drm/etnaviv: simplify unbind checks

Remember if the GPU has been sucessfully initialized. Only in that case
do we need to clean up various structures in the unbind path. If the
GPU hasn't been sucessfully initialized all the cleanups should happen
in the failure paths of the init function.
Signed-off-by: Lucas Stach <l.stach@pengutronix.de>
Reviewed-by: Philipp Zabel <p.zabel@pengutronix.de>
Reviewed-by: Guido Günther <agx@sigxcpu.org>

drivers/gpu/drm/etnaviv/etnaviv_gpu.c

@@ -799,17 +799,16 @@ int etnaviv_gpu_init(struct etnaviv_gpu *gpu)
 	pm_runtime_mark_last_busy(gpu->dev);
 	pm_runtime_put_autosuspend(gpu->dev);
 
+	gpu->initialized = true;
+
 	return 0;
 
 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;
 fail:
 	pm_runtime_mark_last_busy(gpu->dev);
 	pm_runtime_put_autosuspend(gpu->dev);
@@ -1521,7 +1520,7 @@ int etnaviv_gpu_wait_idle(struct etnaviv_gpu *gpu, unsigned int timeout_ms)
 
 static int etnaviv_gpu_hw_suspend(struct etnaviv_gpu *gpu)
 {
-	if (gpu->buffer.suballoc) {
+	if (gpu->initialized) {
 		/* Replace the last WAIT with END */
 		mutex_lock(&gpu->lock);
 		etnaviv_buffer_end(gpu);
@@ -1680,17 +1679,11 @@ static void etnaviv_gpu_unbind(struct device *dev, struct device *master,
 	etnaviv_gpu_hw_suspend(gpu);
 #endif
 
-	if (gpu->buffer.suballoc)
+	if (gpu->initialized) {
 		etnaviv_cmdbuf_free(&gpu->buffer);
-
-	if (gpu->cmdbuf_suballoc) {
 		etnaviv_cmdbuf_suballoc_destroy(gpu->cmdbuf_suballoc);
-		gpu->cmdbuf_suballoc = NULL;
-	}
-
-	if (gpu->mmu) {
 		etnaviv_iommu_destroy(gpu->mmu);
-		gpu->mmu = NULL;
+		gpu->initialized = false;
 	}
 
 	gpu->drm = NULL;
@@ -1827,7 +1820,7 @@ static int etnaviv_gpu_rpm_resume(struct device *dev)
 		return ret;
 
 	/* Re-initialise the basic hardware state */
-	if (gpu->drm && gpu->buffer.suballoc) {
+	if (gpu->drm && gpu->initialized) {
 		ret = etnaviv_gpu_hw_resume(gpu);
 		if (ret) {
 			etnaviv_gpu_clk_disable(gpu);

drivers/gpu/drm/etnaviv/etnaviv_gpu.h

@@ -99,6 +99,7 @@ struct etnaviv_gpu {
 	enum etnaviv_sec_mode sec_mode;
 	struct workqueue_struct *wq;
 	struct drm_gpu_scheduler sched;
+	bool initialized;
 
 	/* 'ring'-buffer: */
 	struct etnaviv_cmdbuf buffer;