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This patch resolves potential deadlock issue that can be incurred by changing file->f_op and filp->private_data to exynos specific mapper ops and gem object temporarily. To resolve this issue, this patch creates a new anon file dedicated to exynos specific mmaper, and making it used instead of existing one. Signed-off-by: Inki Dae <inki.dae@samsung.com> Signed-off-by: Kyungmin Park <kyungmin.park@samsung.com>