From 1e4c32f3ede19bdb738aec2cc3cf69439d7b9310 Mon Sep 17 00:00:00 2001 From: Jacob Keller Date: Fri, 11 Mar 2016 09:52:32 -0800 Subject: [PATCH] fm10k: prevent RCU issues during AER events During an AER action response, we were calling fm10k_close without holding the rtnl_lock() which could lead to possible RCU warnings being produced due to 64bit stat updates among other causes. Similarly, we need rtnl_lock() around fm10k_open during fm10k_io_resume. Follow the same pattern elsewhere in the driver and protect the entire open/close sequence. Signed-off-by: Jacob Keller Tested-by: Krishneil Singh Signed-off-by: Jeff Kirsher --- drivers/net/ethernet/intel/fm10k/fm10k_pci.c | 11 ++++++++++- 1 file changed, 10 insertions(+), 1 deletion(-) diff --git a/drivers/net/ethernet/intel/fm10k/fm10k_pci.c b/drivers/net/ethernet/intel/fm10k/fm10k_pci.c index f0992950e228..a604513d0451 100644 --- a/drivers/net/ethernet/intel/fm10k/fm10k_pci.c +++ b/drivers/net/ethernet/intel/fm10k/fm10k_pci.c @@ -2271,6 +2271,8 @@ static pci_ers_result_t fm10k_io_error_detected(struct pci_dev *pdev, if (state == pci_channel_io_perm_failure) return PCI_ERS_RESULT_DISCONNECT; + rtnl_lock(); + if (netif_running(netdev)) fm10k_close(netdev); @@ -2279,6 +2281,8 @@ static pci_ers_result_t fm10k_io_error_detected(struct pci_dev *pdev, /* free interrupts */ fm10k_clear_queueing_scheme(interface); + rtnl_unlock(); + pci_disable_device(pdev); /* Request a slot reset. */ @@ -2349,11 +2353,13 @@ static void fm10k_io_resume(struct pci_dev *pdev) /* reset statistics starting values */ hw->mac.ops.rebind_hw_stats(hw, &interface->stats); + rtnl_lock(); + err = fm10k_init_queueing_scheme(interface); if (err) { dev_err(&interface->pdev->dev, "init_queueing_scheme failed: %d\n", err); - return; + goto unlock; } /* reassociate interrupts */ @@ -2370,6 +2376,9 @@ static void fm10k_io_resume(struct pci_dev *pdev) if (!err) netif_device_attach(netdev); + +unlock: + rtnl_unlock(); } static const struct pci_error_handlers fm10k_err_handler = { -- 2.39.5