linux-kernel - Re: [PATCH 1/2] gpio: amd8111: Convert PCIBIOS

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Message-ID: <ZlhHJHJOHKqoea_N@surfacebook.localdomain>
Date: Thu, 30 May 2024 12:30:12 +0300
From: Andy Shevchenko <andy.shevchenko@...il.com>
To: Dan Carpenter <dan.carpenter@...aro.org>
Cc: Ilpo Järvinen <ilpo.jarvinen@...ux.intel.com>,
	Linus Walleij <linus.walleij@...aro.org>,
	Bartosz Golaszewski <brgl@...ev.pl>,
	Dmitry Baryshkov <dbaryshkov@...il.com>, linux-gpio@...r.kernel.org,
	linux-kernel@...r.kernel.org, stable@...r.kernel.org
Subject: Re: [PATCH 1/2] gpio: amd8111: Convert PCIBIOS_* return codes to
 errnos

Mon, May 27, 2024 at 05:02:12PM +0300, Dan Carpenter kirjoitti:
> On Mon, May 27, 2024 at 04:23:44PM +0300, Ilpo Järvinen wrote:
> > diff --git a/drivers/gpio/gpio-amd8111.c b/drivers/gpio/gpio-amd8111.c
> > index 6f3ded619c8b..3377667a28de 100644
> > --- a/drivers/gpio/gpio-amd8111.c
> > +++ b/drivers/gpio/gpio-amd8111.c
> > @@ -195,8 +195,10 @@ static int __init amd_gpio_init(void)
> >  
> >  found:
> >  	err = pci_read_config_dword(pdev, 0x58, &gp.pmbase);
> > -	if (err)
> > +	if (err) {
> > +		err = pcibios_err_to_errno(err);
> 
> The patch is correct, but is the CC to stable necessary?  Is this a real
> concern?
> 
> Most callers don't check.  Linus Torvalds, once said something to the
> effect that if your PCI bus starts failing, there isn't anything the
> operating system can do, so checking is pointless.  The only fix is to
> buy new hardware.  There was a hotpluggable PCI back in the day but I
> don't think it exists any more.

Now we have a USB4 that can tunnel PCIe, I'm not sure no generation of it may
not fail with the errors that are listed as positive PCI bus specific codes.

And it's hotpluggable, of course.

-- 
With Best Regards,
Andy Shevchenko