net: mvneta: Avoid unmapping the TSO header buffers
authorEzequiel Garcia <ezequiel.garcia@free-electrons.com>
Fri, 30 May 2014 16:40:07 +0000 (13:40 -0300)
committerDavid S. Miller <davem@davemloft.net>
Mon, 2 Jun 2014 23:16:05 +0000 (16:16 -0700)
commit2e3173a3d38bbb5e29a6a734e7366855c12efbe9
tree7a13e38888596dbceb401a7fae2a87481426fa39
parentba7e46ef9d4550f76efb70739728c50bbf94c3a9
net: mvneta: Avoid unmapping the TSO header buffers

The buffers for the TSO headers belong to a DMA coherent region which is
allocated at ndo_open() time, and released at ndo_stop() time.

Therefore, and contrary to the TSO payload descriptor buffers, the TSO header
buffers don't need to be unmapped. This commit adds a check to detect a
TSO header buffer and explicitly prevent the unmap.

Signed-off-by: Ezequiel Garcia <ezequiel.garcia@free-electrons.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
drivers/net/ethernet/marvell/mvneta.c