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Subject: Re: [PATCH 2/7] irqchip/irq-imgpdc.c: Use
 devm_platform_ioremap_resource()
From:   Marc Zyngier <marc.zyngier@arm.com>
To:     Mukesh Ojha <mojha@codeaurora.org>, tglx@linutronix.de,
        jason@lakedaemon.net, yamada.masahiro@socionext.com,
        linux-arm-kernel@lists.infradead.org, linux-kernel@vger.kernel.org
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Organization: ARM Ltd
Message-ID: <9650cf73-e592-c672-1951-10c137f1a3db@arm.com>
Date:   Mon, 29 Apr 2019 09:24:38 +0100
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Sender: linux-kernel-owner@vger.kernel.org
Precedence: bulk

On 29/04/2019 09:13, Marc Zyngier wrote:
> On 04/04/2019 08:20, Mukesh Ojha wrote:
>> devm_platform_ioremap_resource() internally have platform_get_resource()
>> and devm_ioremap_resource() in it. So instead of calling them separately
>> use devm_platform_ioremap_resource() directly.
>>
>> Signed-off-by: Mukesh Ojha <mojha@codeaurora.org>
>> ---
>>  drivers/irqchip/irq-imgpdc.c | 10 +---------
>>  1 file changed, 1 insertion(+), 9 deletions(-)
>>
>> diff --git a/drivers/irqchip/irq-imgpdc.c b/drivers/irqchip/irq-imgpdc.c
>> index d00489a..8904a5f 100644
>> --- a/drivers/irqchip/irq-imgpdc.c
>> +++ b/drivers/irqchip/irq-imgpdc.c
>> @@ -307,13 +307,6 @@ static int pdc_intc_probe(struct platform_device *pdev)
>>  	if (!node)
>>  		return -ENOENT;
>>  
>> -	/* Get registers */
>> -	res_regs = platform_get_resource(pdev, IORESOURCE_MEM, 0);
>> -	if (res_regs == NULL) {
>> -		dev_err(&pdev->dev, "cannot find registers resource\n");
>> -		return -ENOENT;
>> -	}
>> -
>>  	/* Allocate driver data */
>>  	priv = devm_kzalloc(&pdev->dev, sizeof(*priv), GFP_KERNEL);
>>  	if (!priv) {
>> @@ -324,8 +317,7 @@ static int pdc_intc_probe(struct platform_device *pdev)
>>  	platform_set_drvdata(pdev, priv);
>>  
>>  	/* Ioremap the registers */
>> -	priv->pdc_base = devm_ioremap(&pdev->dev, res_regs->start,
>> -				      resource_size(res_regs));
>> +	priv->pdc_base = devm_platform_ioremap_resource(pdev, 0);
>>  	if (!priv->pdc_base)
>>  		return -EIO;
>>  
>>
> 
> What happens to the res_regs variable then?
> 
> Also, and more importantly, devm_platform_ioremap_resource doesn't
> return NULL on error, but an ERR_PTR. Yes, the bug was already there,
> but since you're changing it, you might as well fix the thing.

Actually, the current code is right, and you're actively breaking it. Boo.

	M.
-- 
Jazz is not dead. It just smells funny...