[PATCH] r8169: do not call rtl8169_down() twice on shutdown

[Niklas Cassel <cassel@kernel.org>]

For a PCI controller driver with a .shutdown() callback, we will see the
following warning:
[   12.020111] called from state HALTED
[   12.020459] WARNING: CPU: 7 PID: 229 at drivers/net/phy/phy.c:1630 phy_stop+0x134/0x1a0

This is because rtl8169_down() (which calls phy_stop()) is called twice
during shutdown.

First time:
[   23.827764] Call trace:
[   23.827765]  show_stack+0x20/0x40 (C)
[   23.827774]  dump_stack_lvl+0x60/0x80
[   23.827778]  dump_stack+0x18/0x24
[   23.827782]  rtl8169_down+0x30/0x2a0
[   23.827788]  rtl_shutdown+0xb0/0xc0
[   23.827792]  pci_device_shutdown+0x3c/0x88
[   23.827797]  device_shutdown+0x150/0x278
[   23.827802]  kernel_restart+0x4c/0xb8

Second time:
[   23.841468] Call trace:
[   23.841470]  show_stack+0x20/0x40 (C)
[   23.841478]  dump_stack_lvl+0x60/0x80
[   23.841483]  dump_stack+0x18/0x24
[   23.841486]  rtl8169_down+0x30/0x2a0
[   23.841492]  rtl8169_close+0x64/0x100
[   23.841496]  __dev_close_many+0xbc/0x1f0
[   23.841502]  dev_close_many+0x94/0x160
[   23.841505]  unregister_netdevice_many_notify+0x160/0x9d0
[   23.841510]  unregister_netdevice_queue+0xf0/0x100
[   23.841515]  unregister_netdev+0x2c/0x58
[   23.841519]  rtl_remove_one+0xa0/0xe0
[   23.841524]  pci_device_remove+0x4c/0xf8
[   23.841528]  device_remove+0x54/0x90
[   23.841534]  device_release_driver_internal+0x1d4/0x238
[   23.841539]  device_release_driver+0x20/0x38
[   23.841544]  pci_stop_bus_device+0x84/0xe0
[   23.841548]  pci_stop_bus_device+0x40/0xe0
[   23.841552]  pci_stop_root_bus+0x48/0x80
[   23.841555]  dw_pcie_host_deinit+0x34/0xe0
[   23.841559]  rockchip_pcie_shutdown+0x20/0x38
[   23.841565]  platform_shutdown+0x2c/0x48
[   23.841571]  device_shutdown+0x150/0x278
[   23.841575]  kernel_restart+0x4c/0xb8

Add a netif_device_present() guard around the rtl8169_down() call in
rtl8169_close(), to avoid rtl8169_down() from being called twice.

This matches how e.g. e1000e_close() has a netif_device_present() guard
around the e1000e_down() call.

Signed-off-by: Niklas Cassel <cassel@kernel.org>
---
 drivers/net/ethernet/realtek/r8169_main.c | 3 ++-
 1 file changed, 2 insertions(+), 1 deletion(-)

diff --git a/drivers/net/ethernet/realtek/r8169_main.c b/drivers/net/ethernet/realtek/r8169_main.c
index 4eebd9cb40a3..0300a06ae260 100644
--- a/drivers/net/ethernet/realtek/r8169_main.c
+++ b/drivers/net/ethernet/realtek/r8169_main.c
@@ -4879,7 +4879,8 @@ static int rtl8169_close(struct net_device *dev)
 	pm_runtime_get_sync(&pdev->dev);
 
 	netif_stop_queue(dev);
-	rtl8169_down(tp);
+	if (netif_device_present(tp->dev))
+		rtl8169_down(tp);
 	rtl8169_rx_clear(tp);
 
 	free_irq(tp->irq, tp);
-- 
2.49.0