drm/etnaviv: Fix missing mutex_destroy()

Currently, the calling of mutex_destroy() is ignored on error handling
code path. It is safe for now, since mutex_destroy() actually does
nothing in non-debug builds. But the mutex_destroy() is used to mark
the mutex uninitialized on debug builds, and any subsequent use of the
mutex is forbidden.

It also could lead to problems if mutex_destroy() gets extended, add
missing mutex_destroy() to eliminate potential concerns.

Reviewed-by: Christian Gmeiner <cgmeiner@igalia.com>
Signed-off-by: Sui Jingfeng <sui.jingfeng@linux.dev>
Signed-off-by: Lucas Stach <l.stach@pengutronix.de>

drivers/gpu/drm/etnaviv/etnaviv_cmdbuf.c

@@ -55,6 +55,7 @@ etnaviv_cmdbuf_suballoc_new(struct device *dev)
 	return suballoc;
 
 free_suballoc:
+	mutex_destroy(&suballoc->lock);
 	kfree(suballoc);
 
 	return ERR_PTR(ret);
@@ -79,6 +80,7 @@ void etnaviv_cmdbuf_suballoc_destroy(struct etnaviv_cmdbuf_suballoc *suballoc)
 {
 	dma_free_wc(suballoc->dev, SUBALLOC_SIZE, suballoc->vaddr,
 		    suballoc->paddr);
+	mutex_destroy(&suballoc->lock);
 	kfree(suballoc);
 }
 

drivers/gpu/drm/etnaviv/etnaviv_drv.c

@@ -574,6 +574,7 @@ static int etnaviv_bind(struct device *dev)
 out_destroy_suballoc:
 	etnaviv_cmdbuf_suballoc_destroy(priv->cmdbuf_suballoc);
 out_free_priv:
+	mutex_destroy(&priv->gem_lock);
 	kfree(priv);
 out_put:
 	drm_dev_put(drm);

drivers/gpu/drm/etnaviv/etnaviv_gem.c

@@ -514,6 +514,7 @@ void etnaviv_gem_free_object(struct drm_gem_object *obj)
 	etnaviv_obj->ops->release(etnaviv_obj);
 	drm_gem_object_release(obj);
 
+	mutex_destroy(&etnaviv_obj->lock);
 	kfree(etnaviv_obj);
 }
 

drivers/gpu/drm/etnaviv/etnaviv_gpu.c

@@ -1921,8 +1921,13 @@ static int etnaviv_gpu_platform_probe(struct platform_device *pdev)
 
 static void etnaviv_gpu_platform_remove(struct platform_device *pdev)
 {
+	struct etnaviv_gpu *gpu = dev_get_drvdata(&pdev->dev);
+
 	component_del(&pdev->dev, &gpu_ops);
 	pm_runtime_disable(&pdev->dev);
+
+	mutex_destroy(&gpu->lock);
+	mutex_destroy(&gpu->sched_lock);
 }
 
 static int etnaviv_gpu_rpm_suspend(struct device *dev)

drivers/gpu/drm/etnaviv/etnaviv_mmu.c

@@ -358,7 +358,7 @@ static void etnaviv_iommu_context_free(struct kref *kref)
 		container_of(kref, struct etnaviv_iommu_context, refcount);
 
 	etnaviv_cmdbuf_suballoc_unmap(context, &context->cmdbuf_mapping);
-
+	mutex_destroy(&context->lock);
 	context->global->ops->free(context);
 }
 void etnaviv_iommu_context_put(struct etnaviv_iommu_context *context)