[PATCH] nvme-hwmon: don't return errors from nvme_hwmon_init

[Christoph Hellwig <hch@lst.de>]

An NVMe controller works perfectly fine even when the hwmon
initialization fails.  Stop returning errors from nvme_hwmon_init to
handle this case consistently.

Signed-off-by: Christoph Hellwig <hch@lst.de>
---

This should go before the patch from Serge to document and consistently
handle the lack of initialization failure handling for hwmon.

 drivers/nvme/host/core.c  |  7 ++-----
 drivers/nvme/host/hwmon.c | 16 +++++++++-------
 drivers/nvme/host/nvme.h  |  5 ++---
 3 files changed, 13 insertions(+), 15 deletions(-)

diff --git a/drivers/nvme/host/core.c b/drivers/nvme/host/core.c
index 9cbe7854d4883..952768966bdcd 100644
--- a/drivers/nvme/host/core.c
+++ b/drivers/nvme/host/core.c
@@ -3261,11 +3261,8 @@ int nvme_init_ctrl_finish(struct nvme_ctrl *ctrl)
 	if (ret < 0)
 		return ret;
 
-	if (!ctrl->identified && !nvme_discovery_ctrl(ctrl)) {
-		ret = nvme_hwmon_init(ctrl);
-		if (ret < 0)
-			return ret;
-	}
+	if (!ctrl->identified && !nvme_discovery_ctrl(ctrl))
+		nvme_hwmon_init(ctrl);
 
 	ctrl->identified = true;
 
diff --git a/drivers/nvme/host/hwmon.c b/drivers/nvme/host/hwmon.c
index 0a586d7129201..c6ddb8b46c699 100644
--- a/drivers/nvme/host/hwmon.c
+++ b/drivers/nvme/host/hwmon.c
@@ -221,7 +221,8 @@ static const struct hwmon_chip_info nvme_hwmon_chip_info = {
 	.info	= nvme_hwmon_info,
 };
 
-int nvme_hwmon_init(struct nvme_ctrl *ctrl)
+/* do not return errors - nvme works fine without hwmon registration */
+void nvme_hwmon_init(struct nvme_ctrl *ctrl)
 {
 	struct device *dev = ctrl->device;
 	struct nvme_hwmon_data *data;
@@ -230,7 +231,7 @@ int nvme_hwmon_init(struct nvme_ctrl *ctrl)
 
 	data = kzalloc(sizeof(*data), GFP_KERNEL);
 	if (!data)
-		return 0;
+		return;
 
 	data->ctrl = ctrl;
 	mutex_init(&data->read_lock);
@@ -238,8 +239,7 @@ int nvme_hwmon_init(struct nvme_ctrl *ctrl)
 	err = nvme_hwmon_get_smart_log(data);
 	if (err) {
 		dev_warn(dev, "Failed to read smart log (error %d)\n", err);
-		kfree(data);
-		return err;
+		goto out_free_data;
 	}
 
 	hwmon = hwmon_device_register_with_info(dev, "nvme",
@@ -247,11 +247,13 @@ int nvme_hwmon_init(struct nvme_ctrl *ctrl)
 						NULL);
 	if (IS_ERR(hwmon)) {
 		dev_warn(dev, "Failed to instantiate hwmon device\n");
-		kfree(data);
-		return PTR_ERR(hwmon);
+		goto out_free_data;
 	}
 	ctrl->hwmon_device = hwmon;
-	return 0;
+	return;
+
+out_free_data:
+	kfree(data);
 }
 
 void nvme_hwmon_exit(struct nvme_ctrl *ctrl)
diff --git a/drivers/nvme/host/nvme.h b/drivers/nvme/host/nvme.h
index a29877217ee65..4cd3e00c47a2b 100644
--- a/drivers/nvme/host/nvme.h
+++ b/drivers/nvme/host/nvme.h
@@ -1000,12 +1000,11 @@ static inline struct nvme_ns *nvme_get_ns_from_dev(struct device *dev)
 }
 
 #ifdef CONFIG_NVME_HWMON
-int nvme_hwmon_init(struct nvme_ctrl *ctrl);
+void nvme_hwmon_init(struct nvme_ctrl *ctrl);
 void nvme_hwmon_exit(struct nvme_ctrl *ctrl);
 #else
-static inline int nvme_hwmon_init(struct nvme_ctrl *ctrl)
+static inline void nvme_hwmon_init(struct nvme_ctrl *ctrl)
 {
-	return 0;
 }
 
 static inline void nvme_hwmon_exit(struct nvme_ctrl *ctrl)
-- 
2.30.2