drm/vmwgfx: Use non-hybrid PCI devres API

vmwgfx enables its PCI device with pcim_enable_device(). This,
implicitly, switches the function pci_request_regions() into managed
mode, where it becomes a devres function.

The PCI subsystem wants to remove this hybrid nature from its
interfaces. To do so, users of the aforementioned combination of
functions must be ported to non-hybrid functions.

Moreover, since both functions are already managed in this driver, the
calls to pci_release_regions() are unnecessary.

Remove the calls to pci_release_regions().

Replace the call to sometimes-managed pci_request_regions() with one to
always-managed pcim_request_all_regions().

Signed-off-by: Philipp Stanner <[e-mail]>
Reviewed-by: Zack Rusin <[e-mail]>
Signed-off-by: Zack Rusin <[e-mail]>
Link: https://lore.kernel.org/r/[e-mail]

drivers/gpu/drm/vmwgfx/vmwgfx_drv.c

···
 
 	pci_set_master(pdev);
 
-	ret = pci_request_regions(pdev, "vmwgfx probe");
+	ret = pcim_request_all_regions(pdev, "vmwgfx probe");
 	if (ret)
 		return ret;
 
···
 		if (!dev->rmmio) {
 			drm_err(&dev->drm,
 				"Failed mapping registers mmio memory.\n");
-			pci_release_regions(pdev);
 			return -ENOMEM;
 		}
 	} else if (pci_id == VMWGFX_PCI_ID_SVGA2) {
···
 		if (IS_ERR(dev->fifo_mem)) {
 			drm_err(&dev->drm,
 				  "Failed mapping FIFO memory.\n");
-			pci_release_regions(pdev);
 			return PTR_ERR(dev->fifo_mem);
 		}
 	} else {
-		pci_release_regions(pdev);
 		return -EINVAL;
 	}
 
···
 	int ret;
 	enum vmw_res_type i;
 	bool refuse_dma = false;
-	struct pci_dev *pdev = to_pci_dev(dev_priv->drm.dev);
 
 	vmw_sw_context_init(dev_priv);
 
···
 		return ret;
 	ret = vmw_detect_version(dev_priv);
 	if (ret)
-		goto out_no_pci_or_version;
+		return ret;
 
 
 	for (i = vmw_res_context; i < vmw_res_max; ++i) {
···
 
 	if (dev_priv->ctx.staged_bindings)
 		vmw_binding_state_free(dev_priv->ctx.staged_bindings);
-out_no_pci_or_version:
-	pci_release_regions(pdev);
+
 	return ret;
 }
 
 static void vmw_driver_unload(struct drm_device *dev)
 {
 	struct vmw_private *dev_priv = vmw_priv(dev);
-	struct pci_dev *pdev = to_pci_dev(dev->dev);
 	enum vmw_res_type i;
 
 	unregister_pm_notifier(&dev_priv->pm_nb);
···
 		idr_destroy(&dev_priv->res_idr[i]);
 
 	vmw_mksstat_remove_all(dev_priv);
-
-	pci_release_regions(pdev);
 }
 
 static void vmw_postclose(struct drm_device *dev,