linux-kernel - Re: [PATCH v8 4/5] usb: ehci: Add new EHCI driver for Broadcom STB SoC's

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Date:   Sat, 9 May 2020 15:04:26 +0300
From:   Andy Shevchenko <andy.shevchenko@...il.com>
To:     Alan Stern <stern@...land.harvard.edu>
Cc:     Al Cooper <alcooperx@...il.com>,
        Linux Kernel Mailing List <linux-kernel@...r.kernel.org>,
        bcm-kernel-feedback-list <bcm-kernel-feedback-list@...adcom.com>,
        devicetree <devicetree@...r.kernel.org>,
        Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
        Krzysztof Kozlowski <krzk@...nel.org>,
        USB <linux-usb@...r.kernel.org>,
        Mathias Nyman <mathias.nyman@...el.com>,
        Rob Herring <robh+dt@...nel.org>,
        Yoshihiro Shimoda <yoshihiro.shimoda.uh@...esas.com>,
        Andy Shevchenko <andriy.shevchenko@...ux.intel.com>
Subject: Re: [PATCH v8 4/5] usb: ehci: Add new EHCI driver for Broadcom STB SoC's

On Sat, May 9, 2020 at 3:47 AM Alan Stern <stern@...land.harvard.edu> wrote:
> On Fri, 8 May 2020, Al Cooper wrote:

...

> > +     irq = platform_get_irq(pdev, 0);
> > +     if (irq <= 0)
> > +             return irq;
>
> I don't want to get involved in the question of whether or not 0 is a
> valid IRQ number.  The consensus has gone back and forth over the
> years, and it just doesn't seem important.
>
> However, as Sergei points out, if 0 is going to be regarded as an
> invalid value then we shouldn't return 0 from the probe function here.

The most of the drivers rely on the fact that on platforms where it's
the case (yes, we have you-know-which architecture has some legacy
stuff there) request_irq() will fail anyway.

> I'll leave the decision on how to handle this matter up to Greg.  :-)

Me too.

-- 
With Best Regards,
Andy Shevchenko