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drm/etnaviv: fix MMU context leak on GPU reset
commit f978a53 upstream. After a reset the GPU is no longer using the MMU context and may be restarted with a different context. While the mmu_state proeprly was cleared, the context wasn't unreferenced, leading to a memory leak. Cc: stable@vger.kernel.org # 5.4 Reported-by: Michael Walle <michael@walle.cc> Signed-off-by: Lucas Stach <l.stach@pengutronix.de> Tested-by: Michael Walle <michael@walle.cc> Tested-by: Marek Vasut <marex@denx.de> Reviewed-by: Christian Gmeiner <christian.gmeiner@gmail.com> Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
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