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nvme-hwmon: rework to avoid devm allocation 

[ Upstream commit ed7770f662 ]

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>
Stable-dep-of: c94b7f9bab ("nvme-hwmon: kmalloc the NVME SMART log buffer")
Signed-off-by: Sasha Levin <sashal@kernel.org>
This commit is contained in:
Hannes Reinecke 2021-01-19 07:43:18 +01:00 committed by Greg Kroah-Hartman
parent 191d71c635
commit bc17f727b0
3 changed files with 30 additions and 10 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

1
drivers/nvme/host/core.c
View File

@ -4485,6 +4485,7 @@ 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);

31
drivers/nvme/host/hwmon.c
View File

@ -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);
}
}

8
drivers/nvme/host/nvme.h
View File

@ -257,6 +257,9 @@ 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;
@ -876,11 +879,16 @@ 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,