Revert "drm/msm: Fix failure paths in msm_drm_init()"

This reverts commit 86365003.

A recent commit tried to address a drm device leak in the early
msm_drm_uninit() error paths but ended up making things worse.

Specifically, it moved the drm device reference put in msm_drm_uninit()
to msm_drm_init() which means that the drm would now be leaked on normal
unbind.

For reasons that were never spelled out, it also added kms NULL pointer
checks to a couple of helper functions that had nothing to do with the
paths modified by the patch.

Instead of trying to salvage this incrementally, let's revert the bad
commit so that clean and backportable fixes can be added in its place.

Fixes: 86365003 ("drm/msm: Fix failure paths in msm_drm_init()")
Cc: Akhil P Oommen <quic_akhilpo@quicinc.com>
Signed-off-by: Johan Hovold <johan+linaro@kernel.org>
Reviewed-by: Dmitry Baryshkov <dmitry.baryshkov@linaro.org>
Patchwork: https://patchwork.freedesktop.org/patch/525092/
Link: https://lore.kernel.org/r/20230306100722.28485-3-johan+linaro@kernel.orgSigned-off-by: Dmitry Baryshkov <dmitry.baryshkov@linaro.org>

drivers/gpu/drm/msm/disp/msm_disp_snapshot.c

@@ -129,9 +129,6 @@ void msm_disp_snapshot_destroy(struct drm_device *drm_dev)
 	}
 
 	priv = drm_dev->dev_private;
-	if (!priv->kms)
-		return;
-
 	kms = priv->kms;
 
 	if (kms->dump_worker)

drivers/gpu/drm/msm/msm_drv.c

@@ -151,9 +151,6 @@ static void msm_irq_uninstall(struct drm_device *dev)
 	struct msm_drm_private *priv = dev->dev_private;
 	struct msm_kms *kms = priv->kms;
 
-	if (!priv->kms)
-		return;
-
 	kms->funcs->irq_uninstall(kms);
 	if (kms->irq_requested)
 		free_irq(kms->irq, dev);
@@ -271,6 +268,8 @@ static int msm_drm_uninit(struct device *dev)
 	component_unbind_all(dev, ddev);
 
 	ddev->dev_private = NULL;
+	drm_dev_put(ddev);
+
 	destroy_workqueue(priv->wq);
 
 	return 0;
@@ -443,12 +442,12 @@ static int msm_drm_init(struct device *dev, const struct drm_driver *drv)
 
 	ret = msm_init_vram(ddev);
 	if (ret)
-		goto err_drm_dev_put;
+		return ret;
 
 	/* Bind all our sub-components: */
 	ret = component_bind_all(dev, ddev);
 	if (ret)
-		goto err_drm_dev_put;
+		return ret;
 
 	dma_set_max_seg_size(dev, UINT_MAX);
 
@@ -543,8 +542,6 @@ static int msm_drm_init(struct device *dev, const struct drm_driver *drv)
 
 err_msm_uninit:
 	msm_drm_uninit(dev);
-err_drm_dev_put:
-	drm_dev_put(ddev);
 	return ret;
 }