drm/vboxvideo: use managed pci functions

Allows us to drop the cleanup code on the floor.

Sam noticed in his review:
> With this change we avoid calling pci_disable_device()
> twise in case vbox_mm_init() fails.
> Once in vbox_hw_fini() and once in the error path.

v2: Include Sam's review remarks

v3: Fix typo in commit summary (Thomas Zimmermann)
Acked-by: Sam Ravnborg <sam@ravnborg.org>
Reviewed-by: Hans de Goede <hdegoede@redhat.com>
Signed-off-by: Daniel Vetter <daniel.vetter@intel.com>
Cc: Hans de Goede <hdegoede@redhat.com>
Link: https://patchwork.freedesktop.org/patch/msgid/20200415074034.175360-6-daniel.vetter@ffwll.ch

drivers/gpu/drm/vboxvideo/vbox_drv.c

@@ -55,13 +55,13 @@ static int vbox_pci_probe(struct pci_dev *pdev, const struct pci_device_id *ent)
 	pci_set_drvdata(pdev, vbox);
 	mutex_init(&vbox->hw_mutex);
 
-	ret = pci_enable_device(pdev);
+	ret = pcim_enable_device(pdev);
 	if (ret)
 		return ret;
 
 	ret = vbox_hw_init(vbox);
 	if (ret)
-		goto err_pci_disable;
+		return ret;
 
 	ret = vbox_mm_init(vbox);
 	if (ret)
@@ -91,8 +91,6 @@ static int vbox_pci_probe(struct pci_dev *pdev, const struct pci_device_id *ent)
 	vbox_mm_fini(vbox);
 err_hw_fini:
 	vbox_hw_fini(vbox);
-err_pci_disable:
-	pci_disable_device(pdev);
 	return ret;
 }
 

drivers/gpu/drm/vboxvideo/vbox_main.c

@@ -71,8 +71,6 @@ static void vbox_accel_fini(struct vbox_private *vbox)
 
 	for (i = 0; i < vbox->num_crtcs; ++i)
 		vbva_disable(&vbox->vbva_info[i], vbox->guest_pool, i);
-
-	pci_iounmap(vbox->ddev.pdev, vbox->vbva_buffers);
 }
 
 /* Do we support the 4.3 plus mode hint reporting interface? */
@@ -125,7 +123,7 @@ int vbox_hw_init(struct vbox_private *vbox)
 	/* Create guest-heap mem-pool use 2^4 = 16 byte chunks */
 	vbox->guest_pool = gen_pool_create(4, -1);
 	if (!vbox->guest_pool)
-		goto err_unmap_guest_heap;
+		return -ENOMEM;
 
 	ret = gen_pool_add_virt(vbox->guest_pool,
 				(unsigned long)vbox->guest_heap,
@@ -168,8 +166,6 @@ int vbox_hw_init(struct vbox_private *vbox)
 
 err_destroy_guest_pool:
 	gen_pool_destroy(vbox->guest_pool);
-err_unmap_guest_heap:
-	pci_iounmap(vbox->ddev.pdev, vbox->guest_heap);
 	return ret;
 }
 
@@ -177,5 +173,4 @@ void vbox_hw_fini(struct vbox_private *vbox)
 {
 	vbox_accel_fini(vbox);
 	gen_pool_destroy(vbox->guest_pool);
-	pci_iounmap(vbox->ddev.pdev, vbox->guest_heap);
 }