USB: cytherm: convert to use dev_groups

USB drivers now support the ability for the driver core to handle the
creation and removal of device-specific sysfs files in a race-free
manner.  Take advantage of that by converting the driver to use this by
moving the sysfs attributes into a group and assigning the dev_groups
pointer to it.

Link: https://lore.kernel.org/r/20190806144502.17792-9-gregkh@linuxfoundation.org
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

diff --git a/drivers/usb/misc/cytherm.c b/drivers/usb/misc/cytherm.c
index 8b15ab5..3e3802a 100644 (file)
--- a/drivers/usb/misc/cytherm.c
+++ b/drivers/usb/misc/cytherm.c
@@ -36,20 +36,6 @@ struct usb_cytherm {
 };
 
 
-/* local function prototypes */
-static int cytherm_probe(struct usb_interface *interface, 
-                        const struct usb_device_id *id);
-static void cytherm_disconnect(struct usb_interface *interface);
-
-
-/* usb specific object needed to register this driver with the usb subsystem */
-static struct usb_driver cytherm_driver = {
-       .name =         "cytherm",
-       .probe =        cytherm_probe,
-       .disconnect =   cytherm_disconnect,
-       .id_table =     id_table,
-};
-
 /* Vendor requests */
 /* They all operate on one byte at a time */
 #define PING       0x00
@@ -304,6 +290,15 @@ static ssize_t port1_store(struct device *dev, struct device_attribute *attr, co
 }
 static DEVICE_ATTR_RW(port1);
 
+static struct attribute *cytherm_attrs[] = {
+       &dev_attr_brightness.attr,
+       &dev_attr_temp.attr,
+       &dev_attr_button.attr,
+       &dev_attr_port0.attr,
+       &dev_attr_port1.attr,
+       NULL,
+};
+ATTRIBUTE_GROUPS(cytherm);
 
 static int cytherm_probe(struct usb_interface *interface, 
                         const struct usb_device_id *id)
@@ -322,34 +317,10 @@ static int cytherm_probe(struct usb_interface *interface,
 
        dev->brightness = 0xFF;
 
-       retval = device_create_file(&interface->dev, &dev_attr_brightness);
-       if (retval)
-               goto error;
-       retval = device_create_file(&interface->dev, &dev_attr_temp);
-       if (retval)
-               goto error;
-       retval = device_create_file(&interface->dev, &dev_attr_button);
-       if (retval)
-               goto error;
-       retval = device_create_file(&interface->dev, &dev_attr_port0);
-       if (retval)
-               goto error;
-       retval = device_create_file(&interface->dev, &dev_attr_port1);
-       if (retval)
-               goto error;
-
        dev_info (&interface->dev,
                  "Cypress thermometer device now attached\n");
        return 0;
-error:
-       device_remove_file(&interface->dev, &dev_attr_brightness);
-       device_remove_file(&interface->dev, &dev_attr_temp);
-       device_remove_file(&interface->dev, &dev_attr_button);
-       device_remove_file(&interface->dev, &dev_attr_port0);
-       device_remove_file(&interface->dev, &dev_attr_port1);
-       usb_set_intfdata (interface, NULL);
-       usb_put_dev(dev->udev);
-       kfree(dev);
+
 error_mem:
        return retval;
 }
@@ -360,12 +331,6 @@ static void cytherm_disconnect(struct usb_interface *interface)
 
        dev = usb_get_intfdata (interface);
 
-       device_remove_file(&interface->dev, &dev_attr_brightness);
-       device_remove_file(&interface->dev, &dev_attr_temp);
-       device_remove_file(&interface->dev, &dev_attr_button);
-       device_remove_file(&interface->dev, &dev_attr_port0);
-       device_remove_file(&interface->dev, &dev_attr_port1);
-
        /* first remove the files, then NULL the pointer */
        usb_set_intfdata (interface, NULL);
 
@@ -376,6 +341,15 @@ static void cytherm_disconnect(struct usb_interface *interface)
        dev_info(&interface->dev, "Cypress thermometer now disconnected\n");
 }
 
+/* usb specific object needed to register this driver with the usb subsystem */
+static struct usb_driver cytherm_driver = {
+       .name =         "cytherm",
+       .probe =        cytherm_probe,
+       .disconnect =   cytherm_disconnect,
+       .id_table =     id_table,
+       .dev_groups =   cytherm_groups,
+};
+
 module_usb_driver(cytherm_driver);
 
 MODULE_AUTHOR(DRIVER_AUTHOR);