virt: vbox: convert to use dev_groups

The driver core supports the ability to handle the creation and removal
of device-specific sysfs files in a race-free manner. Moreover, it can
guarantee the success of creation. Therefore, it should be better to
convert to use dev_groups.

Fixes: 0ba002bc ("virt: Add vboxguest driver for Virtual Box Guest integration")
Reviewed-by: Hans de Goede <hdegoede@redhat.com>
Signed-off-by: Jiasheng Jiang <jiasheng@iscas.ac.cn>
Link: https://lore.kernel.org/r/20220901144610.3550300-1-jiasheng@iscas.ac.cnSigned-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

drivers/virt/vboxguest/vboxguest_linux.c

@@ -270,6 +270,13 @@ static ssize_t host_features_show(struct device *dev,
 static DEVICE_ATTR_RO(host_version);
 static DEVICE_ATTR_RO(host_features);
 
+static struct attribute *vbg_pci_attrs[] = {
+	&dev_attr_host_version.attr,
+	&dev_attr_host_features.attr,
+	NULL,
+};
+ATTRIBUTE_GROUPS(vbg_pci);
+
 /**
  * Does the PCI detection and init of the device.
  *
@@ -390,8 +397,6 @@ static int vbg_pci_probe(struct pci_dev *pci, const struct pci_device_id *id)
 	}
 
 	pci_set_drvdata(pci, gdev);
-	device_create_file(dev, &dev_attr_host_version);
-	device_create_file(dev, &dev_attr_host_features);
 
 	vbg_info("vboxguest: misc device minor %d, IRQ %d, I/O port %x, MMIO at %pap (size %pap)\n",
 		 gdev->misc_device.minor, pci->irq, gdev->io_port,
@@ -422,8 +427,6 @@ static void vbg_pci_remove(struct pci_dev *pci)
 	mutex_unlock(&vbg_gdev_mutex);
 
 	free_irq(pci->irq, gdev);
-	device_remove_file(gdev->dev, &dev_attr_host_features);
-	device_remove_file(gdev->dev, &dev_attr_host_version);
 	misc_deregister(&gdev->misc_device_user);
 	misc_deregister(&gdev->misc_device);
 	vbg_core_exit(gdev);
@@ -488,6 +491,7 @@ MODULE_DEVICE_TABLE(pci,  vbg_pci_ids);
 
 static struct pci_driver vbg_pci_driver = {
 	.name		= DEVICE_NAME,
+	.dev_groups	= vbg_pci_groups,
 	.id_table	= vbg_pci_ids,
 	.probe		= vbg_pci_probe,
 	.remove		= vbg_pci_remove,