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[ Upstream commit f3002c1374fb2367c9d8dbb28852791ef90d2bac ] The gen bits must be read first from (resp. written last to) DMA memory. The proper way to enforce this on Linux is to call dma_rmb() (resp. dma_wmb()). Signed-off-by: Regis Duchesne <hpreg@vmware.com> Acked-by: Ronak Doshi <doshir@vmware.com> Signed-off-by: David S. Miller <davem@davemloft.net> Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>