linux-kernel - Re: usb: gadget: fsl_udc_core: Checking for a failed platform_get_irq() call in fsl_udc

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Message-ID: <CADRPPNRe=YxwjCOYbEjKg4LCOx2suK5WxZp17NJhTm76szdU0w@mail.gmail.com>
Date:   Wed, 8 Apr 2020 17:47:03 -0500
From:   Li Yang <leoyang.li@....com>
To:     Markus Elfring <Markus.Elfring@....de>
Cc:     linux-usb@...r.kernel.org,
        linuxppc-dev <linuxppc-dev@...ts.ozlabs.org>,
        Felipe Balbi <balbi@...nel.org>,
        Tang Bin <tangbin@...s.chinamobile.com>,
        Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
        kernel-janitors@...r.kernel.org,
        LKML <linux-kernel@...r.kernel.org>
Subject: Re: usb: gadget: fsl_udc_core: Checking for a failed
 platform_get_irq() call in fsl_udc_probe()

On Wed, Apr 8, 2020 at 9:19 AM Markus Elfring <Markus.Elfring@....de> wrote:
>
> Hello,
>
> I have taken another look at the implementation of the function “fsl_udc_probe”.
> A software analysis approach points the following source code out for
> further development considerations.
> https://elixir.bootlin.com/linux/v5.6.2/source/drivers/usb/gadget/udc/fsl_udc_core.c#L2443
> https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git/tree/drivers/usb/gadget/udc/fsl_udc_core.c?id=f5e94d10e4c468357019e5c28d48499f677b284f#n2442
>
>         udc_controller->irq = platform_get_irq(pdev, 0);
>         if (!udc_controller->irq) {
>                 ret = -ENODEV;
>                 goto err_iounmap;
>         }
>
>
> The software documentation is providing the following information
> for the used programming interface.
> https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git/tree/drivers/base/platform.c?id=f5e94d10e4c468357019e5c28d48499f677b284f#n221
> https://elixir.bootlin.com/linux/v5.6.2/source/drivers/base/platform.c#L202
>
> “…
>  * Return: IRQ number on success, negative error number on failure.
> …”
>
> Would you like to reconsider the shown condition check?

Thanks for the finding.  This is truly a software issue that need to
be fixed.  Would you submit a patch for it or you want us to fix it?

Regards,
Leo