diff options
| author | Hannes Reinecke <hare@suse.de> | 2021-01-19 07:43:18 +0100 |
|---|---|---|
| committer | Christoph Hellwig <hch@lst.de> | 2021-02-10 16:38:06 +0100 |
| commit | ed7770f6628691c13c9423bce7eee7cff2399c12 (patch) | |
| tree | 0e2c21bda36e81b9c7dbbb23b8522f9ed70c5916 /drivers/nvme | |
| parent | 295a39f5a56f3276bae6a0ae5c26ce06bb8aa21c (diff) | |
nvme-hwmon: rework to avoid devm allocation
The original design to use device-managed resource allocation
doesn't really work as the NVMe controller has a vastly different
lifetime than the hwmon sysfs attributes, causing warning about
duplicate sysfs entries upon reconnection.
This patch reworks the hwmon allocation to avoid device-managed
resource allocation, and uses the NVMe controller as parent for
the sysfs attributes.
Cc: Guenter Roeck <linux@roeck-us.net>
Signed-off-by: Hannes Reinecke <hare@suse.de>
Tested-by: Enzo Matsumiya <ematsumiya@suse.de>
Tested-by: Daniel Wagner <dwagner@suse.de>
Signed-off-by: Christoph Hellwig <hch@lst.de>
Diffstat (limited to 'drivers/nvme')
| -rw-r--r-- | drivers/nvme/host/core.c | 1 | ||||
| -rw-r--r-- | drivers/nvme/host/hwmon.c | 31 | ||||
| -rw-r--r-- | drivers/nvme/host/nvme.h | 8 |
3 files changed, 30 insertions, 10 deletions
diff --git a/drivers/nvme/host/core.c b/drivers/nvme/host/core.c index 02579f4f776c..d77f3f26d8d3 100644 --- a/drivers/nvme/host/core.c +++ b/drivers/nvme/host/core.c @@ -4471,6 +4471,7 @@ EXPORT_SYMBOL_GPL(nvme_start_ctrl); void nvme_uninit_ctrl(struct nvme_ctrl *ctrl) { + nvme_hwmon_exit(ctrl); nvme_fault_inject_fini(&ctrl->fault_inject); dev_pm_qos_hide_latency_tolerance(ctrl->device); cdev_device_del(&ctrl->cdev, ctrl->device); diff --git a/drivers/nvme/host/hwmon.c b/drivers/nvme/host/hwmon.c index 552dbc04567b..8f9e96986780 100644 --- a/drivers/nvme/host/hwmon.c +++ b/drivers/nvme/host/hwmon.c @@ -223,12 +223,12 @@ static const struct hwmon_chip_info nvme_hwmon_chip_info = { int nvme_hwmon_init(struct nvme_ctrl *ctrl) { - struct device *dev = ctrl->dev; + struct device *dev = ctrl->device; struct nvme_hwmon_data *data; struct device *hwmon; int err; - data = devm_kzalloc(dev, sizeof(*data), GFP_KERNEL); + data = kzalloc(sizeof(*data), GFP_KERNEL); if (!data) return 0; @@ -237,19 +237,30 @@ int nvme_hwmon_init(struct nvme_ctrl *ctrl) err = nvme_hwmon_get_smart_log(data); if (err) { - dev_warn(ctrl->device, - "Failed to read smart log (error %d)\n", err); - devm_kfree(dev, data); + dev_warn(dev, "Failed to read smart log (error %d)\n", err); + kfree(data); return err; } - hwmon = devm_hwmon_device_register_with_info(dev, "nvme", data, - &nvme_hwmon_chip_info, - NULL); + hwmon = hwmon_device_register_with_info(dev, "nvme", + data, &nvme_hwmon_chip_info, + NULL); if (IS_ERR(hwmon)) { dev_warn(dev, "Failed to instantiate hwmon device\n"); - devm_kfree(dev, data); + kfree(data); } - + ctrl->hwmon_device = hwmon; return 0; } + +void nvme_hwmon_exit(struct nvme_ctrl *ctrl) +{ + if (ctrl->hwmon_device) { + struct nvme_hwmon_data *data = + dev_get_drvdata(ctrl->hwmon_device); + + hwmon_device_unregister(ctrl->hwmon_device); + ctrl->hwmon_device = NULL; + kfree(data); + } +} diff --git a/drivers/nvme/host/nvme.h b/drivers/nvme/host/nvme.h index 5819f0381041..2efb87642d18 100644 --- a/drivers/nvme/host/nvme.h +++ b/drivers/nvme/host/nvme.h @@ -246,6 +246,9 @@ struct nvme_ctrl { struct rw_semaphore namespaces_rwsem; struct device ctrl_device; struct device *device; /* char device */ +#ifdef CONFIG_NVME_HWMON + struct device *hwmon_device; +#endif struct cdev cdev; struct work_struct reset_work; struct work_struct delete_work; @@ -812,11 +815,16 @@ 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_exit(struct nvme_ctrl *ctrl); #else static inline int nvme_hwmon_init(struct nvme_ctrl *ctrl) { return 0; } + +static inline void nvme_hwmon_exit(struct nvme_ctrl *ctrl) +{ +} #endif u32 nvme_command_effects(struct nvme_ctrl *ctrl, struct nvme_ns *ns, |