linux-kernel - Re: [PATCH v8 2/4] ARM: mediatek: Add sysirq interrupt polarity support

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Date:	Sat, 29 Nov 2014 18:40:31 +0100
From:	Beniamino Galvani <b.galvani@...il.com>
To:	Yingjoe Chen <yingjoe.chen@...iatek.com>
Cc:	Mark Rutland <mark.rutland@....com>,
	Jason Cooper <jason@...edaemon.net>,
	Thomas Gleixner <tglx@...utronix.de>,
	Jiang Liu <jiang.liu@...ux.intel.com>,
	Marc Zyngier <marc.zyngier@....com>,
	Boris BREZILLON <boris.brezillon@...e-electrons.com>,
	Bjorn Helgaas <bhelgaas@...gle.com>,
	Russell King <linux@....linux.org.uk>,
	Pawel Moll <pawel.moll@....com>, srv_heupstream@...iatek.com,
	devicetree@...r.kernel.org, hc.yen@...iatek.com,
	yh.chen@...iatek.com, linux-kernel@...r.kernel.org,
	Yijing Wang <wangyijing@...wei.com>,
	Rob Herring <robh+dt@...nel.org>,
	Matthias Brugger <matthias.bgg@...il.com>,
	nathan.chung@...iatek.com, Sascha Hauer <kernel@...gutronix.de>,
	Grant Likely <grant.likely@...aro.org>,
	eddie.huang@...iatek.com, yingjoe.chen@...il.com,
	linux-arm-kernel@...ts.infradead.org
Subject: Re: [PATCH v8 2/4] ARM: mediatek: Add sysirq interrupt polarity
 support

On Tue, Nov 25, 2014 at 04:04:20PM +0800, Yingjoe Chen wrote:
> Mediatek SoCs have interrupt polarity support in sysirq which
> allows to invert polarity for given interrupt. Add this support
> using hierarchy irq domain.
>
> [...]
> 
> +static int __init mtk_sysirq_of_init(struct device_node *node,
> +				     struct device_node *parent)
> +{
> +	struct irq_domain *domain, *domain_parent;
> +	struct mtk_sysirq_chip_data *chip_data;
> +	int ret = 0;
> +
> +	domain_parent = irq_find_host(parent);
> +	if (!domain_parent) {
> +		pr_err("mtk_sysirq: interrupt-parent not found\n");
> +		return -EINVAL;
> +	}
> +
> +	chip_data = kzalloc(sizeof(*chip_data), GFP_KERNEL);
> +	if (!chip_data)
> +		return -ENOMEM;
> +
> +	chip_data->intpol_base = of_io_request_and_map(node, 0, "intpol");
> +	if (!chip_data->intpol_base) {

Hi,

you should use IS_ERR() to check the return value here.

Beniamino
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