
 		e1000_free_irq(adapter);
 
-	pci_disable_device(pdev);
+	if (!test_and_set_bit(__E1000_DISABLED, &adapter->flags))
+		pci_disable_device(pdev);
 
 	return 0;
 }

@@ -5181,6 +5188,10 @@ static int e1000_resume(struct pci_dev *
 		pr_err("Cannot enable PCI device from suspend\n");
 		return err;
 	}
+
+	/* flush memory to make sure state is correct */
+	smp_mb__before_atomic();
+	clear_bit(__E1000_DISABLED, &adapter->flags);
 	pci_set_master(pdev);
 
 	pci_enable_wake(pdev, PCI_D3hot, 0);

@@ -5255,7 +5266,9 @@ static pci_ers_result_t e1000_io_error_d
 
 	if (netif_running(netdev))
 		e1000_down(adapter);
-	pci_disable_device(pdev);
+
+	if (!test_and_set_bit(__E1000_DISABLED, &adapter->flags))
+		pci_disable_device(pdev);
 
 	/* Request a slot slot reset. */
 	return PCI_ERS_RESULT_NEED_RESET;

@@ -5283,6 +5296,10 @@ static pci_ers_result_t e1000_io_slot_re
 		pr_err("Cannot re-enable PCI device after reset.\n");
 		return PCI_ERS_RESULT_DISCONNECT;
 	}
+
+	/* flush memory to make sure state is correct */
+	smp_mb__before_atomic();
+	clear_bit(__E1000_DISABLED, &adapter->flags);
 	pci_set_master(pdev);
 
 	pci_enable_wake(pdev, PCI_D3hot, 0);

Patches currently in stable-queue which might be from [email protected] are

queue-3.18/e1000-fix-disabling-already-disabled-warning.patch