linux-kernel - Re: [PATCH] mux: add missing mux_state

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Date:   Mon, 20 Dec 2021 12:27:06 +0530
From:   Aswath Govindraju <a-govindraju@...com>
To:     Peter Rosin <peda@...ntia.se>
CC:     <linux-kernel@...r.kernel.org>, <devicetree@...r.kernel.org>,
        Rob Herring <robh+dt@...nel.org>,
        Marc Kleine-Budde <mkl@...gutronix.de>,
        Vignesh Raghavendra <vigneshr@...com>,
        Kishon Vijay Abraham I <kishon@...com>
Subject: Re: [PATCH] mux: add missing mux_state_get


On 19/12/21 12:07 am, Peter Rosin wrote:
> And implement devm_mux_state_get in terms of the new function.
> 
> Signed-off-by: Peter Rosin <peda@...ntia.se>

Tested-by: Aswath Govindraju <a-govindraju@...com>

Thanks,
Aswath

> ---
>  drivers/mux/core.c           | 41 ++++++++++++++++++++++++++----------
>  include/linux/mux/consumer.h |  1 +
>  2 files changed, 31 insertions(+), 11 deletions(-)
> 
> diff --git a/drivers/mux/core.c b/drivers/mux/core.c
> index 7d38e7c0c02e..90073ce01539 100644
> --- a/drivers/mux/core.c
> +++ b/drivers/mux/core.c
> @@ -673,6 +673,33 @@ struct mux_control *devm_mux_control_get(struct device *dev,
>  }
>  EXPORT_SYMBOL_GPL(devm_mux_control_get);
>  
> +/**
> + * mux_state_get() - Get the mux-state for a device.
> + * @dev: The device that needs a mux-state.
> + * @mux_name: The name identifying the mux-state.
> + *
> + * Return: A pointer to the mux-state, or an ERR_PTR with a negative errno.
> + */
> +struct mux_state *mux_state_get(struct device *dev, const char *mux_name)
> +{
> +	struct mux_state *mstate;
> +
> +	mstate = kzalloc(sizeof(*mstate), GFP_KERNEL);
> +	if (!mstate)
> +		return ERR_PTR(-ENOMEM);
> +
> +	mstate->mux = mux_get(dev, mux_name, &mstate->state);
> +	if (IS_ERR(mstate->mux)) {
> +		int err = PTR_ERR(mstate->mux);
> +
> +		kfree(mstate);
> +		return ERR_PTR(err);
> +	}
> +
> +	return mstate;
> +}
> +EXPORT_SYMBOL_GPL(mux_state_get);
> +
>  /**
>   * mux_state_put() - Put away the mux-state for good.
>   * @mstate: The mux-state to put away.
> @@ -705,25 +732,17 @@ struct mux_state *devm_mux_state_get(struct device *dev,
>  				     const char *mux_name)
>  {
>  	struct mux_state **ptr, *mstate;
> -	struct mux_control *mux_ctrl;
> -	int state;
> -
> -	mstate = devm_kzalloc(dev, sizeof(struct mux_state), GFP_KERNEL);
> -	if (!mstate)
> -		return ERR_PTR(-ENOMEM);
>  
>  	ptr = devres_alloc(devm_mux_state_release, sizeof(*ptr), GFP_KERNEL);
>  	if (!ptr)
>  		return ERR_PTR(-ENOMEM);
>  
> -	mux_ctrl = mux_get(dev, mux_name, &state);
> -	if (IS_ERR(mux_ctrl)) {
> +	mstate = mux_state_get(dev, mux_name);
> +	if (IS_ERR(mstate)) {
>  		devres_free(ptr);
> -		return (struct mux_state *)mux_ctrl;
> +		return mstate;
>  	}
>  
> -	mstate->mux = mux_ctrl;
> -	mstate->state = state;
>  	*ptr = mstate;
>  	devres_add(dev, ptr);
>  
> diff --git a/include/linux/mux/consumer.h b/include/linux/mux/consumer.h
> index babf2a744056..944678604549 100644
> --- a/include/linux/mux/consumer.h
> +++ b/include/linux/mux/consumer.h
> @@ -54,6 +54,7 @@ int mux_control_deselect(struct mux_control *mux);
>  int mux_state_deselect(struct mux_state *mstate);
>  
>  struct mux_control *mux_control_get(struct device *dev, const char *mux_name);
> +struct mux_state *mux_state_get(struct device *dev, const char *mux_name);
>  void mux_control_put(struct mux_control *mux);
>  void mux_state_put(struct mux_state *mstate);
>  
>