linux-kernel - Re: [RFC PATCH v9 03/10] dpll: core: Add DPLL framework base functions

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Date:   Thu, 29 Jun 2023 10:13:43 +0200
From:   Jiri Pirko <jiri@...nulli.us>
To:     Arkadiusz Kubalewski <arkadiusz.kubalewski@...el.com>
Cc:     kuba@...nel.org, vadfed@...a.com, jonathan.lemon@...il.com,
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        vadim.fedorenko@...ux.dev
Subject: Re: [RFC PATCH v9 03/10] dpll: core: Add DPLL framework base
 functions

Fri, Jun 23, 2023 at 02:38:13PM CEST, arkadiusz.kubalewski@...el.com wrote:
>From: Vadim Fedorenko <vadim.fedorenko@...ux.dev>
>

One thing I forgot to point out the last time:

[...]	
	
>+int
>+dpll_pin_register(struct dpll_device *dpll, struct dpll_pin *pin,
>+		  const struct dpll_pin_ops *ops, void *priv)
>+{
>+	int ret;
>+
>+	if (WARN_ON(!ops) ||
>+	    WARN_ON(!ops->state_on_dpll_get) ||
>+	    WARN_ON(!ops->direction_get))

Please add check that you don't register to dpll instance which is
unregistered. Similar check needs to be added to pin_on_pin register.

Also, make sure you don't unregister dpll device/pin which has child
pins registered under it.


>+		return -EINVAL;
>+
>+	mutex_lock(&dpll_lock);
>+	if (WARN_ON(!(dpll->module == pin->module &&
>+		      dpll->clock_id == pin->clock_id)))
>+		ret = -EINVAL;
>+	else
>+		ret = __dpll_pin_register(dpll, pin, ops, priv);
>+	mutex_unlock(&dpll_lock);
>+
>+	return ret;
>+}

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