linux-kernel - Re: [PATCH v10 2/7] i3c: master: use i3c_master

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Date:   Thu, 3 Dec 2020 23:24:05 -0500 (EST)
From:   Nicolas Pitre <nico@...xnic.net>
To:     Parshuram Thombare <pthombar@...ence.com>
cc:     alexandre.belloni@...tlin.com, slongerbeam@...il.com,
        vitor.soares@...opsys.com, praneeth@...com, mparab@...ence.com,
        linux-i3c@...ts.infradead.org, linux-kernel@...r.kernel.org
Subject: Re: [PATCH v10 2/7] i3c: master: use i3c_master_register only for
 main master

On Mon, 30 Nov 2020, Parshuram Thombare wrote:

> Removed last argument 'secondary' and restructured i3c_master_register
> to move code that can be common to i3c_secondary_master_register
> to separate function i3c_master_init.
> 
> Signed-off-by: Parshuram Thombare <pthombar@...ence.com>

[...]

> +static int i3c_master_init(struct i3c_master_controller *master,
> +			   struct device *parent,
> +			   const struct i3c_master_controller_ops *ops,
> +			   bool secondary)
>  {
>  	unsigned long i2c_scl_rate = I3C_BUS_I2C_FM_PLUS_SCL_RATE;
>  	struct i3c_bus *i3cbus = i3c_master_get_bus(master);
> @@ -2535,10 +2514,49 @@ int i3c_master_register(struct i3c_master_controller *master,
>  		goto err_put_dev;
>  	}
>  
> -	ret = i3c_master_bus_init(master);
> +	ret = i3c_primary_master_bus_init(master);
>  	if (ret)
>  		goto err_destroy_wq;
>  
> +	return 0;
> +
> +err_destroy_wq:
> +	destroy_workqueue(master->wq);
> +
> +err_put_dev:
> +	put_device(&master->dev);
> +
> +	return ret;
> +}

[...]

> +int i3c_primary_master_register(struct i3c_master_controller *master,
> +				struct device *parent,
> +				const struct i3c_master_controller_ops *ops)
> +{
> +	int ret;
> +
> +	ret = i3c_master_init(master, parent, ops, false);
> +	if (ret)
> +		return ret;
> +
>  	ret = device_add(&master->dev);
>  	if (ret)
>  		goto err_cleanup_bus;
> @@ -2568,15 +2586,13 @@ int i3c_master_register(struct i3c_master_controller *master,
>  err_cleanup_bus:
>  	i3c_master_bus_cleanup(master);
>  
> -err_destroy_wq:
>  	destroy_workqueue(master->wq);
>  
> -err_put_dev:
>  	put_device(&master->dev);
>  
>  	return ret;
>  }

This looks a bit confusing. Here you're rolling back detailss in 
i3c_primary_master_register() that were factored out in 
i3c_master_init(). If i3c_master_init() is successful, then you 
shouldn't be undoing its things openly in i3c_primary_master_register(). 
Instead, there should be another function that does the reverse of 
i3c_master_init() here.


Nicolas