ivtv: Fix PCI DMA direction

The ivtv stream buffers may be for receive or for send but the attached
sg handle is always destined cpu->device. We flush it correctly but the
allocation is wrongly done with the same type as the buffers.

See bug: http://bugzilla.kernel.org/show_bug.cgi?id=13385

(Note this doesn't close the bug - it fixes the ivtv part and in turn
the logging next shows up some rather alarming DMA sg list warnings in
libata)

Signed-off-by: Alan Cox <[e-mail]>
Acked-by: Hans Verkuil <[e-mail]>
Signed-off-by: Linus Torvalds <[e-mail]>

drivers/media/video/ivtv/ivtv-queue.c

···
 		return -ENOMEM;
 	}
 	if (ivtv_might_use_dma(s)) {
-		s->sg_handle = pci_map_single(itv->pdev, s->sg_dma, sizeof(struct ivtv_sg_element), s->dma);
+		s->sg_handle = pci_map_single(itv->pdev, s->sg_dma,
+				sizeof(struct ivtv_sg_element), PCI_DMA_TODEVICE);
 		ivtv_stream_sync_for_cpu(s);
 	}