linux-kernel - Re: [PATCH 08/10] bus/fsl-mc: Export a cleanup function for DPRC

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Message-ID: <67018c5d-4a60-6b15-ea35-37a36c4f9e0f@nxp.com>
Date:   Mon, 23 Mar 2020 14:52:49 +0200
From:   Laurentiu Tudor <laurentiu.tudor@....com>
To:     Diana Craciun <diana.craciun@....nxp.com>,
        linux-kernel@...r.kernel.org, stuyoder@...il.com,
        leoyang.li@....com, linux-arm-kernel@...ts.infradead.org,
        bharatb.yadav@...il.com
Subject: Re: [PATCH 08/10] bus/fsl-mc: Export a cleanup function for DPRC



On 3/19/2020 5:40 PM, Diana Craciun wrote:
> Create and export a cleanup function for DPRC. The function
> is used by the DPRC driver, but it will be used by the VFIO
> driver as well.
> 
> Signed-off-by: Diana Craciun <diana.craciun@....nxp.com>
> ---
>  drivers/bus/fsl-mc/dprc-driver.c | 52 ++++++++++++++++++++++++--------
>  include/linux/fsl/mc.h           |  2 ++
>  2 files changed, 41 insertions(+), 13 deletions(-)
> 
> diff --git a/drivers/bus/fsl-mc/dprc-driver.c b/drivers/bus/fsl-mc/dprc-driver.c
> index 789220f0372a..a655e3fee291 100644
> --- a/drivers/bus/fsl-mc/dprc-driver.c
> +++ b/drivers/bus/fsl-mc/dprc-driver.c
> @@ -725,33 +725,25 @@ static void dprc_teardown_irq(struct fsl_mc_device *mc_dev)
>  }
>  
>  /**
> - * dprc_remove - callback invoked when a DPRC is being unbound from this driver
> + * dprc_cleanup - function that cleanups a DPRC
>   *
>   * @mc_dev: Pointer to fsl-mc device representing the DPRC
>   *
> - * It removes the DPRC's child objects from Linux (not from the MC) and
> - * closes the DPRC device in the MC.
> - * It tears down the interrupts that were configured for the DPRC device.
> + * It closes the DPRC device in the MC.
>   * It destroys the interrupt pool associated with this MC bus.
>   */
> -static int dprc_remove(struct fsl_mc_device *mc_dev)
> +

nit: extra white space?

---
Best Regards, Laurentiu

> +int dprc_cleanup(struct fsl_mc_device *mc_dev)
>  {
>  	int error;
>  	struct fsl_mc_bus *mc_bus = to_fsl_mc_bus(mc_dev);
>  
>  	if (!is_fsl_mc_bus_dprc(mc_dev))
>  		return -EINVAL;
> -	if (!mc_dev->mc_io)
> -		return -EINVAL;
>  
> -	if (!mc_bus->irq_resources)
> +	if (!mc_dev->mc_io)
>  		return -EINVAL;
>  
> -	if (dev_get_msi_domain(&mc_dev->dev))
> -		dprc_teardown_irq(mc_dev);
> -
> -	device_for_each_child(&mc_dev->dev, NULL, __fsl_mc_device_remove);
> -
>  	if (dev_get_msi_domain(&mc_dev->dev)) {
>  		fsl_mc_cleanup_irq_pool(mc_bus);
>  		dev_set_msi_domain(&mc_dev->dev, NULL);
> @@ -768,6 +760,40 @@ static int dprc_remove(struct fsl_mc_device *mc_dev)
>  		mc_dev->mc_io = NULL;
>  	}
>  
> +	return 0;
> +}
> +EXPORT_SYMBOL_GPL(dprc_cleanup);
> +
> +/**
> + * dprc_remove - callback invoked when a DPRC is being unbound from this driver
> + *
> + * @mc_dev: Pointer to fsl-mc device representing the DPRC
> + *
> + * It removes the DPRC's child objects from Linux (not from the MC) and
> + * closes the DPRC device in the MC.
> + * It tears down the interrupts that were configured for the DPRC device.
> + * It destroys the interrupt pool associated with this MC bus.
> + */
> +static int dprc_remove(struct fsl_mc_device *mc_dev)
> +{
> +	int error;
> +	struct fsl_mc_bus *mc_bus = to_fsl_mc_bus(mc_dev);
> +
> +	if (!is_fsl_mc_bus_dprc(mc_dev))
> +		return -EINVAL;
> +
> +	if (!mc_bus->irq_resources)
> +		return -EINVAL;
> +
> +	if (dev_get_msi_domain(&mc_dev->dev))
> +		dprc_teardown_irq(mc_dev);
> +
> +	device_for_each_child(&mc_dev->dev, NULL, __fsl_mc_device_remove);
> +
> +	error = dprc_cleanup(mc_dev);
> +	if (error < 0)
> +		dev_err(&mc_dev->dev, "dprc_close() failed: %d\n", error);
> +
>  	dev_info(&mc_dev->dev, "DPRC device unbound from driver");
>  	return 0;
>  }
> diff --git a/include/linux/fsl/mc.h b/include/linux/fsl/mc.h
> index 2bdd96a482fb..e3ba273a1122 100644
> --- a/include/linux/fsl/mc.h
> +++ b/include/linux/fsl/mc.h
> @@ -480,6 +480,8 @@ int dprc_scan_container(struct fsl_mc_device *mc_bus_dev,
>  		   const char *driver_override,
>  		   bool alloc_interrupts);
>  
> +int dprc_cleanup(struct fsl_mc_device *mc_dev);
> +
>  /*
>   * Data Path Buffer Pool (DPBP) API
>   * Contains initialization APIs and runtime control APIs for DPBP
>