Re: [PATCH net] r8169: fix rtl8125b dmar pte write access not set error

[Heiner Kallweit <hkallweit1@gmail.com>]

On 12.10.2022 09:59, Hau wrote:
>>
>> On 04.10.2022 10:10, Chunhao Lin wrote:
>>> When close device, rx will be enabled if wol is enabeld. When open
>>> device it will cause rx to dma to wrong address after pci_set_master().
>>>
>>> In this patch, driver will disable tx/rx when close device. If wol is
>>> eanbled only enable rx filter and disable rxdv_gate to let hardware
>>> can receive packet to fifo but not to dma it.
>>>
>>> Fixes: 120068481405 ("r8169: fix failing WoL")
>>> Signed-off-by: Chunhao Lin <hau@realtek.com>
>>> ---
>>>  drivers/net/ethernet/realtek/r8169_main.c | 14 +++++++-------
>>>  1 file changed, 7 insertions(+), 7 deletions(-)
>>>
>>> diff --git a/drivers/net/ethernet/realtek/r8169_main.c
>>> b/drivers/net/ethernet/realtek/r8169_main.c
>>> index 1b7fdb4f056b..c09cfbe1d3f0 100644
>>> --- a/drivers/net/ethernet/realtek/r8169_main.c
>>> +++ b/drivers/net/ethernet/realtek/r8169_main.c
>>> @@ -2239,6 +2239,9 @@ static void rtl_wol_enable_rx(struct
>> rtl8169_private *tp)
>>>  	if (tp->mac_version >= RTL_GIGA_MAC_VER_25)
>>>  		RTL_W32(tp, RxConfig, RTL_R32(tp, RxConfig) |
>>>  			AcceptBroadcast | AcceptMulticast | AcceptMyPhys);
>>> +
>>> +	if (tp->mac_version >= RTL_GIGA_MAC_VER_40)
>>> +		RTL_W32(tp, MISC, RTL_R32(tp, MISC) & ~RXDV_GATED_EN);
>>
>> Is this correct anyway? Supposedly you want to set this bit to disable DMA.
>>
> If wol is enabled, driver need to disable hardware rxdv_gate for receiving packets.
> 
OK, I see. But why disable it here? I see no scenario where rxdv_gate would be enabled
when we get here.