net: mv643xx_eth: Defer writing the first TX descriptor when using TSO
To prevent a race between the TX DMA engine and the CPU the writing of the first transmit descriptor must be deferred until all following descriptors have been updated. The network card may otherwise start transmitting before all packet descriptors are set up correctly, which leads to data corruption or an aborted transmit operation. This deferral is already done in the non-TSO TX path, implement it also in the TSO TX path. Signed-off-by: NPhilipp Kirchhofer <philipp@familie-kirchhofer.de> Signed-off-by: NDavid S. Miller <davem@davemloft.net>
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