diff --git a/drivers/rpmsg/rpmsg_char.c b/drivers/rpmsg/rpmsg_char.c
index 09833ad..1cb8d74 100644
--- a/drivers/rpmsg/rpmsg_char.c
+++ b/drivers/rpmsg/rpmsg_char.c
@@ -399,8 +399,8 @@
 {
 	struct rpmsg_eptdev *eptdev = dev_to_eptdev(dev);
 
-	ida_simple_remove(&rpmsg_ept_ida, dev->id);
-	ida_simple_remove(&rpmsg_minor_ida, MINOR(eptdev->dev.devt));
+	ida_free(&rpmsg_ept_ida, dev->id);
+	ida_free(&rpmsg_minor_ida, MINOR(eptdev->dev.devt));
 	kfree(eptdev);
 }
 
@@ -441,12 +441,12 @@
 
 	eptdev->chinfo = chinfo;
 
-	ret = ida_simple_get(&rpmsg_minor_ida, 0, RPMSG_DEV_MAX, GFP_KERNEL);
+	ret = ida_alloc_max(&rpmsg_minor_ida, RPMSG_DEV_MAX - 1, GFP_KERNEL);
 	if (ret < 0)
 		goto free_eptdev;
 	dev->devt = MKDEV(MAJOR(rpmsg_major), ret);
 
-	ret = ida_simple_get(&rpmsg_ept_ida, 0, 0, GFP_KERNEL);
+	ret = ida_alloc(&rpmsg_ept_ida, GFP_KERNEL);
 	if (ret < 0)
 		goto free_minor_ida;
 	dev->id = ret;
@@ -462,9 +462,9 @@
 	return ret;
 
 free_ept_ida:
-	ida_simple_remove(&rpmsg_ept_ida, dev->id);
+	ida_free(&rpmsg_ept_ida, dev->id);
 free_minor_ida:
-	ida_simple_remove(&rpmsg_minor_ida, MINOR(dev->devt));
+	ida_free(&rpmsg_minor_ida, MINOR(dev->devt));
 free_eptdev:
 	put_device(dev);
 	kfree(eptdev);
diff --git a/drivers/rpmsg/rpmsg_core.c b/drivers/rpmsg/rpmsg_core.c
index 8abc7d0..4295c01 100644
--- a/drivers/rpmsg/rpmsg_core.c
+++ b/drivers/rpmsg/rpmsg_core.c
@@ -605,7 +605,7 @@
 		rpmsg_destroy_ept(rpdev->ept);
 }
 
-static struct bus_type rpmsg_bus = {
+static const struct bus_type rpmsg_bus = {
 	.name		= "rpmsg",
 	.match		= rpmsg_dev_match,
 	.dev_groups	= rpmsg_dev_groups,
diff --git a/drivers/rpmsg/rpmsg_ctrl.c b/drivers/rpmsg/rpmsg_ctrl.c
index 4332538..c312794 100644
--- a/drivers/rpmsg/rpmsg_ctrl.c
+++ b/drivers/rpmsg/rpmsg_ctrl.c
@@ -130,8 +130,8 @@
 {
 	struct rpmsg_ctrldev *ctrldev = dev_to_ctrldev(dev);
 
-	ida_simple_remove(&rpmsg_ctrl_ida, dev->id);
-	ida_simple_remove(&rpmsg_minor_ida, MINOR(dev->devt));
+	ida_free(&rpmsg_ctrl_ida, dev->id);
+	ida_free(&rpmsg_minor_ida, MINOR(dev->devt));
 	kfree(ctrldev);
 }
 
@@ -156,12 +156,12 @@
 	cdev_init(&ctrldev->cdev, &rpmsg_ctrldev_fops);
 	ctrldev->cdev.owner = THIS_MODULE;
 
-	ret = ida_simple_get(&rpmsg_minor_ida, 0, RPMSG_DEV_MAX, GFP_KERNEL);
+	ret = ida_alloc_max(&rpmsg_minor_ida, RPMSG_DEV_MAX - 1, GFP_KERNEL);
 	if (ret < 0)
 		goto free_ctrldev;
 	dev->devt = MKDEV(MAJOR(rpmsg_major), ret);
 
-	ret = ida_simple_get(&rpmsg_ctrl_ida, 0, 0, GFP_KERNEL);
+	ret = ida_alloc(&rpmsg_ctrl_ida, GFP_KERNEL);
 	if (ret < 0)
 		goto free_minor_ida;
 	dev->id = ret;
@@ -179,9 +179,9 @@
 	return ret;
 
 free_ctrl_ida:
-	ida_simple_remove(&rpmsg_ctrl_ida, dev->id);
+	ida_free(&rpmsg_ctrl_ida, dev->id);
 free_minor_ida:
-	ida_simple_remove(&rpmsg_minor_ida, MINOR(dev->devt));
+	ida_free(&rpmsg_minor_ida, MINOR(dev->devt));
 free_ctrldev:
 	put_device(dev);
 	kfree(ctrldev);