Re: [PATCH 4/7 v2] net: ethernet: i825xx: Fix platform_get_irq's error checking

[arvindY]

Hi David,

On Wednesday 06 December 2017 05:49 PM, Sergei Shtylyov wrote:
> On 12/05/2017 06:49 PM, David Miller wrote:
>
> > > > From: Arvind Yadav <arvind.yadav.cs@xxxxxxxxx>
> > > > Date: Mon,  4 Dec 2017 23:18:20 +0530
> > > >
> > > > > @@ -120,9 +120,10 @@ static int sni_82596_probe(struct 
> > > > > platform_device
> > > > > *dev)
> > > > >        netdevice->dev_addr[5] = readb(eth_addr + 0x06);
> > > > >        iounmap(eth_addr);
> > > > >    -    if (!netdevice->irq) {
> > > > > +    if (netdevice->irq <= 0) {
> > > > >            printk(KERN_ERR "%s: IRQ not found for i82596 at 0x%lx\n",
> > > > >                __FILE__, netdevice->base_addr);
> > > > > +        retval = netdevice->irq ? netdevice->irq : -ENODEV;
> > > > >            goto probe_failed;
> > > > >        }
> > > > Ok, thinking about this some more...
> > > >
> > > > It is impossible to use platform_get_irq() without every single call
> > > > site having this funny:
> > > >
> > > >     ret = val ? val : -ENODEV;
> > > >
> > > > sequence.
> > > >
> > > > This is unnecessary duplication and it is also error prone, so I
> > > > really think this logic belongs in platform_get_irq() itself.  It can
> > > > convert '0' to -ENODEV and that way we need no special logic in the
> > > > callers at all.
> > > platform_get_irq() will return 0 only for sparc, If sparc initialize
> > > platform
> > > data irq[PROMINTR_MAX] as zero. Otherwise platform_get_irq() will
> > > never return
> > > 0. It will return either IRQ number or error (as negative number). But
> > > I am getting
> > > review comment by reviewer/maintainer in other subsystem to add check
> > > for
> > > zero. So I have done same changes here. Please correct me if i am
> > > wrong.
> >
> > If you make the change that I suggest, you instead can check for
>
>    I assume such change is needed only for the SPARC-specific section 
> of platform_get_irq()?
>
> > '-ENODEV' to mean no IRQ.
>
>    No specific error check is needed, just irq < 0 check should be 
> enough...
> Also, looking at platform_get_irq(), -ENXIO should be returned in this 
> case.
>
> MBR, Sergei
Is it ok. If We will add a check for only < 0.

Regards
Arvind