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    Subject[PATCH 4.19 002/101] drm/i915/gvt: do not let pin count of shadow mm go negative
    Date
    [ Upstream commit 663a50ceac75c2208d2ad95365bc8382fd42f44d ]

    shadow mm's pin count got increased in workload preparation phase, which
    is after workload scanning.
    it will get decreased in complete_current_workload() anyway after
    workload completion.
    Sometimes, if a workload meets a scanning error, its shadow mm pin count
    will not get increased but will get decreased in the end.
    This patch lets shadow mm's pin count not go below 0.

    Fixes: 2707e4446688 ("drm/i915/gvt: vGPU graphics memory virtualization")
    Cc: zhenyuw@linux.intel.com
    Cc: stable@vger.kernel.org #4.14+
    Signed-off-by: Yan Zhao <yan.y.zhao@intel.com>
    Signed-off-by: Zhenyu Wang <zhenyuw@linux.intel.com>
    Signed-off-by: Sasha Levin <sashal@kernel.org>
    ---
    drivers/gpu/drm/i915/gvt/gtt.c | 2 +-
    1 file changed, 1 insertion(+), 1 deletion(-)

    diff --git a/drivers/gpu/drm/i915/gvt/gtt.c b/drivers/gpu/drm/i915/gvt/gtt.c
    index 00aad8164dec..542f31ce108f 100644
    --- a/drivers/gpu/drm/i915/gvt/gtt.c
    +++ b/drivers/gpu/drm/i915/gvt/gtt.c
    @@ -1940,7 +1940,7 @@ void _intel_vgpu_mm_release(struct kref *mm_ref)
    */
    void intel_vgpu_unpin_mm(struct intel_vgpu_mm *mm)
    {
    - atomic_dec(&mm->pincount);
    + atomic_dec_if_positive(&mm->pincount);
    }

    /**
    --
    2.19.1


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