netdev - Re: [PATCH v2] isdn: hfc_{pci,sx}: Avoid empty body if statements

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Date:   Thu, 18 Oct 2018 17:50:58 -0700 (PDT)
From:   David Miller <davem@...emloft.net>
To:     natechancellor@...il.com
Cc:     isdn@...ux-pingi.de, netdev@...r.kernel.org,
        linux-kernel@...r.kernel.org, yamada.masahiro@...ionext.com
Subject: Re: [PATCH v2] isdn: hfc_{pci,sx}: Avoid empty body if statements

From: Nathan Chancellor <natechancellor@...il.com>
Date: Thu, 18 Oct 2018 17:42:51 -0700

> On Thu, Oct 18, 2018 at 05:23:10PM -0700, David Miller wrote:
>> From: Nathan Chancellor <natechancellor@...il.com>
>> Date: Thu, 18 Oct 2018 17:21:17 -0700
>> 
>> > Thanks for the review, I went ahead and compiled with the following diff
>> > on top of v2 and got no warnings from Clang, GCC, or sparse, does this
>> > seem satisfactory for v3?
>> 
>> Well, one thing I notice.
>> 
> 
>> > @@ -86,7 +86,7 @@ release_io_hfcpci(struct IsdnCardState *cs)
>> >         pci_free_consistent(cs->hw.hfcpci.dev, 0x8000,
>> >                             cs->hw.hfcpci.fifos, cs->hw.hfcpci.dma);
>> >         cs->hw.hfcpci.fifos = NULL;
>> > -       iounmap((void *)cs->hw.hfcpci.pci_io);
>> > +       iounmap(cs->hw.hfcpci.pci_io);
>> >  }
>> 
>> Driver uses iounmap().
>> 
>> > @@ -1692,7 +1692,7 @@ setup_hfcpci(struct IsdnCard *card)
>> >                 printk(KERN_WARNING "HFC-PCI: No IRQ for PCI card found\n");
>> >                 return (0);
>> >         }
>> > -       cs->hw.hfcpci.pci_io = (char *)(unsigned long)dev_hfcpci->resource[1].start;
>> > +       cs->hw.hfcpci.pci_io = (void __iomem *)(unsigned long)dev_hfcpci->resource[1].start;
>> >         printk(KERN_INFO "HiSax: HFC-PCI card manufacturer: %s card name: %s\n", id_list[i].vendor_name, id_list[i].card_name);
>> 
>> But does not use iomap().  You won't need any cast here if it did use
>> iomap() properly.
>> 
>> Thanks.
> 
> So this?

That's definitely a lot better, yes!

I wonder what exactly it is checking there though.  I guess it wants to see if the
resource->start value is zero and bail with an error it so.

Anyways, this code has been like this for ages and what you are proposing is
definitely a significant improvement.

Thanks.