Lucas Stach 58f804da14 drm/etnaviv: check for reaped mapping in etnaviv_iommu_unmap_gem
commit e168c25526cd0368af098095c2ded4a008007e1b upstream.

When the mapping is already reaped the unmap must be a no-op, as we
would otherwise try to remove the mapping twice, corrupting the involved
data structures.

Cc: stable@vger.kernel.org # 5.4
Signed-off-by: Lucas Stach <l.stach@pengutronix.de>
Reviewed-by: Philipp Zabel <p.zabel@pengutronix.de>
Tested-by: Guido Günther <agx@sigxcpu.org>
Acked-by: Guido Günther <agx@sigxcpu.org>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
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Please follow buildroot tips to startup T-HEAD C9xx CPU's boards: T-HEAD buildroot

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