base: soc: siplify ida usage

Simplify ida index allocation and removal by
using the ida_simple_* helper functions

Signed-off-by: Lee Duncan <lduncan@suse.com>
Reviewed-by: Johannes Thumshirn <jthumshirn@suse.de>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

drivers/base/soc.c

@@ -16,7 +16,6 @@
 #include <linux/err.h>
 
 static DEFINE_IDA(soc_ida);
-static DEFINE_SPINLOCK(soc_lock);
 
 static ssize_t soc_info_get(struct device *dev,
 			    struct device_attribute *attr,
@@ -122,20 +121,10 @@ struct soc_device *soc_device_register(struct soc_device_attribute *soc_dev_attr
 	}
 
 	/* Fetch a unique (reclaimable) SOC ID. */
-	do {
-		if (!ida_pre_get(&soc_ida, GFP_KERNEL)) {
-			ret = -ENOMEM;
-			goto out2;
-		}
-
-		spin_lock(&soc_lock);
-		ret = ida_get_new(&soc_ida, &soc_dev->soc_dev_num);
-		spin_unlock(&soc_lock);
-
-	} while (ret == -EAGAIN);
-
-	if (ret)
+	ret = ida_simple_get(&soc_ida, 0, 0, GFP_KERNEL);
+	if (ret < 0)
 		goto out2;
+	soc_dev->soc_dev_num = ret;
 
 	soc_dev->attr = soc_dev_attr;
 	soc_dev->dev.bus = &soc_bus_type;
@@ -151,7 +140,7 @@ struct soc_device *soc_device_register(struct soc_device_attribute *soc_dev_attr
 	return soc_dev;
 
 out3:
-	ida_remove(&soc_ida, soc_dev->soc_dev_num);
+	ida_simple_remove(&soc_ida, soc_dev->soc_dev_num);
 out2:
 	kfree(soc_dev);
 out1:
@@ -161,7 +150,7 @@ out1:
 /* Ensure soc_dev->attr is freed prior to calling soc_device_unregister. */
 void soc_device_unregister(struct soc_device *soc_dev)
 {
-	ida_remove(&soc_ida, soc_dev->soc_dev_num);
+	ida_simple_remove(&soc_ida, soc_dev->soc_dev_num);
 
 	device_unregister(&soc_dev->dev);
 }