[net-next 09/21] ixgbevf: handle race between close and suspend on shutdown
From: Jeff Kirsher <hidden>
Date: 2016-12-30 09:33:47
Subsystem:
intel ethernet drivers, networking drivers, the rest · Maintainers:
Tony Nguyen, Przemek Kitszel, Andrew Lunn, "David S. Miller", Eric Dumazet, Jakub Kicinski, Paolo Abeni, Linus Torvalds
From: Emil Tantilov <redacted> When an interface is part of a namespace it is possible that ixgbevf_close() may be called while ixgbevf_suspend() 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 check for !netif_device_present() to avoid entering close while in suspend. Also added rtnl locks to ixgbevf_queue_reset_subtask(). CC: Alexander Duyck <redacted> Signed-off-by: Emil Tantilov <redacted> Tested-by: Andrew Bowers <redacted> Signed-off-by: Jeff Kirsher <redacted> --- drivers/net/ethernet/intel/ixgbevf/ixgbevf_main.c | 11 +++++++++-- 1 file changed, 9 insertions(+), 2 deletions(-)
diff --git a/drivers/net/ethernet/intel/ixgbevf/ixgbevf_main.c b/drivers/net/ethernet/intel/ixgbevf/ixgbevf_main.c
index 6d4bef5..8574f21 100644
--- a/drivers/net/ethernet/intel/ixgbevf/ixgbevf_main.c
+++ b/drivers/net/ethernet/intel/ixgbevf/ixgbevf_main.c@@ -3242,6 +3242,9 @@ int ixgbevf_close(struct net_device *netdev) { struct ixgbevf_adapter *adapter = netdev_priv(netdev); + if (!netif_device_present(netdev)) + return 0; + ixgbevf_down(adapter); ixgbevf_free_irq(adapter);
@@ -3268,6 +3271,8 @@ static void ixgbevf_queue_reset_subtask(struct ixgbevf_adapter *adapter) * match packet buffer alignment. Unfortunately, the * hardware is not flexible enough to do this dynamically. */ + rtnl_lock(); + if (netif_running(dev)) ixgbevf_close(dev);
@@ -3276,6 +3281,8 @@ static void ixgbevf_queue_reset_subtask(struct ixgbevf_adapter *adapter) if (netif_running(dev)) ixgbevf_open(dev); + + rtnl_unlock(); } static void ixgbevf_tx_ctxtdesc(struct ixgbevf_ring *tx_ring,
@@ -3796,17 +3803,17 @@ static int ixgbevf_suspend(struct pci_dev *pdev, pm_message_t state) int retval = 0; #endif + rtnl_lock(); netif_device_detach(netdev); if (netif_running(netdev)) { - rtnl_lock(); ixgbevf_down(adapter); ixgbevf_free_irq(adapter); ixgbevf_free_all_tx_resources(adapter); ixgbevf_free_all_rx_resources(adapter); ixgbevf_clear_interrupt_scheme(adapter); - rtnl_unlock(); } + rtnl_unlock(); #ifdef CONFIG_PM retval = pci_save_state(pdev);
--
2.9.3