[Bug 111541] Cursor sprite sometimes not showed since linux 5.2

[bugzilla-daemon at freedesktop.org]

https://bugs.freedesktop.org/show_bug.cgi?id=111541

--- Comment #25 from Mikko Rapeli <mikko.rapeli at iki.fi> ---
The patch doesn't seem to apply to 5.2 stable tree, so I tried to backport it
like this. I hope this is correct.

--- a/drivers/gpu/drm/i915/i915_gem.c
+++ b/drivers/gpu/drm/i915/i915_gem.c
@@ -1908,7 +1908,11 @@ vm_fault_t i915_gem_fault(struct vm_fault *vmf)
                list_add(&obj->userfault_link, &dev_priv->mm.userfault_list);
        GEM_BUG_ON(!obj->userfault_count);

-       i915_vma_set_ggtt_write(vma);
+       if (write) {
+               GEM_BUG_ON(!i915_gem_object_has_pinned_pages(obj));
+               i915_vma_set_ggtt_write(vma);
+               obj->mm.dirty = true;
+       }

 err_fence:
        i915_vma_unpin_fence(vma);

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