linux-kernel - Re: [PATCH RESEND v2] interconnect: drop unused icc

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Date:   Tue, 23 May 2023 05:09:53 -0700
From:   Bjorn Andersson <andersson@...nel.org>
To:     Johan Hovold <johan+linaro@...nel.org>
Cc:     Georgi Djakov <djakov@...nel.org>, linux-pm@...r.kernel.org,
        linux-kernel@...r.kernel.org,
        Konrad Dybcio <konrad.dybcio@...aro.org>
Subject: Re: [PATCH RESEND v2] interconnect: drop unused icc_get() interface

On Tue, May 23, 2023 at 11:52:48AM +0200, Johan Hovold wrote:
> The icc_get() interface can be used to lookup an interconnect path based
> on global node ids. There has never been any users of this interface and
> all lookups are currently done from the devicetree.
> 
> Remove the unused icc_get() interface.
> 

Reviewed-by: Bjorn Andersson <andersson@...nel.org>

Regards,
Bjorn

> Reviewed-by: Konrad Dybcio <konrad.dybcio@...aro.org>
> Signed-off-by: Johan Hovold <johan+linaro@...nel.org>
> ---
> 
> Hi Georgi,
> 
> I just noticed that this patch never made it into 6.4 along with the
> rest of the series:
> 
> 	https://lore.kernel.org/lkml/20230306075651.2449-23-johan+linaro@kernel.org/
> 
> This interface is still unused in mainline and should be removed so
> resending the patch again.
> 
> Johan
> 
> 
>  drivers/interconnect/core.c  | 52 ++----------------------------------
>  include/linux/interconnect.h |  8 ------
>  2 files changed, 2 insertions(+), 58 deletions(-)
> 
> diff --git a/drivers/interconnect/core.c b/drivers/interconnect/core.c
> index ec46bcb16d5e..5fac448c28fd 100644
> --- a/drivers/interconnect/core.c
> +++ b/drivers/interconnect/core.c
> @@ -587,7 +587,7 @@ EXPORT_SYMBOL_GPL(icc_set_tag);
>  
>  /**
>   * icc_get_name() - Get name of the icc path
> - * @path: reference to the path returned by icc_get()
> + * @path: interconnect path
>   *
>   * This function is used by an interconnect consumer to get the name of the icc
>   * path.
> @@ -605,7 +605,7 @@ EXPORT_SYMBOL_GPL(icc_get_name);
>  
>  /**
>   * icc_set_bw() - set bandwidth constraints on an interconnect path
> - * @path: reference to the path returned by icc_get()
> + * @path: interconnect path
>   * @avg_bw: average bandwidth in kilobytes per second
>   * @peak_bw: peak bandwidth in kilobytes per second
>   *
> @@ -704,54 +704,6 @@ int icc_disable(struct icc_path *path)
>  }
>  EXPORT_SYMBOL_GPL(icc_disable);
>  
> -/**
> - * icc_get() - return a handle for path between two endpoints
> - * @dev: the device requesting the path
> - * @src_id: source device port id
> - * @dst_id: destination device port id
> - *
> - * This function will search for a path between two endpoints and return an
> - * icc_path handle on success. Use icc_put() to release
> - * constraints when they are not needed anymore.
> - * If the interconnect API is disabled, NULL is returned and the consumer
> - * drivers will still build. Drivers are free to handle this specifically,
> - * but they don't have to.
> - *
> - * Return: icc_path pointer on success, ERR_PTR() on error or NULL if the
> - * interconnect API is disabled.
> - */
> -struct icc_path *icc_get(struct device *dev, const int src_id, const int dst_id)
> -{
> -	struct icc_node *src, *dst;
> -	struct icc_path *path = ERR_PTR(-EPROBE_DEFER);
> -
> -	mutex_lock(&icc_lock);
> -
> -	src = node_find(src_id);
> -	if (!src)
> -		goto out;
> -
> -	dst = node_find(dst_id);
> -	if (!dst)
> -		goto out;
> -
> -	path = path_find(dev, src, dst);
> -	if (IS_ERR(path)) {
> -		dev_err(dev, "%s: invalid path=%ld\n", __func__, PTR_ERR(path));
> -		goto out;
> -	}
> -
> -	path->name = kasprintf(GFP_KERNEL, "%s-%s", src->name, dst->name);
> -	if (!path->name) {
> -		kfree(path);
> -		path = ERR_PTR(-ENOMEM);
> -	}
> -out:
> -	mutex_unlock(&icc_lock);
> -	return path;
> -}
> -EXPORT_SYMBOL_GPL(icc_get);
> -
>  /**
>   * icc_put() - release the reference to the icc_path
>   * @path: interconnect path
> diff --git a/include/linux/interconnect.h b/include/linux/interconnect.h
> index 2b0e784ba771..97ac253df62c 100644
> --- a/include/linux/interconnect.h
> +++ b/include/linux/interconnect.h
> @@ -40,8 +40,6 @@ struct icc_bulk_data {
>  
>  #if IS_ENABLED(CONFIG_INTERCONNECT)
>  
> -struct icc_path *icc_get(struct device *dev, const int src_id,
> -			 const int dst_id);
>  struct icc_path *of_icc_get(struct device *dev, const char *name);
>  struct icc_path *devm_of_icc_get(struct device *dev, const char *name);
>  int devm_of_icc_bulk_get(struct device *dev, int num_paths, struct icc_bulk_data *paths);
> @@ -61,12 +59,6 @@ void icc_bulk_disable(int num_paths, const struct icc_bulk_data *paths);
>  
>  #else
>  
> -static inline struct icc_path *icc_get(struct device *dev, const int src_id,
> -				       const int dst_id)
> -{
> -	return NULL;
> -}
> -
>  static inline struct icc_path *of_icc_get(struct device *dev,
>  					  const char *name)
>  {
> -- 
> 2.39.3
>