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27 March 2024, 02:37:15 UTC
Revision 7a1bb49461b12b2e6332a4d054256835f45203f3 authored by Dmitry Bogdanov on 09 November 2018, 11:53:57 UTC, committed by David S. Miller on 09 November 2018, 23:38:10 UTC 
net: aquantia: fix potential IOMMU fault after driver unbind
 
IOMMU fault may occurr on unbind/bind or if_down/if_up sequence.

Although driver disables the rings on down, this is not enough.
Due to internal HW design, during subsequent initialization
NIC sometimes may reuse RX descriptors cache and write to the
host memory from the descriptor cache.
That's get catched by IOMMU on host.

This patch invalidates the descriptor cache in NIC on interface down
to prevent writing to the cached descriptors and to the memory pointed
in those descriptors.

Signed-off-by: Dmitry Bogdanov <dmitry.bogdanov@aquantia.com>
Signed-off-by: Igor Russkikh <igor.russkikh@aquantia.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
1 parent 35e8e8b
History
Tip revision: 7a1bb49461b12b2e6332a4d054256835f45203f3 authored by Dmitry Bogdanov on 09 November 2018, 11:53:57 UTC
net: aquantia: fix potential IOMMU fault after driver unbind
Tip revision: 7a1bb49
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