[PATCH v2] usb: gadget: fsl: Fix unsigned expression compared with zero in fsl_udc_probe

[Leo Li]

> -----Original Message-----
> From: Ye Bin <yebin10 at huawei.com>
> Sent: Monday, August 24, 2020 3:43 AM
> To: Leo Li <leoyang.li at nxp.com>; linux-usb at vger.kernel.org; linuxppc-
> dev at lists.ozlabs.org
> Cc: Ye Bin <yebin10 at huawei.com>
> Subject: [PATCH v2] usb: gadget: fsl: Fix unsigned expression compared with
> zero in fsl_udc_probe
> 
> udc_controller->irq is "unsigned int" always >= 0, but platform_get_irq may
> return little than zero. So "dc_controller->irq < 0" condition is never
> accessible.
> 
> Signed-off-by: Ye Bin <yebin10 at huawei.com>

Acked-by: Li Yang <leoyang.li at nxp.com>

> ---
>  drivers/usb/gadget/udc/fsl_udc_core.c | 7 ++++---
>  1 file changed, 4 insertions(+), 3 deletions(-)
> 
> diff --git a/drivers/usb/gadget/udc/fsl_udc_core.c
> b/drivers/usb/gadget/udc/fsl_udc_core.c
> index a6f7b2594c09..3e98740b8cfc 100644
> --- a/drivers/usb/gadget/udc/fsl_udc_core.c
> +++ b/drivers/usb/gadget/udc/fsl_udc_core.c
> @@ -2439,11 +2439,12 @@ static int fsl_udc_probe(struct platform_device
> *pdev)
>  	/* DEN is bidirectional ep number, max_ep doubles the number */
>  	udc_controller->max_ep = (dccparams & DCCPARAMS_DEN_MASK)
> * 2;
> 
> -	udc_controller->irq = platform_get_irq(pdev, 0);
> -	if (udc_controller->irq <= 0) {
> -		ret = udc_controller->irq ? : -ENODEV;
> +	ret = platform_get_irq(pdev, 0);
> +	if (ret <= 0) {
> +		ret = ret ? : -ENODEV;
>  		goto err_iounmap;
>  	}
> +	udc_controller->irq = ret;
> 
>  	ret = request_irq(udc_controller->irq, fsl_udc_irq, IRQF_SHARED,
>  			driver_name, udc_controller);
> --
> 2.25.4