linux-kernel - Re: [DO NOT MERGE v5 16/37] irqchip: Add SH7751 INTC driver

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Message-ID: <874jgssnhz.ffs@tglx>
Date:   Fri, 08 Dec 2023 16:49:28 +0100
From:   Thomas Gleixner <tglx@...utronix.de>
To:     Yoshinori Sato <ysato@...rs.sourceforge.jp>,
        linux-sh@...r.kernel.org
Cc:     Yoshinori Sato <ysato@...rs.sourceforge.jp>,
        Damien Le Moal <dlemoal@...nel.org>,
        Rob Herring <robh+dt@...nel.org>,
        Krzysztof Kozlowski <krzysztof.kozlowski+dt@...aro.org>,
        Conor Dooley <conor+dt@...nel.org>,
        Geert Uytterhoeven <geert+renesas@...der.be>,
        Michael Turquette <mturquette@...libre.com>,
        Stephen Boyd <sboyd@...nel.org>,
        David Airlie <airlied@...il.com>,
        Daniel Vetter <daniel@...ll.ch>,
        Maarten Lankhorst <maarten.lankhorst@...ux.intel.com>,
        Maxime Ripard <mripard@...nel.org>,
        Thomas Zimmermann <tzimmermann@...e.de>,
        Lorenzo Pieralisi <lpieralisi@...nel.org>,
        Krzysztof Wilczyński <kw@...ux.com>,
        Bjorn Helgaas <bhelgaas@...gle.com>,
        Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
        Jiri Slaby <jirislaby@...nel.org>,
        Magnus Damm <magnus.damm@...il.com>,
        Daniel Lezcano <daniel.lezcano@...aro.org>,
        Rich Felker <dalias@...c.org>,
        John Paul Adrian Glaubitz <glaubitz@...sik.fu-berlin.de>,
        Lee Jones <lee@...nel.org>, Helge Deller <deller@....de>,
        Heiko Stuebner <heiko@...ech.de>,
        Jernej Skrabec <jernej.skrabec@...il.com>,
        Chris Morgan <macromorgan@...mail.com>,
        Linus Walleij <linus.walleij@...aro.org>,
        Randy Dunlap <rdunlap@...radead.org>,
        Arnd Bergmann <arnd@...db.de>,
        Hyeonggon Yoo <42.hyeyoo@...il.com>,
        David Rientjes <rientjes@...gle.com>,
        Vlastimil Babka <vbabka@...e.cz>, Baoquan He <bhe@...hat.com>,
        Andrew Morton <akpm@...ux-foundation.org>,
        Guenter Roeck <linux@...ck-us.net>,
        Stephen Rothwell <sfr@...b.auug.org.au>,
        Guo Ren <guoren@...nel.org>,
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        Azeem Shaikh <azeemshaikh38@...il.com>,
        Palmer Dabbelt <palmer@...osinc.com>,
        Bin Meng <bmeng@...ylab.org>,
        Max Filippov <jcmvbkbc@...il.com>, Tom Rix <trix@...hat.com>,
        Herve Codina <herve.codina@...tlin.com>,
        Jacky Huang <ychuang3@...oton.com>,
        Lukas Bulwahn <lukas.bulwahn@...il.com>,
        Jonathan Corbet <corbet@....net>,
        Biju Das <biju.das.jz@...renesas.com>,
        Uwe Kleine-König 
        <u.kleine-koenig@...gutronix.de>, Sam Ravnborg <sam@...nborg.org>,
        Michael Karcher <kernel@...rcher.dialup.fu-berlin.de>,
        Sergey Shtylyov <s.shtylyov@....ru>,
        Laurent Pinchart <laurent.pinchart+renesas@...asonboard.com>,
        linux-ide@...r.kernel.org, devicetree@...r.kernel.org,
        linux-kernel@...r.kernel.org, linux-renesas-soc@...r.kernel.org,
        linux-clk@...r.kernel.org, dri-devel@...ts.freedesktop.org,
        linux-pci@...r.kernel.org, linux-serial@...r.kernel.org,
        linux-fbdev@...r.kernel.org
Subject: Re: [DO NOT MERGE v5 16/37] irqchip: Add SH7751 INTC driver

On Tue, Dec 05 2023 at 18:45, Yoshinori Sato wrote:
> +static void endisable_irq(struct irq_data *data, int enable)

bool enable?

> +{
> +	struct sh7751_intc_priv *priv;
> +	unsigned int irq;
> +
> +	priv = irq_data_to_priv(data);
> +
> +	irq = irqd_to_hwirq(data);
> +	if (!is_valid_irq(irq)) {
> +		/* IRQ out of range */
> +		pr_warn_once("%s: IRQ %u is out of range\n", __FILE__, irq);
> +		return;
> +	}
> +
> +	if (irq <= MAX_IRL && !priv->irlm)
> +		/* IRL encoded external interrupt */
> +		/* disable for SR.IMASK */
> +		update_sr_imask(irq - IRQ_START, enable);
> +	else
> +		/* Internal peripheral interrupt */
> +		/* mask for IPR priority 0 */
> +		update_ipr(priv, irq, enable);

Lacks curly brackets on the if/else

> +static int irq_sh7751_map(struct irq_domain *h, unsigned int virq,
> +			  irq_hw_number_t hw_irq_num)
> +{
> +	irq_set_chip_and_handler(virq, &sh7751_irq_chip, handle_level_irq);
> +	irq_get_irq_data(virq)->chip_data = h->host_data;
> +	irq_modify_status(virq, IRQ_NOREQUEST, IRQ_NOPROBE);
> +	return 0;
> +}
> +static const struct irq_domain_ops irq_ops = {

Newline before 'static ...'

> +	.map    = irq_sh7751_map,
> +	.xlate  = irq_domain_xlate_onecell,
> +};
> +
> +static int __init load_ipr_map(struct device_node *intc,
> +			       struct sh7751_intc_priv *priv)
> +{
> +	struct property *ipr_map;
> +	unsigned int num_ipr, i;
> +	struct ipr *ipr;
> +	const __be32 *p;
> +	u32 irq;
> +
> +	ipr_map = of_find_property(intc, "renesas,ipr-map", &num_ipr);
> +	if (IS_ERR(ipr_map))
> +		return PTR_ERR(ipr_map);
> +	num_ipr /= sizeof(u32);
> +	/* 3words per entry. */
> +	if (num_ipr % 3)

Three words per ... But you can spare the comment by doing:

        if (num_ipr % WORDS_PER_ENTRY)

> +		goto error1;
> +	num_ipr /= 3;
> +static int __init sh7751_intc_of_init(struct device_node *intc,
> +				      struct device_node *parent)
> +{
> +	struct sh7751_intc_priv *priv;
> +	void __iomem *base, *base2;
> +	struct irq_domain *domain;
> +	u16 icr;
> +	int ret;
> +
> +	base = of_iomap(intc, 0);
> +	base2 = of_iomap(intc, 1);
> +	if (!base || !base2) {
> +		pr_err("%pOFP: Invalid register definition\n", intc);

What unmaps 'base' if 'base' is valid and base2 == NULL?

> +		return -EINVAL;
> +	}
> +
> +	priv = kzalloc(sizeof(struct sh7751_intc_priv), GFP_KERNEL);
> +	if (priv == NULL)
> +		return -ENOMEM;

Leaks base[2] maps, no?

> +	ret = load_ipr_map(intc, priv);
> +	if (ret < 0) {
> +		kfree(priv);
> +		return ret;
> +	}
> +
> +	priv->base = base;
> +	priv->intpri00 = base2;
> +
> +	if (of_property_read_bool(intc, "renesas,irlm")) {
> +		priv->irlm = true;
> +		icr = __raw_readw(priv->base + R_ICR);
> +		icr |= ICR_IRLM;
> +		__raw_writew(icr, priv->base + R_ICR);
> +	}
> +
> +	domain = irq_domain_add_linear(intc, NR_IRQS, &irq_ops, priv);
> +	if (domain == NULL) {
> +		pr_err("%pOFP: cannot initialize irq domain\n", intc);
> +		kfree(priv);
> +		return -ENOMEM;
> +	}
> +
> +	irq_set_default_host(domain);
> +	pr_info("%pOFP: SH7751 Interrupt controller (%s external IRQ)",
> +		intc, priv->irlm ? "4 lines" : "15 level");
> +	return 0;
> +}
> +
> +IRQCHIP_DECLARE(sh_7751_intc,
> +		"renesas,sh7751-intc", sh7751_intc_of_init);

One line please.

Thanks,

        tglx