This is a note to let you know that I've just added the patch titled
igb: close/suspend race in netif_device_detach
to the 4.4-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:
igb-close-suspend-race-in-netif_device_detach.patch
and it can be found in the queue-4.4 subdirectory.
If you, or anyone else, feels it should not be added to the stable tree,
please let <stable@xxxxxxxxxxxxxxx> know about it.
>From foo@baz Sun Nov 19 12:02:55 CET 2017
From: Todd Fujinaka <todd.fujinaka@xxxxxxxxx>
Date: Tue, 15 Nov 2016 08:54:26 -0800
Subject: igb: close/suspend race in netif_device_detach
From: Todd Fujinaka <todd.fujinaka@xxxxxxxxx>
[ Upstream commit 9474933caf21a4cb5147223dca1551f527aaac36 ]
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@xxxxxxxxx>
Acked-by: Alexander Duyck <alexander.h.duyck@xxxxxxxxx>
Tested-by: Aaron Brown <aaron.f.brown@xxxxxxxxx>
Signed-off-by: Jeff Kirsher <jeffrey.t.kirsher@xxxxxxxxx>
Signed-off-by: Sasha Levin <alexander.levin@xxxxxxxxxxx>
Signed-off-by: Greg Kroah-Hartman <gregkh@xxxxxxxxxxxxxxxxxxx>
---
drivers/net/ethernet/intel/igb/igb_main.c | 21 ++++++++++++---------
1 file changed, 12 insertions(+), 9 deletions(-)
--- a/drivers/net/ethernet/intel/igb/igb_main.c
+++ b/drivers/net/ethernet/intel/igb/igb_main.c
@@ -3172,7 +3172,9 @@ static int __igb_close(struct net_device
static int igb_close(struct net_device *netdev)
{
- return __igb_close(netdev, false);
+ if (netif_device_present(netdev))
+ return __igb_close(netdev, false);
+ return 0;
}
/**
@@ -7325,12 +7327,14 @@ static int __igb_shutdown(struct pci_dev
int retval = 0;
#endif
+ rtnl_lock();
netif_device_detach(netdev);
if (netif_running(netdev))
__igb_close(netdev, true);
igb_clear_interrupt_scheme(adapter);
+ rtnl_unlock();
#ifdef CONFIG_PM
retval = pci_save_state(pdev);
@@ -7450,16 +7454,15 @@ 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)
Patches currently in stable-queue which might be from todd.fujinaka@xxxxxxxxx are
queue-4.4/igb-close-suspend-race-in-netif_device_detach.patch