linux-kernel - [PATCH 5.1 77/96] drm/etnaviv: add missing failure path to destroy suballoc

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Date:   Mon,  8 Jul 2019 17:13:49 +0200
From:   Greg Kroah-Hartman <gregkh@...uxfoundation.org>
To:     linux-kernel@...r.kernel.org
Cc:     Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
        stable@...r.kernel.org, Lucas Stach <l.stach@...gutronix.de>,
        Russell King <rmk+kernel@...linux.org.uk>
Subject: [PATCH 5.1 77/96] drm/etnaviv: add missing failure path to destroy suballoc

From: Lucas Stach <l.stach@...gutronix.de>

commit be132e1375c1fffe48801296279079f8a59a9ed3 upstream.

When something goes wrong in the GPU init after the cmdbuf suballocator
has been constructed, we fail to destroy it properly. This causes havok
later when the GPU is unbound due to a module unload or similar.

Fixes: e66774dd6f6a (drm/etnaviv: add cmdbuf suballocator)
Signed-off-by: Lucas Stach <l.stach@...gutronix.de>
Tested-by: Russell King <rmk+kernel@...linux.org.uk>
Signed-off-by: Greg Kroah-Hartman <gregkh@...uxfoundation.org>

---
 drivers/gpu/drm/etnaviv/etnaviv_gpu.c |    7 +++++--
 1 file changed, 5 insertions(+), 2 deletions(-)

--- a/drivers/gpu/drm/etnaviv/etnaviv_gpu.c
+++ b/drivers/gpu/drm/etnaviv/etnaviv_gpu.c
@@ -762,7 +762,7 @@ int etnaviv_gpu_init(struct etnaviv_gpu
 	if (IS_ERR(gpu->cmdbuf_suballoc)) {
 		dev_err(gpu->dev, "Failed to create cmdbuf suballocator\n");
 		ret = PTR_ERR(gpu->cmdbuf_suballoc);
-		goto fail;
+		goto destroy_iommu;
 	}
 
 	/* Create buffer: */
@@ -770,7 +770,7 @@ int etnaviv_gpu_init(struct etnaviv_gpu
 				  PAGE_SIZE);
 	if (ret) {
 		dev_err(gpu->dev, "could not create command buffer\n");
-		goto destroy_iommu;
+		goto destroy_suballoc;
 	}
 
 	if (gpu->mmu->version == ETNAVIV_IOMMU_V1 &&
@@ -802,6 +802,9 @@ int etnaviv_gpu_init(struct etnaviv_gpu
 free_buffer:
 	etnaviv_cmdbuf_free(&gpu->buffer);
 	gpu->buffer.suballoc = NULL;
+destroy_suballoc:
+	etnaviv_cmdbuf_suballoc_destroy(gpu->cmdbuf_suballoc);
+	gpu->cmdbuf_suballoc = NULL;
 destroy_iommu:
 	etnaviv_iommu_destroy(gpu->mmu);
 	gpu->mmu = NULL;