From: Lucas Stach <l.stach@pengutronix.de>
Date: Mon, 23 Jul 2018 14:27:23 +0200
Subject: drm/etnaviv: fix crash in GPU suspend when init failed due to buffer
 placement
Git-commit: 5b147465532365dc4e2fee8499d6ca1f52dd0d16
Patch-mainline: v4.19-rc1
References: FATE#326289 FATE#326079 FATE#326049 FATE#322398 FATE#326166

When the suballocator was unable to provide a suitable buffer for the MMUv1
linear window, we roll back the GPU initialization. As the GPU is runtime
resumed at that point we need to clear the kernel cmdbuf suballoc entry to
properly skip any attempt to manipulate the cmdbuf when the GPU gets shut
down in the runtime suspend later on.

Signed-off-by: Lucas Stach <l.stach@pengutronix.de>
Acked-by: Petr Tesarik <ptesarik@suse.com>
---
 drivers/gpu/drm/etnaviv/etnaviv_gpu.c |    1 +
 1 file changed, 1 insertion(+)

--- a/drivers/gpu/drm/etnaviv/etnaviv_gpu.c
+++ b/drivers/gpu/drm/etnaviv/etnaviv_gpu.c
@@ -799,6 +799,7 @@ int etnaviv_gpu_init(struct etnaviv_gpu
 
 free_buffer:
 	etnaviv_cmdbuf_free(&gpu->buffer);
+	gpu->buffer.suballoc = NULL;
 destroy_iommu:
 	etnaviv_iommu_destroy(gpu->mmu);
 	gpu->mmu = NULL;