891c47b17e3fd2d734e4fb50ff68b18a4fc7c0a4

Allow concurrent calls to unmap buffer by reducing the mutex lock duration, and allow same fd for mapping user iova, use book keeping for user smmu. CRs-Fixed: 2559879 Change-Id: Ic3c92d4fa0ca7d1c29e621172e0b058420e1501d Signed-off-by: Haibin Liu <haibinl@codeaurora.org>
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