linux-kernel - Re: [PATCH] usb: gadget: fsl: Fix a wrong judgment in fsl_udc

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Date:   Fri, 10 Apr 2020 12:36:48 +0300
From:   Sergei Shtylyov <sergei.shtylyov@...entembedded.com>
To:     Tang Bin <tangbin@...s.chinamobile.com>, leoyang.li@....com,
        balbi@...nel.org, gregkh@...uxfoundation.org
Cc:     linux-usb@...r.kernel.org, linuxppc-dev@...ts.ozlabs.org,
        linux-kernel@...r.kernel.org, Markus.Elfring@....de,
        Shengju Zhang <zhangshengju@...s.chinamobile.com>
Subject: Re: [PATCH] usb: gadget: fsl: Fix a wrong judgment in fsl_udc_probe()

Hello!

On 10.04.2020 4:58, Tang Bin wrote:

> If the function "platform_get_irq()" failed, the negative value
> returned will not be detected here, including "-EPROBE_DEFER", which
> causes the application to fail to get the correct error message.
> Thus it must be fixed.
> 
> Signed-off-by: Tang Bin <tangbin@...s.chinamobile.com>
> Signed-off-by: Shengju Zhang <zhangshengju@...s.chinamobile.com>
> ---
>   drivers/usb/gadget/udc/fsl_udc_core.c | 4 ++--
>   1 file changed, 2 insertions(+), 2 deletions(-)
> 
> diff --git a/drivers/usb/gadget/udc/fsl_udc_core.c b/drivers/usb/gadget/udc/fsl_udc_core.c
> index ec6eda426..60853ad10 100644
> --- a/drivers/usb/gadget/udc/fsl_udc_core.c
> +++ b/drivers/usb/gadget/udc/fsl_udc_core.c
> @@ -2441,8 +2441,8 @@ static int fsl_udc_probe(struct platform_device *pdev)
>   	udc_controller->max_ep = (dccparams & DCCPARAMS_DEN_MASK) * 2;
>   
>   	udc_controller->irq = platform_get_irq(pdev, 0);
> -	if (!udc_controller->irq) {

    This check has always been wrong, doesn't account for real errors and
probe deferral...

> -		ret = -ENODEV;
> +	if (udc_controller->irq <= 0) {

    Note that platfrom_get_irq() no longer returns 0 on error.

> +		ret = udc_controller->irq ? : -ENODEV;
>   		goto err_iounmap;
>   	}

MBR, Sergei