HID: lg4ff: Remove sysfs iface before deallocating memory

This patch fixes a possible race condition caused by the sysfs
interface being removed after the memory used by the interface
was already kfree'd.

Signed-off-by: Michal Malý <madcatsxter@gmail.com>
Signed-off-by: Jiri Kosina <jkosina@suse.cz>

drivers/hid/hid-lg.h

@@ -1,8 +1,6 @@
 #ifndef __HID_LG_H
 #define __HID_LG_H
 
-#include <linux/spinlock.h>
-
 struct lg_drv_data {
 	unsigned long quirks;
 	void *device_props;	/* Device specific properties */

drivers/hid/hid-lg4ff.c

@@ -466,6 +466,9 @@ int lg4ff_deinit(struct hid_device *hid)
 	bool found = 0;
 	struct lg4ff_device_entry *entry;
 	struct list_head *h, *g;
+
+	device_remove_file(&hid->dev, &dev_attr_range);
+
 	list_for_each_safe(h, g, &device_list.list) {
 		entry = list_entry(h, struct lg4ff_device_entry, list);
 		if (strcmp(entry->device_id, (&hid->dev)->kobj.name) == 0) {
@@ -478,11 +481,10 @@ int lg4ff_deinit(struct hid_device *hid)
 	}
 
 	if (!found) {
-		dbg_hid("Device entry not found!\n");
+		hid_err(hid, "Device entry not found!\n");
 		return -1;
 	}
 
-	device_remove_file(&hid->dev, &dev_attr_range);
 	dbg_hid("Device successfully unregistered\n");
 	return 0;
 }