net: dwc_eth_qos: Invalidate RX packet DMA buffer

This patch prevents an issue where the RX packet might have been
accessed by the CPU, which now has cached data from the packet in
the caches and possibly various write buffers, and these data may
be evicted from the caches into the DRAM while the buffer is also
written by the DMA.

By invalidating the buffer after the CPU accessed it and before the
DMA populates the buffer, it is assured that the buffer will not be
corrupted.

Reviewed-by: Patrick Delaunay <[email protected]>
Signed-off-by: Marek Vasut <[email protected]>
Cc: Joe Hershberger <[email protected]>
Cc: Patrice Chotard <[email protected]>
Cc: Patrick Delaunay <[email protected]>
Cc: Ramon Fried <[email protected]>
Cc: Stephen Warren <[email protected]>

0 files changed, 0 insertions, 0 deletions