linux-kernel - Re: Input: ep93xx_keypad: Checking for a failed platform_get_irq()call in ep93xx_keypad

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Date:   Fri, 10 Apr 2020 10:52:50 +0800
From:   Tang Bin <tangbin@...s.chinamobile.com>
To:     Dmitry Torokhov <dmitry.torokhov@...il.com>,
        Markus Elfring <Markus.Elfring@....de>
Cc:     linux-input@...r.kernel.org, Allison Randal <allison@...utok.net>,
        Arnd Bergmann <arnd@...db.de>,
        H Hartley Sweeten <hsweeten@...ionengravers.com>,
        Olof Johansson <olof@...om.net>,
        Thomas Gleixner <tglx@...utronix.de>,
        LKML <linux-kernel@...r.kernel.org>,
        kernel-janitors@...r.kernel.org
Subject: Re: Input: ep93xx_keypad: Checking for a failed
 platform_get_irq()call in ep93xx_keypad_probe()

Hi Dmitry:

On 2020/4/10 4:48, Dmitry Torokhov wrote:
> Platform code historically allowed creating IRQ resources with IRQ
> number 0 to indicate "no interrupt assigned", so this driver tries to
> filter out such conditions. The negative IRQs (errors) will be rejected
> by request_irq() but I guess we can lose -EPROBE_DEFER. We could do
>
> 	if (keypad->irq <= 0) {
> 		err = keypad->irq ?: -ENXIO : keypad->irq;
> 		goto failed_free;
> 	}
>
>
I have been aware of this problem for a few days, and by doing 
experiments on the hardware, I have found the following ways that maybe 
suitable：

     if (keypad->irq <= 0) {
         err = keypad->irq ? : -ENXIO;
         goto failed_free;
     }
     or
     if (keypad->irq <= 0) {
         err = keypad->irq < 0 ? keypad->irq : -ENXIO;
         goto failed_free;
     }

If you think it's usefull, I will send this patch to fix it.

Thanks

Tang Bin


>