linux-kernel - Re: [PATCH v2] mfd: intel-lpss: Fix IRQ check

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Date:   Wed, 1 Nov 2023 11:38:28 +0200
From:   Andy Shevchenko <andriy.shevchenko@...ux.intel.com>
To:     Mika Westerberg <mika.westerberg@...ux.intel.com>
Cc:     Chen Ni <nichen@...as.ac.cn>, lee@...nel.org,
        linux-kernel@...r.kernel.org
Subject: Re: [PATCH v2] mfd: intel-lpss: Fix IRQ check

On Wed, Nov 01, 2023 at 09:03:10AM +0200, Mika Westerberg wrote:
> On Wed, Nov 01, 2023 at 06:26:43AM +0000, Chen Ni wrote:
> > platform_get_irq() returns a negative error code to indicating an
> > error. So in intel_lpss_probe() the unset / erroneous IRQ should be
> > returned as is.
> > 
> > Fixes: 4b45efe85263 ("mfd: Add support for Intel Sunrisepoint LPSS devices")

> There is no need for Fixes tag here.

I said that already in v1 :-)

...

> > -	if (!info || !info->mem || info->irq <= 0)
> > +	if (!info || !info->mem)
> 
> This check (info->irq <= 0) covers both "invalid" interrupt numbers
> (that's the negative errno and 0 as no interrupt) so I don't see how
> this change makes it any better and the changelog does not clarify it
> either.

It makes sense. The IRQ here may not be 0. We should actually fix
the PCI code to guarantee that (platform_get_irq() guarantees that
in platform driver).

-- 
With Best Regards,
Andy Shevchenko