dma_map_single does not work for vmalloc-ed buffers,
so disable DMA in this case.
Signed-off-by: NLadislav Michl <ladis@linux-mips.org>
Reported-by: N"H. Nikolaus Schaller" <hns@goldelico.com>
Tested-by: N"H. Nikolaus Schaller" <hns@goldelico.com>
Reviewed-by: NPeter Ujfalusi <peter.ujfalusi@ti.com>
Signed-off-by: NBoris Brezillon <boris.brezillon@bootlin.com>