r8169: fix DMA being used after buffer free if WoL is enabled

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IOMMU errors have been reported if WoL is enabled and interface is
brought down. It turned out that the network chip triggers DMA
transfers after the DMA buffers have been freed. For WoL to work we
need to leave rx enabled, therefore simply stop the chip from being
a DMA busmaster.

Fixes: 567ca57faa ("r8169: add rtl8169_up")
Tested-by: Paul Blazejowski <paulb@blazebox.homeip.net>
Signed-off-by: Heiner Kallweit <hkallweit1@gmail.com>
Signed-off-by: David S. Miller <davem@davemloft.net>

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Heiner Kallweit 2021-03-20 21:40:08 +01:00 • committed by David S. Miller

parent 49371a8a66

commit f658b90977

1 changed files with 4 additions and 2 deletions

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drivers/net/ethernet/realtek/r8169_main.c

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