Felix Fietkau
d2aeca6b6d
ag71xx: fix memory corruption issues on ar7240 on ethernet start/stop ...
When the DMA engine state gets corrupted due to a hardware issues, it
often won't stop rx until a full reset is issued. In that case the hardware
must keep a valid descriptor, otherwise it will write to random places in
system RAM, triggering random crashes. To fix this, keep a dummy descriptor
without a buffer that keeps the DMA engine in a sane state until the reset
is done
SVN-Revision: 27895
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d2aeca6b6d