From mboxrd@z Thu Jan 1 00:00:00 1970 From: Emil Tantilov Date: Tue, 08 Nov 2016 11:47:33 -0800 Subject: [Intel-wired-lan] [PATCH v2] ixgbe: handle close/suspend race with netif_device_detach/present Message-ID: <20161108194733.29155.16082.stgit@localhost6.localdomain6> MIME-Version: 1.0 Content-Type: text/plain; charset="us-ascii" Content-Transfer-Encoding: 7bit To: intel-wired-lan@osuosl.org List-ID: When an interface is part of a namespace it is possible that ixgbe_close() may be called while __ixgbe_shutdown() is running which ends up in a double free WARN and/or a BUG in free_msi_irqs(). To handle this situation we extend the rtnl_lock() to protect the call to netif_device_detach() and ixgbe_clear_interrupt_scheme() in __ixgbe_shutdown() and check for netif_device_present() to avoid clearing the interrupts second time in ixgbe_close() and ixgbe_remove(). Also extend the rtnl lock in ixgbe_resume() to netif_device_attach(). v2 - add rtnl locks and a check in ixgbe_remove() Signed-off-by: Emil Tantilov --- drivers/net/ethernet/intel/ixgbe/ixgbe_main.c | 22 ++++++++++++---------- 1 file changed, 12 insertions(+), 10 deletions(-) diff --git a/drivers/net/ethernet/intel/ixgbe/ixgbe_main.c b/drivers/net/ethernet/intel/ixgbe/ixgbe_main.c index 51cdac9..0b1fa5d 100644 --- a/drivers/net/ethernet/intel/ixgbe/ixgbe_main.c +++ b/drivers/net/ethernet/intel/ixgbe/ixgbe_main.c @@ -6200,7 +6200,8 @@ int ixgbe_close(struct net_device *netdev) ixgbe_ptp_stop(adapter); - ixgbe_close_suspend(adapter); + if (netif_device_present(netdev)) + ixgbe_close_suspend(adapter); ixgbe_fdir_filter_exit(adapter); @@ -6245,14 +6246,12 @@ static int ixgbe_resume(struct pci_dev *pdev) if (!err && netif_running(netdev)) err = ixgbe_open(netdev); - rtnl_unlock(); - - if (err) - return err; - netif_device_attach(netdev); + if (!err) + netif_device_attach(netdev); + rtnl_unlock(); - return 0; + return err; } #endif /* CONFIG_PM */ @@ -6267,14 +6266,14 @@ static int __ixgbe_shutdown(struct pci_dev *pdev, bool *enable_wake) int retval = 0; #endif + rtnl_lock(); netif_device_detach(netdev); - rtnl_lock(); if (netif_running(netdev)) ixgbe_close_suspend(adapter); - rtnl_unlock(); ixgbe_clear_interrupt_scheme(adapter); + rtnl_unlock(); #ifdef CONFIG_PM retval = pci_save_state(pdev); @@ -9923,7 +9922,10 @@ static void ixgbe_remove(struct pci_dev *pdev) if (netdev->reg_state == NETREG_REGISTERED) unregister_netdev(netdev); - ixgbe_clear_interrupt_scheme(adapter); + rtnl_lock(); + if (netif_device_present(netdev)) + ixgbe_clear_interrupt_scheme(adapter); + rtnl_unlock(); ixgbe_release_hw_control(adapter);