igb: close/suspend race in netif_device_detach

Similar to ixgbe, when an interface is part of a namespace it is
possible that igb_close() may be called while __igb_shutdown() is
running which ends up in a double free WARN and/or a BUG in
free_msi_irqs().

Extend the rtnl_lock() to protect the call to netif_device_detach() and
igb_clear_interrupt_scheme() in __igb_shutdown() and check for
netif_device_present() to avoid calling igb_clear_interrupt_scheme() a
second time in igb_close().

Also extend the rtnl lock in igb_resume() to netif_device_attach().

Signed-off-by: Todd Fujinaka <todd.fujinaka@intel.com>
Acked-by: Alexander Duyck <alexander.h.duyck@intel.com>
Tested-by: Aaron Brown <aaron.f.brown@intel.com>
Signed-off-by: Jeff Kirsher <jeffrey.t.kirsher@intel.com>

diff --git a/drivers/net/ethernet/intel/igb/igb_main.c b/drivers/net/ethernet/intel/igb/igb_main.c
index 82069bc..594604e 100644 (file)
--- a/drivers/net/ethernet/intel/igb/igb_main.c
+++ b/drivers/net/ethernet/intel/igb/igb_main.c
@@ -3275,7 +3275,9 @@ static int __igb_close(struct net_device *netdev, bool suspending)
 
 int igb_close(struct net_device *netdev)
 {
-       return __igb_close(netdev, false);
+       if (netif_device_present(netdev))
+               return __igb_close(netdev, false);
+       return 0;
 }
 
 /**
@@ -7564,6 +7566,7 @@ static int __igb_shutdown(struct pci_dev *pdev, bool *enable_wake,
        int retval = 0;
 #endif
 
+       rtnl_lock();
        netif_device_detach(netdev);
 
        if (netif_running(netdev))
@@ -7572,6 +7575,7 @@ static int __igb_shutdown(struct pci_dev *pdev, bool *enable_wake,
        igb_ptp_suspend(adapter);
 
        igb_clear_interrupt_scheme(adapter);
+       rtnl_unlock();
 
 #ifdef CONFIG_PM
        retval = pci_save_state(pdev);
@@ -7690,16 +7694,15 @@ static int igb_resume(struct device *dev)
 
        wr32(E1000_WUS, ~0);
 
-       if (netdev->flags & IFF_UP) {
-               rtnl_lock();
+       rtnl_lock();
+       if (!err && netif_running(netdev))
                err = __igb_open(netdev, true);
-               rtnl_unlock();
-               if (err)
-                       return err;
-       }
 
-       netif_device_attach(netdev);
-       return 0;
+       if (!err)
+               netif_device_attach(netdev);
+       rtnl_unlock();
+
+       return err;
 }
 
 static int igb_runtime_idle(struct device *dev)