uio/uio_pci_generic: use device-managed function equivalents

This driver can be easily converted to use the device-managed allocator
function and the PCI managed enable function.

With these conversions the probe error paths are no longer needed and
neither is the remove function.
Signed-off-by: Alexandru Ardelean <alexandru.ardelean@analog.com>
Link: https://lore.kernel.org/r/20201111113828.64992-1-alexandru.ardelean@analog.comSigned-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

drivers/uio/uio_pci_generic.c

@@ -74,23 +74,19 @@ static int probe(struct pci_dev *pdev,
 	struct uio_pci_generic_dev *gdev;
 	int err;
 
-	err = pci_enable_device(pdev);
+	err = pcim_enable_device(pdev);
 	if (err) {
 		dev_err(&pdev->dev, "%s: pci_enable_device failed: %d\n",
 			__func__, err);
 		return err;
 	}
 
-	if (pdev->irq && !pci_intx_mask_supported(pdev)) {
-		err = -ENODEV;
-		goto err_verify;
-	}
+	if (pdev->irq && !pci_intx_mask_supported(pdev))
+		return -ENOMEM;
 
-	gdev = kzalloc(sizeof(struct uio_pci_generic_dev), GFP_KERNEL);
-	if (!gdev) {
-		err = -ENOMEM;
-		goto err_alloc;
-	}
+	gdev = devm_kzalloc(&pdev->dev, sizeof(struct uio_pci_generic_dev), GFP_KERNEL);
+	if (!gdev)
+		return -ENOMEM;
 
 	gdev->info.name = "uio_pci_generic";
 	gdev->info.version = DRIVER_VERSION;
@@ -105,34 +101,19 @@ static int probe(struct pci_dev *pdev,
 			 "no support for interrupts?\n");
 	}
 
-	err = uio_register_device(&pdev->dev, &gdev->info);
+	err = devm_uio_register_device(&pdev->dev, &gdev->info);
 	if (err)
-		goto err_register;
+		return err;
+
 	pci_set_drvdata(pdev, gdev);
 
 	return 0;
-err_register:
-	kfree(gdev);
-err_alloc:
-err_verify:
-	pci_disable_device(pdev);
-	return err;
-}
-
-static void remove(struct pci_dev *pdev)
-{
-	struct uio_pci_generic_dev *gdev = pci_get_drvdata(pdev);
-
-	uio_unregister_device(&gdev->info);
-	pci_disable_device(pdev);
-	kfree(gdev);
 }
 
 static struct pci_driver uio_pci_driver = {
 	.name = "uio_pci_generic",
 	.id_table = NULL, /* only dynamic id's */
 	.probe = probe,
-	.remove = remove,
 };
 
 module_pci_driver(uio_pci_driver);