USB: usblp: 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.

Cc: Pete Zaitcev <zaitcev@redhat.com>
Link: https://lore.kernel.org/r/20190806144502.17792-6-gregkh@linuxfoundation.org
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

diff --git a/drivers/usb/class/usblp.c b/drivers/usb/class/usblp.c
index 407a7a6..7fea499 100644 (file)
--- a/drivers/usb/class/usblp.c
+++ b/drivers/usb/class/usblp.c
@@ -1082,6 +1082,12 @@ static ssize_t ieee1284_id_show(struct device *dev, struct device_attribute *att
 
 static DEVICE_ATTR_RO(ieee1284_id);
 
+static struct attribute *usblp_attrs[] = {
+       &dev_attr_ieee1284_id.attr,
+       NULL,
+};
+ATTRIBUTE_GROUPS(usblp);
+
 static int usblp_probe(struct usb_interface *intf,
                       const struct usb_device_id *id)
 {
@@ -1156,9 +1162,6 @@ static int usblp_probe(struct usb_interface *intf,
 
        /* Retrieve and store the device ID string. */
        usblp_cache_device_id_string(usblp);
-       retval = device_create_file(&intf->dev, &dev_attr_ieee1284_id);
-       if (retval)
-               goto abort_intfdata;
 
 #ifdef DEBUG
        usblp_check_status(usblp, 0);
@@ -1189,7 +1192,6 @@ static int usblp_probe(struct usb_interface *intf,
 
 abort_intfdata:
        usb_set_intfdata(intf, NULL);
-       device_remove_file(&intf->dev, &dev_attr_ieee1284_id);
 abort:
        kfree(usblp->readbuf);
        kfree(usblp->statusbuf);
@@ -1360,8 +1362,6 @@ static void usblp_disconnect(struct usb_interface *intf)
                BUG();
        }
 
-       device_remove_file(&intf->dev, &dev_attr_ieee1284_id);
-
        mutex_lock(&usblp_mutex);
        mutex_lock(&usblp->mut);
        usblp->present = 0;
@@ -1421,6 +1421,7 @@ static struct usb_driver usblp_driver = {
        .suspend =      usblp_suspend,
        .resume =       usblp_resume,
        .id_table =     usblp_ids,
+       .dev_groups =   usblp_groups,
        .supports_autosuspend = 1,
 };