[PATCH v2] igb: don't unmap NULL hw_addr
From: Jarod Wilson
Date: Thu Sep 10 2015 - 15:38:10 EST
I've got a startech thunderbolt dock someone loaned me, which among other
things, has the following device in it:
08:00.0 Ethernet controller: Intel Corporation I210 Gigabit Network Connection (rev 03)
This hotplugs just fine (kernel 4.2.0 plus a patch or two here):
[ 863.020315] igb: Intel(R) Gigabit Ethernet Network Driver - version 5.2.18-k
[ 863.020316] igb: Copyright (c) 2007-2014 Intel Corporation.
[ 863.028657] igb 0000:08:00.0: enabling device (0000 -> 0002)
[ 863.062089] igb 0000:08:00.0: added PHC on eth0
[ 863.062090] igb 0000:08:00.0: Intel(R) Gigabit Ethernet Network Connection
[ 863.062091] igb 0000:08:00.0: eth0: (PCIe:2.5Gb/s:Width x1) e8:ea:6a:00:1b:2a
[ 863.062194] igb 0000:08:00.0: eth0: PBA No: 000200-000
[ 863.062196] igb 0000:08:00.0: Using MSI-X interrupts. 4 rx queue(s), 4 tx queue(s)
[ 863.064889] igb 0000:08:00.0 enp8s0: renamed from eth0
But disconnecting it is another story:
[ 1002.807932] igb 0000:08:00.0: removed PHC on enp8s0
[ 1002.807944] igb 0000:08:00.0 enp8s0: PCIe link lost, device now detached
[ 1003.341141] ------------[ cut here ]------------
[ 1003.341148] WARNING: CPU: 0 PID: 199 at lib/iomap.c:43 bad_io_access+0x38/0x40()
[ 1003.341149] Bad IO access at port 0x0 ()
[ 1003.342767] Modules linked in: snd_usb_audio snd_usbmidi_lib snd_rawmidi igb dca firewire_ohci firewire_core crc_itu_t rfcomm ctr ccm arc4 iwlmvm mac80211 fuse xt_CHECKSUM ipt_MASQUERADE
nf_nat_masquerade_ipv4 tun ip6t_rpfilter ip6t_REJECT nf_reject_ipv6 ipt_REJECT nf_reject_ipv4 xt_conntrack ebtable_nat ebtable_broute bridge stp llc ebtable_filter ebtables ip6table_nat
nf_conntrack_ipv6 nf_defrag_ipv6 nf_nat_ipv6 ip6table_mangle ip6table_security ip6table_raw ip6table_filter ip6_tables iptable_nat nf_conntrack_ipv4 nf_defrag_ipv4 nf_nat_ipv4 nf_nat
nf_conntrack iptable_mangle iptable_security iptable_raw iptable_filter bnep dm_mirror dm_region_hash dm_log dm_mod coretemp x86_pkg_temp_thermal intel_powerclamp kvm_intel snd_hda_codec_hdmi kvm
crct10dif_pclmul crc32_pclmul ghash_clmulni_intel drbg
[ 1003.342793] ansi_cprng aesni_intel hp_wmi aes_x86_64 iTCO_wdt lrw iTCO_vendor_support ppdev gf128mul sparse_keymap glue_helper ablk_helper cryptd snd_hda_codec_realtek snd_hda_codec_generic
microcode snd_hda_intel uvcvideo iwlwifi snd_hda_codec videobuf2_vmalloc videobuf2_memops snd_hda_core videobuf2_core snd_hwdep btusb v4l2_common btrtl snd_seq btbcm btintel videodev cfg80211
snd_seq_device rtsx_pci_ms bluetooth pcspkr input_leds i2c_i801 media parport_pc memstick rfkill sg lpc_ich snd_pcm 8250_fintek parport joydev snd_timer snd soundcore hp_accel ie31200_edac
mei_me lis3lv02d edac_core input_polldev mei hp_wireless shpchp tpm_infineon sch_fq_codel nfsd auth_rpcgss nfs_acl lockd grace sunrpc ip_tables autofs4 xfs libcrc32c sd_mod sr_mod cdrom
rtsx_pci_sdmmc mmc_core crc32c_intel serio_raw rtsx_pci
[ 1003.342822] nouveau ahci libahci mxm_wmi e1000e xhci_pci hwmon ptp drm_kms_helper pps_core xhci_hcd ttm wmi video ipv6
[ 1003.342839] CPU: 0 PID: 199 Comm: kworker/0:2 Not tainted 4.2.0-2.el7_UNSUPPORTED.x86_64 #1
[ 1003.342840] Hardware name: Hewlett-Packard HP ZBook 15 G2/2253, BIOS M70 Ver. 01.07 02/26/2015
[ 1003.342843] Workqueue: pciehp-3 pciehp_power_thread
[ 1003.342844] ffffffff81a90655 ffff8804866d3b48 ffffffff8164763a 0000000000000000
[ 1003.342846] ffff8804866d3b98 ffff8804866d3b88 ffffffff8107134a ffff8804866d3b88
[ 1003.342847] ffff880486f46000 ffff88046c8a8000 ffff880486f46840 ffff88046c8a8098
[ 1003.342848] Call Trace:
[ 1003.342852] [<ffffffff8164763a>] dump_stack+0x45/0x57
[ 1003.342855] [<ffffffff8107134a>] warn_slowpath_common+0x8a/0xc0
[ 1003.342857] [<ffffffff810713c6>] warn_slowpath_fmt+0x46/0x50
[ 1003.342859] [<ffffffff8133719e>] ? pci_disable_msix+0x3e/0x50
[ 1003.342860] [<ffffffff812f6328>] bad_io_access+0x38/0x40
[ 1003.342861] [<ffffffff812f6567>] pci_iounmap+0x27/0x40
[ 1003.342865] [<ffffffffa0b728d7>] igb_remove+0xc7/0x160 [igb]
[ 1003.342867] [<ffffffff8132189f>] pci_device_remove+0x3f/0xc0
[ 1003.342869] [<ffffffff81433426>] __device_release_driver+0x96/0x130
[ 1003.342870] [<ffffffff814334e3>] device_release_driver+0x23/0x30
[ 1003.342871] [<ffffffff8131b404>] pci_stop_bus_device+0x94/0xa0
[ 1003.342872] [<ffffffff8131b3ad>] pci_stop_bus_device+0x3d/0xa0
[ 1003.342873] [<ffffffff8131b3ad>] pci_stop_bus_device+0x3d/0xa0
[ 1003.342874] [<ffffffff8131b516>] pci_stop_and_remove_bus_device+0x16/0x30
[ 1003.342876] [<ffffffff81333f5b>] pciehp_unconfigure_device+0x9b/0x180
[ 1003.342877] [<ffffffff81333a73>] pciehp_disable_slot+0x43/0xb0
[ 1003.342878] [<ffffffff81333b6d>] pciehp_power_thread+0x8d/0xb0
[ 1003.342885] [<ffffffff810881b2>] process_one_work+0x152/0x3d0
[ 1003.342886] [<ffffffff8108854a>] worker_thread+0x11a/0x460
[ 1003.342887] [<ffffffff81088430>] ? process_one_work+0x3d0/0x3d0
[ 1003.342890] [<ffffffff8108ddd9>] kthread+0xc9/0xe0
[ 1003.342891] [<ffffffff8108dd10>] ? kthread_create_on_node+0x180/0x180
[ 1003.342893] [<ffffffff8164e29f>] ret_from_fork+0x3f/0x70
[ 1003.342894] [<ffffffff8108dd10>] ? kthread_create_on_node+0x180/0x180
[ 1003.342895] ---[ end trace 65a77e06d5aa9358 ]---
Upon looking at the igb driver, I see that igb_rd32() attempted to read from
hw_addr and failed, so it set hw->hw_addr to NULL and spit out the message
in the log output above, "PCIe link lost, device now detached".
Well, now that hw_addr is NULL, the attempt to call pci_iounmap is obviously
not going to go well. As suggested by Mark Rustad, do something similar to
what ixgbe does, and save a copy of hw_addr as adapter->io_addr, so we can
still call pci_iounmap on it on teardown. Additionally, for consistency,
make the pci_iomap call assignment directly to io_addr, so map and unmap
match.
CC: Mark Rustad <mark.d.rustad@xxxxxxxxx>
CC: Jeff Kirsher <jeffrey.t.kirsher@xxxxxxxxx>
CC: intel-wired-lan@xxxxxxxxxxxxxxxx
CC: netdev@xxxxxxxxxxxxxxx
Signed-off-by: Jarod Wilson <jarod@xxxxxxxxxx>
---
drivers/net/ethernet/intel/igb/igb.h | 2 ++
drivers/net/ethernet/intel/igb/igb_main.c | 10 ++++++----
2 files changed, 8 insertions(+), 4 deletions(-)
diff --git a/drivers/net/ethernet/intel/igb/igb.h b/drivers/net/ethernet/intel/igb/igb.h
index 212d668..df1d1c5 100644
--- a/drivers/net/ethernet/intel/igb/igb.h
+++ b/drivers/net/ethernet/intel/igb/igb.h
@@ -389,6 +389,8 @@ struct igb_adapter {
u16 link_speed;
u16 link_duplex;
+ u8 __iomem *io_addr; /* Mainly for iounmap use */
+
struct work_struct reset_task;
struct work_struct watchdog_task;
bool fc_autoneg;
diff --git a/drivers/net/ethernet/intel/igb/igb_main.c b/drivers/net/ethernet/intel/igb/igb_main.c
index e174fbb..76928b6 100644
--- a/drivers/net/ethernet/intel/igb/igb_main.c
+++ b/drivers/net/ethernet/intel/igb/igb_main.c
@@ -2294,9 +2294,11 @@ static int igb_probe(struct pci_dev *pdev, const struct pci_device_id *ent)
adapter->msg_enable = netif_msg_init(debug, DEFAULT_MSG_ENABLE);
err = -EIO;
- hw->hw_addr = pci_iomap(pdev, 0, 0);
- if (!hw->hw_addr)
+ adapter->io_addr = pci_iomap(pdev, 0, 0);
+ if (!adapter->io_addr)
goto err_ioremap;
+ /* hw->hw_addr can be altered, we'll use adapter->io_addr for unmap */
+ hw->hw_addr = adapter->io_addr;
netdev->netdev_ops = &igb_netdev_ops;
igb_set_ethtool_ops(netdev);
@@ -2656,7 +2658,7 @@ err_sw_init:
#ifdef CONFIG_PCI_IOV
igb_disable_sriov(pdev);
#endif
- pci_iounmap(pdev, hw->hw_addr);
+ pci_iounmap(pdev, adapter->io_addr);
err_ioremap:
free_netdev(netdev);
err_alloc_etherdev:
@@ -2823,7 +2825,7 @@ static void igb_remove(struct pci_dev *pdev)
igb_clear_interrupt_scheme(adapter);
- pci_iounmap(pdev, hw->hw_addr);
+ pci_iounmap(pdev, adapter->io_addr);
if (hw->flash_address)
iounmap(hw->flash_address);
pci_release_selected_regions(pdev,
--
1.8.3.1
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