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We should only tell the hardware its capable of DMA'ing to us only what we asked dev_alloc_skb(). Prior to this it is possible a large RX'd frame could have corrupted DMA data but for us but we were saved only because we were previously also pci_map_single()'ing the same large value. The issue prior to this though was we were unmapping a smaller amount which the prior DMA patch fixed. Signed-off-by: Bennyam Malavazi <Bennyam.Malavazi@atheros.com> Signed-off-by: Luis R. Rodriguez <lrodriguez@atheros.com> Signed-off-by: John W. Linville <linville@tuxdriver.com>