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r8169: reset bus if NIC isn't accessible after tx timeout

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ASPM issues may result in the NIC not being accessible any longer.
In this case disabling ASPM may not work. Therefore detect this case
by checking whether register reads return ~0, and try to make the
NIC accessible again by resetting the secondary bus.

v2:
- add exception handling for the case that pci_reset_bus() fails

Suggested-by: Alexander Duyck <alexander.duyck@gmail.com>
Signed-off-by: Heiner Kallweit <hkallweit1@gmail.com>
Reviewed-by: Alexander Duyck <alexanderduyck@fb.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
This commit is contained in:
Heiner Kallweit 2023-01-13 23:46:19 +01:00 committed by David S. Miller
parent 9627c981ac
commit ce870af395
1 changed files with 10 additions and 0 deletions
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10
drivers/net/ethernet/realtek/r8169_main.c
View file

@ -4532,6 +4532,16 @@ static void rtl_task(struct work_struct *work)
goto out_unlock;
if (test_and_clear_bit(RTL_FLAG_TASK_TX_TIMEOUT, tp->wk.flags)) {
/* if chip isn't accessible, reset bus to revive it */
if (RTL_R32(tp, TxConfig) == ~0) {
ret = pci_reset_bus(tp->pci_dev);
if (ret < 0) {
netdev_err(tp->dev, "Can't reset secondary PCI bus, detach NIC\n");
netif_device_detach(tp->dev);
goto out_unlock;
}
}
/* ASPM compatibility issues are a typical reason for tx timeouts */
ret = pci_disable_link_state(tp->pci_dev, PCIE_LINK_STATE_L1 |
PCIE_LINK_STATE_L0S);