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drm/xen: Add missing VM_DONTEXPAND flag in mmap callback

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With Xen PV Display driver in use the "expected" VM_DONTEXPAND flag
is not set (neither explicitly nor implicitly), so the driver hits
the code path in drm_gem_mmap_obj() which triggers the WARNING.

Signed-off-by: Oleksandr Tyshchenko <oleksandr_tyshchenko@epam.com>
Reviewed-by: Oleksandr Andrushchenko <oleksandr_andrushchenko@epam.com>
Link: https://lore.kernel.org/r/1652104303-5098-1-git-send-email-olekstysh@gmail.com
Signed-off-by: Juergen Gross <jgross@suse.com>
This commit is contained in:
Oleksandr Tyshchenko 2022-05-09 16:51:43 +03:00 committed by Juergen Gross
parent ecb6237fa3
commit ca6969013d
1 changed files with 1 additions and 1 deletions
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2
drivers/gpu/drm/xen/xen_drm_front_gem.c
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@ -71,7 +71,7 @@ static int xen_drm_front_gem_object_mmap(struct drm_gem_object *gem_obj,
* the whole buffer.
*/
vma->vm_flags &= ~VM_PFNMAP;
vma->vm_flags |= VM_MIXEDMAP;
vma->vm_flags |= VM_MIXEDMAP | VM_DONTEXPAND;
vma->vm_pgoff = 0;
/*