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drm/i915/gvt: Don't try to unpin an empty page range 

Attempt to unpin pages in the error path of gvt_pin_guest_page() if and
only if at least one page was successfully pinned.  Unpinning doesn't
cause functional problems, but vfio_device_container_unpin_pages()
rightfully warns about being asked to unpin zero pages.

Signed-off-by: Yan Zhao <yan.y.zhao@intel.com>
[sean: write changelog]
Reviewed-by: Zhi Wang <zhi.a.wang@intel.com>
Link: https://lore.kernel.org/r/20230729013535.1070024-5-seanjc@google.com
Signed-off-by: Sean Christopherson <seanjc@google.com>
Signed-off-by: Paolo Bonzini <pbonzini@redhat.com>
This commit is contained in:
Yan Zhao 2023-07-28 18:35:10 -07:00 committed by Paolo Bonzini
parent adc7b226b7
commit a15e61f337
1 changed files with 2 additions and 1 deletions
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3
drivers/gpu/drm/i915/gvt/kvmgt.c
View File

@ -172,7 +172,8 @@ static int gvt_pin_guest_page(struct intel_vgpu *vgpu, unsigned long gfn,
*page = base_page;
return 0;
err:
gvt_unpin_guest_page(vgpu, gfn, npage * PAGE_SIZE);
if (npage)
gvt_unpin_guest_page(vgpu, gfn, npage * PAGE_SIZE);
return ret;
}