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Subject[PATCH] drm: make sure page protections are updated after changing vm_flags.
Some architectures compute ->vm_page_prot depending on ->vm_flags, so
we need to update the protections after adjusting the flags.

Reported-by: Jan Beulich <>
Signed-off-by: Jeremy Fitzhardinge <>

diff --git a/drivers/gpu/drm/drm_gem.c b/drivers/gpu/drm/drm_gem.c
index 8104eca..9d3e39f 100644
--- a/drivers/gpu/drm/drm_gem.c
+++ b/drivers/gpu/drm/drm_gem.c
@@ -537,7 +537,7 @@ int drm_gem_mmap(struct file *filp, struct vm_area_struct *vma)
vma->vm_ops = obj->dev->driver->gem_vm_ops;
vma->vm_private_data = map->handle;
/* FIXME: use pgprot_writecombine when available */
- vma->vm_page_prot = pgprot_writecombine(vma->vm_page_prot);
+ vma->vm_page_prot = pgprot_writecombine(vm_get_page_prot(vma->vm_flags));

/* Take a ref for this mapping of the object, so that the fault
* handler can dereference the mmap offset's pointer to the object.

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