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

From: Stephen Rothwell <[email-masked]>
Date: Wed, 9 May 2018 15:02:55 +1000

Hi all,

On Tue, 8 May 2018 11:07:16 +1000 Stephen Rothwell <[email-masked]> wrote:
>
> 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 <[email-masked]>
> 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 <[email-masked]>
> ---
>  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;
> -- 
> 2.17.0

This is now needed for the merge of the drm and dma-mapping trees.
-- 
Cheers,
Stephen Rothwell
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