nvme: use ida_simple_{get,remove} for the controller instance

Switch to the ida_simple_* helpers instead of opencoding them.

Signed-off-by: Christoph Hellwig <hch@lst.de>
Reviewed-by: Keith Busch <keith.busch@intel.com>
Reviewed-by: Sagi Grimberg <sagi@grimberg.me>
Reviewed-by: Johannes Thumshirn <jthumshirn@suse.de>

diff --git a/drivers/nvme/host/core.c b/drivers/nvme/host/core.c
index c951556..7fae42d 100644 (file)
--- a/drivers/nvme/host/core.c
+++ b/drivers/nvme/host/core.c
@@ -74,6 +74,8 @@ EXPORT_SYMBOL_GPL(nvme_wq);
 static LIST_HEAD(nvme_ctrl_list);
 static DEFINE_SPINLOCK(dev_list_lock);
 
+static DEFINE_IDA(nvme_instance_ida);
+
 static struct class *nvme_class;
 
 static __le32 nvme_get_log_dw10(u8 lid, size_t size)
@@ -2696,35 +2698,6 @@ void nvme_queue_async_events(struct nvme_ctrl *ctrl)
 }
 EXPORT_SYMBOL_GPL(nvme_queue_async_events);
 
-static DEFINE_IDA(nvme_instance_ida);
-
-static int nvme_set_instance(struct nvme_ctrl *ctrl)
-{
-       int instance, error;
-
-       do {
-               if (!ida_pre_get(&nvme_instance_ida, GFP_KERNEL))
-                       return -ENODEV;
-
-               spin_lock(&dev_list_lock);
-               error = ida_get_new(&nvme_instance_ida, &instance);
-               spin_unlock(&dev_list_lock);
-       } while (error == -EAGAIN);
-
-       if (error)
-               return -ENODEV;
-
-       ctrl->instance = instance;
-       return 0;
-}
-
-static void nvme_release_instance(struct nvme_ctrl *ctrl)
-{
-       spin_lock(&dev_list_lock);
-       ida_remove(&nvme_instance_ida, ctrl->instance);
-       spin_unlock(&dev_list_lock);
-}
-
 void nvme_stop_ctrl(struct nvme_ctrl *ctrl)
 {
        nvme_stop_keep_alive(ctrl);
@@ -2762,7 +2735,7 @@ static void nvme_free_ctrl(struct kref *kref)
        struct nvme_ctrl *ctrl = container_of(kref, struct nvme_ctrl, kref);
 
        put_device(ctrl->device);
-       nvme_release_instance(ctrl);
+       ida_simple_remove(&nvme_instance_ida, ctrl->instance);
        ida_destroy(&ctrl->ns_ida);
 
        ctrl->ops->free_ctrl(ctrl);
@@ -2796,9 +2769,10 @@ int nvme_init_ctrl(struct nvme_ctrl *ctrl, struct device *dev,
        INIT_WORK(&ctrl->async_event_work, nvme_async_event_work);
        INIT_WORK(&ctrl->fw_act_work, nvme_fw_act_work);
 
-       ret = nvme_set_instance(ctrl);
-       if (ret)
+       ret = ida_simple_get(&nvme_instance_ida, 0, 0, GFP_KERNEL);
+       if (ret < 0)
                goto out;
+       ctrl->instance = ret;
 
        ctrl->device = device_create_with_groups(nvme_class, ctrl->dev,
                                MKDEV(nvme_char_major, ctrl->instance),
@@ -2825,7 +2799,7 @@ int nvme_init_ctrl(struct nvme_ctrl *ctrl, struct device *dev,
 
        return 0;
 out_release_instance:
-       nvme_release_instance(ctrl);
+       ida_simple_remove(&nvme_instance_ida, ctrl->instance);
 out:
        return ret;
 }