8139too: move wmb before TX DMA start

The write barrier should be used before starting a DMA transfer. This fixes
a problem, where almost all packets received on another machine had garbled
content. Tested with an RTL8100C on a MIPS machine.

Signed-off-by: Andreas Oberritter <[email protected]>
Signed-off-by: David S. Miller <[email protected]>
1 file changed