V4L/DVB (11141): em28xx: fix oops on ARM platform when allocating transfer buffers

Add missing URB_NO_TRANSFER_DMA_MAP flag, since	the use	of consistent memory
is not permitted for DMA on the ARM platform.

Thanks to Paul Thomas <pthomas8589@gmail.com> for providing sample ARM
hardware that was experiencing the oops (tested on the at91rm9200 based
LinuxStamp).

Thanks to David Brownell <david-b@pacbell.net> for providing insight into the
ARM memory architecture.
Signed-off-by: Devin Heitmueller <dheitmueller@linuxtv.org>
Signed-off-by: Mauro Carvalho Chehab <mchehab@redhat.com>

drivers/media/video/em28xx/em28xx-core.c

@@ -982,7 +982,7 @@ int em28xx_init_isoc(struct em28xx *dev, int max_packets,
 				 em28xx_irq_callback, dma_q, 1);
 
 		urb->number_of_packets = max_packets;
-		urb->transfer_flags = URB_ISO_ASAP;
+		urb->transfer_flags = URB_ISO_ASAP | URB_NO_TRANSFER_DMA_MAP;
 
 		k = 0;
 		for (j = 0; j < max_packets; j++) {