I have actually tested igb driver on the real hardware(Intel 82575EB PCI-E
Gigabit Ethernet Controller), and find some potential bugs:
The target file is drivers/net/ethernet/intel/igb/igb_main.c
(1) In the normal process of igb, pci_enable_pcie_error_reporting and
pci_disable_pcie_error_reporting is called in pairs in igb_probe and
igb_remove. However, when pci_enable_pcie_error_reporting has been called
and alloc_etherdev_mqs in igb_probe is failed, "err_alloc_etherdev" segment
in igb_probe is executed immediately to exit, but
pci_disable_pcie_error_reporting is not called.
(2) The same situation happens when pci_iomap in igb_probe is failed.
(3) The same situation happens when igb_sw_init in igb_probe is failed.
(4) The same situation happens when register_netdev in igb_probe is failed.
(5) The same situation happens when igb_init_i2c in igb_probe is failed.
(6) The function kcalloc is called by igb_sw_init when initializing the
ethernet card driver, but kfree is not called when register_netdev in
igb_probe is failed, which may cause memory leak.
(7) The same situation happens when igb_init_i2c in igb_probe is failed.
(8) The same situation happens when kzalloc in igb_alloc_q_vector is failed.
(9) The same situation happens when igb_alloc_q_vector in
igb_alloc_q_vectors is failed.
(10) When igb_init_i2c in igb_probe is failed, igb_enable_sriov is called in
igb_probe_vfs, but igb_disable_sriov is not called.
(11) The same situation with [10] happens when register_netdev in igb_probe
is failed.
Meanwhile, I also write the patch to fix the bugs. I have run the patch on
the hardware, it can work normally and fix the above bugs.
diff --git a/drivers/net/ethernet/intel/igb/igb_main.c
b/drivers/net/ethernet/intel/igb/igb_main.c
index 487cd9c..cd9364a 100644
--- a/drivers/net/ethernet/intel/igb/igb_main.c
+++ b/drivers/net/ethernet/intel/igb/igb_main.c
@@ -179,6 +179,7 @@ static void igb_check_vf_rate_limit(struct igb_adapter
*);
#ifdef CONFIG_PCI_IOV
static int igb_vf_configure(struct igb_adapter *adapter, int vf);
static int igb_pci_enable_sriov(struct pci_dev *dev, int num_vfs);
+static int igb_disable_sriov(struct pci_dev *pdev);
#endif
#ifdef CONFIG_PM
@@ -2653,17 +2654,22 @@ err_register:
igb_release_hw_control(adapter);
memset(&adapter->i2c_adap, 0, sizeof(adapter->i2c_adap));
err_eeprom:
+#ifdef CONFIG_PCI_IOV
+ igb_disable_sriov(pdev);
+#endif
if (!igb_check_reset_block(hw))
igb_reset_phy(hw);
if (hw->flash_address)
iounmap(hw->flash_address);
err_sw_init:
+ kfree(adapter->shadow_vfta);
igb_clear_interrupt_scheme(adapter);
pci_iounmap(pdev, hw->hw_addr);
err_ioremap:
free_netdev(netdev);
err_alloc_etherdev:
+ pci_disable_pcie_error_reporting(pdev);
pci_release_selected_regions(pdev,
pci_select_bars(pdev, IORESOURCE_MEM));
err_pci_reg:
Thanks!
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