linux-kernel - Re: [PATCH v3] isdn: hfc_{pci,sx}: Avoid empty body if statements

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Date:   Mon, 22 Oct 2018 19:25:07 -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 v3] isdn: hfc_{pci,sx}: Avoid empty body if statements

From: Nathan Chancellor <natechancellor@...il.com>
Date: Thu, 18 Oct 2018 18:11:04 -0700

> Clang warns:
> 
> drivers/isdn/hisax/hfc_pci.c:131:34: error: if statement has empty body
> [-Werror,-Wempty-body]
>         if (Read_hfc(cs, HFCPCI_INT_S1));
>                                         ^
> drivers/isdn/hisax/hfc_pci.c:131:34: note: put the semicolon on a
> separate line to silence this warning
> 
> In my attempt to hide the warnings because I thought they didn't serve
> any purpose[1], Masahiro Yamada pointed out that {Read,Write}_hfc in
> hci_pci.c should be using a standard register access method; otherwise,
> the compiler will just remove the if statements.
> 
> For hfc_pci, use the versions of {Read,Write}_hfc found in
> drivers/isdn/hardware/mISDN/hfc_pCI.h while converting pci_io to be
> 'void __iomem *' (and clean up ioremap) then remove the empty if
> statements.
> 
> For hfc_sx, {Read,Write}_hfc are already use a proper register accessor
> (inb, outb) so just remove the unnecessary if statements.
> 
> [1]: https://lore.kernel.org/lkml/20181016021454.11953-1-natechancellor@gmail.com/
> 
> Link: https://github.com/ClangBuiltLinux/linux/issues/66
> Suggested-by: Masahiro Yamada <yamada.masahiro@...ionext.com>
> Signed-off-by: Nathan Chancellor <natechancellor@...il.com>

Applied.