au1200fb: don't use DMA_ATTR_NON_CONSISTENT

au1200fb allocates DMA memory using DMA_ATTR_NON_CONSISTENT, but never
calls dma_cache_sync to synchronize the memory between the CPU and the
device. If it was use on a not cache coherent bus that would be fatal,
but as far as I can tell from the naming and the mips platform
implementation it always is used in cache coherent systems. Remove
the DMA_ATTR_NON_CONSISTENT flag, which is a no-op in that case.

Signed-off-by: Christoph Hellwig <[e-mail]>
Acked-by: Manuel Lauss <[e-mail]>
Signed-off-by: Bartlomiej Zolnierkiewicz <[e-mail]>
Link: https://patchwork.freedesktop.org/patch/msgid/[e-mail]

drivers/video/fbdev/au1200fb.c

···
 	struct au1200fb_device *fbdev = info->par;
 
 	return dma_mmap_attrs(fbdev->dev, vma, fbdev->fb_mem, fbdev->fb_phys,
-			fbdev->fb_len, DMA_ATTR_NON_CONSISTENT);
+			fbdev->fb_len, 0);
 }
 
 static void set_global(u_int cmd, struct au1200_lcd_global_regs_t *pdata)
···
 
 		fbdev->fb_mem = dmam_alloc_attrs(&dev->dev,
 				PAGE_ALIGN(fbdev->fb_len),
-				&fbdev->fb_phys, GFP_KERNEL,
-				DMA_ATTR_NON_CONSISTENT);
+				&fbdev->fb_phys, GFP_KERNEL, 0);
 		if (!fbdev->fb_mem) {
 			print_err("fail to allocate framebuffer (size: %dK))",
 				  fbdev->fb_len / 1024);