linux-kernel - [PATCH AUTOSEL 6.0 32/34] nvme-hwmon: consistently ignore errors from nvme_hwmon

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Message-Id: <20221101112726.799368-32-sashal@kernel.org>
Date:   Tue,  1 Nov 2022 07:27:24 -0400
From:   Sasha Levin <sashal@...nel.org>
To:     linux-kernel@...r.kernel.org, stable@...r.kernel.org
Cc:     Christoph Hellwig <hch@....de>, Guenter Roeck <linux@...ck-us.net>,
        Serge Semin <fancer.lancer@...il.com>,
        Sasha Levin <sashal@...nel.org>, kbusch@...nel.org,
        axboe@...com, sagi@...mberg.me, linux-nvme@...ts.infradead.org
Subject: [PATCH AUTOSEL 6.0 32/34] nvme-hwmon: consistently ignore errors from nvme_hwmon_init

From: Christoph Hellwig <hch@....de>

[ Upstream commit 6b8cf94005187952f794c0c4ed3920a1e8accfa3 ]

An NVMe controller works perfectly fine even when the hwmon
initialization fails.  Stop returning errors that do not come from a
controller reset from nvme_hwmon_init to handle this case consistently.

Signed-off-by: Christoph Hellwig <hch@....de>
Reviewed-by: Guenter Roeck <linux@...ck-us.net>
Reviewed-by: Serge Semin <fancer.lancer@...il.com>
Signed-off-by: Sasha Levin <sashal@...nel.org>
---
 drivers/nvme/host/core.c  |  6 +++++-
 drivers/nvme/host/hwmon.c | 13 ++++++++-----
 2 files changed, 13 insertions(+), 6 deletions(-)

diff --git a/drivers/nvme/host/core.c b/drivers/nvme/host/core.c
index 59e4b188fc71..ed47c256dbd2 100644
--- a/drivers/nvme/host/core.c
+++ b/drivers/nvme/host/core.c
@@ -3256,8 +3256,12 @@ int nvme_init_ctrl_finish(struct nvme_ctrl *ctrl)
 		return ret;
 
 	if (!ctrl->identified && !nvme_discovery_ctrl(ctrl)) {
+		/*
+		 * Do not return errors unless we are in a controller reset,
+		 * the controller works perfectly fine without hwmon.
+		 */
 		ret = nvme_hwmon_init(ctrl);
-		if (ret < 0)
+		if (ret == -EINTR)
 			return ret;
 	}
 
diff --git a/drivers/nvme/host/hwmon.c b/drivers/nvme/host/hwmon.c
index 0a586d712920..23918bb7bdca 100644
--- a/drivers/nvme/host/hwmon.c
+++ b/drivers/nvme/host/hwmon.c
@@ -230,7 +230,7 @@ int nvme_hwmon_init(struct nvme_ctrl *ctrl)
 
 	data = kzalloc(sizeof(*data), GFP_KERNEL);
 	if (!data)
-		return 0;
+		return -ENOMEM;
 
 	data->ctrl = ctrl;
 	mutex_init(&data->read_lock);
@@ -238,8 +238,7 @@ 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 err_free_data;
 	}
 
 	hwmon = hwmon_device_register_with_info(dev, "nvme",
@@ -247,11 +246,15 @@ 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);
+		err = PTR_ERR(hwmon);
+		goto err_free_data;
 	}
 	ctrl->hwmon_device = hwmon;
 	return 0;
+
+err_free_data:
+	kfree(data);
+	return err;
 }
 
 void nvme_hwmon_exit(struct nvme_ctrl *ctrl)
-- 
2.35.1