linux-kernel - Re: [RFC PATCH v8 03/10] dpll: core: Add DPLL framework base functions

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Message-ID: <20230612164515.6eacefb1@kernel.org>
Date:   Mon, 12 Jun 2023 16:45:15 -0700
From:   Jakub Kicinski <kuba@...nel.org>
To:     Arkadiusz Kubalewski <arkadiusz.kubalewski@...el.com>
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Subject: Re: [RFC PATCH v8 03/10] dpll: core: Add DPLL framework base
 functions

On Fri,  9 Jun 2023 14:18:46 +0200 Arkadiusz Kubalewski wrote:
> +	xa_for_each(xa_pins, i, ref) {
> +		if (ref->pin != pin)
> +			continue;
> +		reg = dpll_pin_registration_find(ref, ops, priv);
> +		if (reg) {
> +			refcount_inc(&ref->refcount);
> +			return 0;
> +		}
> +		ref_exists = true;
> +		break;
> +	}
> +
> +	if (!ref_exists) {
> +		ref = kzalloc(sizeof(*ref), GFP_KERNEL);
> +		if (!ref)
> +			return -ENOMEM;
> +		ref->pin = pin;
> +		INIT_LIST_HEAD(&ref->registration_list);
> +		ret = xa_insert(xa_pins, pin->pin_idx, ref, GFP_KERNEL);
> +		if (ret) {
> +			kfree(ref);
> +			return ret;
> +		}
> +		refcount_set(&ref->refcount, 1);
> +	}
> +
> +	reg = kzalloc(sizeof(*reg), GFP_KERNEL);

Why do we have two structures - ref and reg?

> +	if (!reg) {
> +		if (!ref_exists)
> +			kfree(ref);

ref has already been inserted into xa_pins

> +		return -ENOMEM;