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 <hch@lst.de>
Acked-by: Manuel Lauss <manuel.lauss@gmail.com>
Signed-off-by: Bartlomiej Zolnierkiewicz <b.zolnierkie@samsung.com>
Link: https://patchwork.freedesktop.org/patch/msgid/20190625121321.10197-1-hch@lst.de

diff --git a/drivers/video/fbdev/au1200fb.c b/drivers/video/fbdev/au1200fb.c
index 26caffb..265d3b4 100644 (file)
--- a/drivers/video/fbdev/au1200fb.c
+++ b/drivers/video/fbdev/au1200fb.c
@@ -1234,7 +1234,7 @@ static int au1200fb_fb_mmap(struct fb_info *info, struct vm_area_struct *vma)
        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)
@@ -1692,8 +1692,7 @@ static int au1200fb_drv_probe(struct platform_device *dev)
 
                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);