power: convert to idr_alloc()

Convert to the much saner new idr interface.

Signed-off-by: Tejun Heo <[e-mail]>
Acked-by: Anton Vorontsov <[e-mail]>
Cc: David Woodhouse <[e-mail]>
Signed-off-by: Andrew Morton <[e-mail]>
Signed-off-by: Linus Torvalds <[e-mail]>

drivers/power/bq2415x_charger.c

···
 	}
 
 	/* Get new ID for the new device */
-	ret = idr_pre_get(&bq2415x_id, GFP_KERNEL);
-	if (ret == 0)
-		return -ENOMEM;
-
 	mutex_lock(&bq2415x_id_mutex);
-	ret = idr_get_new(&bq2415x_id, client, &num);
+	num = idr_alloc(&bq2415x_id, client, 0, 0, GFP_KERNEL);
 	mutex_unlock(&bq2415x_id_mutex);
-
-	if (ret < 0)
-		return ret;
+	if (num < 0)
+		return num;
 
 	name = kasprintf(GFP_KERNEL, "%s-%d", id->name, num);
 	if (!name) {

drivers/power/bq27x00_battery.c

···
 	int retval = 0;
 
 	/* Get new ID for the new battery device */
-	retval = idr_pre_get(&battery_id, GFP_KERNEL);
-	if (retval == 0)
-		return -ENOMEM;
 	mutex_lock(&battery_mutex);
-	retval = idr_get_new(&battery_id, client, &num);
+	num = idr_alloc(&battery_id, client, 0, 0, GFP_KERNEL);
 	mutex_unlock(&battery_mutex);
-	if (retval < 0)
-		return retval;
+	if (num < 0)
+		return num;
 
 	name = kasprintf(GFP_KERNEL, "%s-%d", id->name, num);
 	if (!name) {

drivers/power/ds2782_battery.c

···
 	}
 
 	/* Get an ID for this battery */
-	ret = idr_pre_get(&battery_id, GFP_KERNEL);
-	if (ret == 0) {
-		ret = -ENOMEM;
-		goto fail_id;
-	}
-
 	mutex_lock(&battery_lock);
-	ret = idr_get_new(&battery_id, client, &num);
+	ret = idr_alloc(&battery_id, client, 0, 0, GFP_KERNEL);
 	mutex_unlock(&battery_lock);
 	if (ret < 0)
 		goto fail_id;
+	num = ret;
 
 	info = kzalloc(sizeof(*info), GFP_KERNEL);
 	if (!info) {