net: mv643xx_eth: Defer writing the first TX descriptor when using TSO

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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: Philipp Kirchhofer <philipp@familie-kirchhofer.de>
Signed-off-by: David S. Miller <davem@davemloft.net>

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Philipp Kirchhofer 2015-10-18 16:02:44 +02:00 • committed by David S. Miller

parent 91986fd3d3

commit 968200f322

1 changed files with 23 additions and 3 deletions

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26

drivers/net/ethernet/marvell/mv643xx_eth.c

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