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27 March 2024, 02:37:15 UTC
Revision 89ba879e95582d3bba55081e45b5409e883312ca authored by Finn Thain on 22 January 2020, 22:07:26 UTC, committed by David S. Miller on 23 January 2020, 20:24:37 UTC 
net/sonic: Fix receive buffer replenishment
 
As soon as the driver is finished with a receive buffer it allocs a new
one and overwrites the corresponding RRA entry with a new buffer pointer.

Problem is, the buffer pointer is split across two word-sized registers.
It can't be updated in one atomic store. So this operation races with the
chip while it stores received packets and advances its RRP register.
This could result in memory corruption by a DMA write.

Avoid this problem by adding buffers only at the location given by the
RWP register, in accordance with the National Semiconductor datasheet.

Re-factor this code into separate functions to calculate a RRA pointer
and to update the RWP.

Fixes: efcce839360f ("[PATCH] macsonic/jazzsonic network drivers update")
Tested-by: Stan Johnson <userm57@yahoo.com>
Signed-off-by: Finn Thain <fthain@telegraphics.com.au>
Signed-off-by: David S. Miller <davem@davemloft.net>
1 parent 94b1663
History
Tip revision: 89ba879e95582d3bba55081e45b5409e883312ca authored by Finn Thain on 22 January 2020, 22:07:26 UTC
net/sonic: Fix receive buffer replenishment
Tip revision: 89ba879
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