linux-kernel - Re: [PATCH v2 6/9] i2c: atr: deduplicate logic in attach

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Message-ID: <3644500.iIbC2pHGDl@fw-rgant>
Date: Thu, 27 Feb 2025 14:36:17 +0100
From: Romain Gantois <romain.gantois@...tlin.com>
To: Cosmin Tanislav <demonsingur@...il.com>
Cc: Tomi Valkeinen <tomi.valkeinen@...asonboard.com>,
 Luca Ceresoli <luca.ceresoli@...tlin.com>,
 Wolfram Sang <wsa+renesas@...g-engineering.com>, linux-i2c@...r.kernel.org,
 linux-kernel@...r.kernel.org, Cosmin Tanislav <demonsingur@...il.com>
Subject: Re: [PATCH v2 6/9] i2c: atr: deduplicate logic in attach_addr()

On mardi 25 février 2025 12:39:34 heure normale d’Europe centrale Cosmin 
Tanislav wrote:
> This is the same logic as in i2c_atr_create_mapping_by_addr().
> 
> Signed-off-by: Cosmin Tanislav <demonsingur@...il.com>
> ---
>  drivers/i2c/i2c-atr.c | 30 ++++++------------------------
>  1 file changed, 6 insertions(+), 24 deletions(-)
> 
> diff --git a/drivers/i2c/i2c-atr.c b/drivers/i2c/i2c-atr.c
> index b62aa6ae452e..5b53eaee0408 100644
> --- a/drivers/i2c/i2c-atr.c
> +++ b/drivers/i2c/i2c-atr.c
> @@ -538,38 +538,20 @@ static int i2c_atr_attach_addr(struct i2c_adapter
> *adapter, struct i2c_atr_chan *chan = adapter->algo_data;
>  	struct i2c_atr *atr = chan->atr;
>  	struct i2c_atr_alias_pair *c2a;
> -	u16 alias;
> -	int ret;
> -
> -	ret = i2c_atr_reserve_alias(chan->alias_pool);
> -	if (ret < 0) {
> -		dev_err(atr->dev, "failed to find a free alias\n");
> -		return ret;
> -	}
> -
> -	alias = ret;
> +	int ret = 0;
> 
>  	mutex_lock(&chan->alias_pairs_lock);

A mutex guard could be used here.

> 
> -	c2a = i2c_atr_create_c2a(chan, alias, addr);
> +	c2a = i2c_atr_create_mapping_by_addr(chan, addr);
>  	if (!c2a) {
> -		ret = -ENOMEM;
> -		goto err_release_alias;
> +		dev_err(atr->dev, "failed to find a free alias\n");
> +		ret = -EBUSY;
> +		goto out_unlock;
>  	}
> 
> -	ret = atr->ops->attach_addr(atr, chan->chan_id, addr, alias);
> -	if (ret)
> -		goto err_del_c2a;
> -
>  	dev_dbg(atr->dev, "chan%u: using alias 0x%02x for addr 0x%02x\n",
> -		chan->chan_id, alias, addr);
> +		chan->chan_id, c2a->alias, addr);
> 
> -	goto out_unlock;
> -
> -err_del_c2a:
> -	i2c_atr_destroy_c2a(&c2a);
> -err_release_alias:
> -	i2c_atr_release_alias(chan->alias_pool, alias);
>  out_unlock:
>  	mutex_unlock(&chan->alias_pairs_lock);
>  	return ret;

Best Regards,

-- 
Romain Gantois, Bootlin
Embedded Linux and Kernel engineering
https://bootlin.com

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