netdev - Re: [PATCH RFC v6 2/6] dpll: Add DPLL framework base functions

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Date:   Tue, 14 Mar 2023 10:30:03 +0100
From:   Jiri Pirko <jiri@...nulli.us>
To:     Vadim Fedorenko <vadfed@...a.com>
Cc:     Jakub Kicinski <kuba@...nel.org>,
        Arkadiusz Kubalewski <arkadiusz.kubalewski@...el.com>,
        Jonathan Lemon <jonathan.lemon@...il.com>,
        Paolo Abeni <pabeni@...hat.com>,
        Vadim Fedorenko <vadim.fedorenko@...ux.dev>, poros@...hat.com,
        mschmidt@...hat.com, netdev@...r.kernel.org,
        linux-arm-kernel@...ts.infradead.org, linux-clk@...r.kernel.org,
        Milena Olech <milena.olech@...el.com>,
        Michal Michalik <michal.michalik@...el.com>
Subject: Re: [PATCH RFC v6 2/6] dpll: Add DPLL framework base functions

Sun, Mar 12, 2023 at 03:28:03AM CET, vadfed@...a.com wrote:

[...]


>+struct dpll_pin *
>+dpll_pin_alloc(u64 clock_id, u8 device_drv_id,	struct module *module,
>+	       const struct dpll_pin_properties *prop)
>+{
>+	struct dpll_pin *pin;
>+	int ret;
>+
>+	pin = kzalloc(sizeof(*pin), GFP_KERNEL);
>+	if (!pin)
>+		return ERR_PTR(-ENOMEM);
>+	pin->dev_driver_id = device_drv_id;
>+	pin->clock_id = clock_id;
>+	pin->module = module;
>+	refcount_set(&pin->refcount, 1);
>+	if (WARN_ON(!prop->description)) {
>+		ret = -EINVAL;
>+		goto release;
>+	}
>+	pin->prop.description = kstrdup(prop->description, GFP_KERNEL);
>+	if (!pin->prop.description) {
>+		ret = -ENOMEM;
>+		goto release;
>+	}
>+	if (WARN_ON(prop->type <= DPLL_PIN_TYPE_UNSPEC ||
>+		    prop->type > DPLL_PIN_TYPE_MAX)) {
>+		ret = -EINVAL;
>+		goto release;
>+	}
>+	pin->prop.type = prop->type;
>+	pin->prop.capabilities = prop->capabilities;
>+	pin->prop.freq_supported = prop->freq_supported;
>+	pin->prop.any_freq_min = prop->any_freq_min;
>+	pin->prop.any_freq_max = prop->any_freq_max;
>+	xa_init_flags(&pin->dpll_refs, XA_FLAGS_ALLOC);
>+	xa_init_flags(&pin->parent_refs, XA_FLAGS_ALLOC);
>+	ret = xa_alloc(&dpll_pin_xa, &pin->idx, pin,
>+		       xa_limit_16b, GFP_KERNEL);
>+release:
>+	if (ret) {
>+		xa_destroy(&pin->dpll_refs);
>+		xa_destroy(&pin->parent_refs);
>+		kfree(pin->prop.description);
>+		kfree(pin->rclk_dev_name);
>+		kfree(pin);
>+		return ERR_PTR(ret);
>+	}

This is odd flow. Just return 0 before "release" and have the goto-label
dedicated to error path only.

>+
>+	return pin;
>+}

[...]