Re: [PATCH] PM / devfreq: Add new name attribute for sysfs

Greg KH
2018-08-29T10:57:44Z

On Wed, Aug 29, 2018 at 04:34:06PM +0900, Chanwoo Choi wrote:
> commit 4585fbcb5331 ("PM / devfreq: Modify the device name as devfreq(X) for
> sysfs") changed the node name to devfreq(x). After this commit, it is not
> possible to get the device name through /sys/class/devfreq/devfreq(X)/*.
>
> Add new name attribute in order to get device name.
>
> Cc: stable@vger.kernel.org
> Fixes: 4585fbcb5331 ("PM / devfreq: Modify the device name as devfreq(X) for sysfs")
> Signed-off-by: Chanwoo Choi <cw00.choi@samsung.com>
> ---
> drivers/devfreq/devfreq.c | 11 +++++++++++
> include/linux/devfreq.h | 3 +++
> 2 files changed, 14 insertions(+)
>
> diff --git a/drivers/devfreq/devfreq.c b/drivers/devfreq/devfreq.c
> index 4c49bb1330b5..2145563d5ee5 100644
> --- a/drivers/devfreq/devfreq.c
> +++ b/drivers/devfreq/devfreq.c
> @@ -620,6 +620,9 @@ struct devfreq *devfreq_add_device(struct device *dev,
> }
> devfreq->max_freq = devfreq->scaling_max_freq;
>
> + devfreq->name = dev_name(devfreq->dev.parent);
> + if (IS_ERR_OR_NULL(devfreq->name))
> + return -EINVAL;
> dev_set_name(&devfreq->dev, "devfreq%d",
> atomic_inc_return(&devfreq_no));
> err = device_register(&devfreq->dev);
> @@ -1261,6 +1264,13 @@ static ssize_t trans_stat_show(struct device *dev,
> }
> static DEVICE_ATTR_RO(trans_stat);
>
> +static ssize_t name_show(struct device *dev,
> + struct device_attribute *attr, char *buf)
> +{
> + return sprintf(buf, "%s\n", to_devfreq(dev)->name);
> +}
> +static DEVICE_ATTR_RO(name);

You need a new Documentation/ABI/ entry for this.

thanks,

greg k-h