Re: linux-next: build failure after merge of the drm-intel tree

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On 05/08/2018 04:07 AM, Stephen Rothwell wrote:
Hi all,

After merging the drm-intel tree, today's linux-next build (x86_64
allmodconfig) failed like this:

drivers/gpu/drm/xen/xen_drm_front.c: In function 'xen_drv_probe':
drivers/gpu/drm/xen/xen_drm_front.c:740:10: error: 'struct bus_type' has no member named 'force_dma'
   dev->bus->force_dma = true;
           ^~
drivers/gpu/drm/xen/xen_drm_front.c:742:8: error: too few arguments to function 'of_dma_configure'
   ret = of_dma_configure(dev, NULL);
         ^~~~~~~~~~~~~~~~
In file included from drivers/gpu/drm/xen/xen_drm_front.c:16:0:
include/linux/of_device.h:58:5: note: declared here
  int of_dma_configure(struct device *dev,
      ^~~~~~~~~~~~~~~~

Caused by commit

   c575b7eeb89f ("drm/xen-front: Add support for Xen PV display frontend")

interacting with commit

   3d6ce86ee794 ("drivers: remove force dma flag from buses")

from the dma-mapping tree.

I have added the following merge fix patch:

From: Stephen Rothwell <sfr@xxxxxxxxxxxxxxxx>
Date: Tue, 8 May 2018 11:02:24 +1000
Subject: [PATCH] drm/xen-front: merge fix for "drivers: remove force dma flag from buses"

Signed-off-by: Stephen Rothwell <sfr@xxxxxxxxxxxxxxxx>
Thank you,
Reviewed-by: Oleksandr Andrushchenko <oleksandr_andrushchenko@xxxxxxxx>
---
  drivers/gpu/drm/xen/xen_drm_front.c | 3 +--
  1 file changed, 1 insertion(+), 2 deletions(-)

diff --git a/drivers/gpu/drm/xen/xen_drm_front.c b/drivers/gpu/drm/xen/xen_drm_front.c
index 1b0ea9ac330e..0e486cb1c10c 100644
--- a/drivers/gpu/drm/xen/xen_drm_front.c
+++ b/drivers/gpu/drm/xen/xen_drm_front.c
@@ -737,9 +737,8 @@ static int xen_drv_probe(struct xenbus_device *xb_dev,
  	 * is not correct: to fix this call of_dma_configure() with a NULL
  	 * node to set default DMA ops.
  	 */
-	dev->bus->force_dma = true;
  	dev->coherent_dma_mask = DMA_BIT_MASK(32);
-	ret = of_dma_configure(dev, NULL);
+	ret = of_dma_configure(dev, NULL, true);
  	if (ret < 0) {
  		DRM_ERROR("Cannot setup DMA ops, ret %d", ret);
  		return ret;


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