linux-kernel - Re: [PATCH] pci: introduce common pci config space accessors

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Message-ID: <CAL_JsqKoMHDmTjbZdoTD9gCO5x8Yqw3+8tofJ=MB0RbasnCPtQ@mail.gmail.com>
Date:	Mon, 5 Jan 2015 13:26:07 -0600
From:	Rob Herring <robh@...nel.org>
To:	Andreas Mohr <andi@...as.de>
Cc:	"linux-pci@...r.kernel.org" <linux-pci@...r.kernel.org>,
	"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
	Bjorn Helgaas <bhelgaas@...gle.com>,
	Will Deacon <will.deacon@....com>,
	Arnd Bergmann <arnd@...db.de>
Subject: Re: [PATCH] pci: introduce common pci config space accessors

On Mon, Jan 5, 2015 at 12:48 PM, Andreas Mohr <andi@...as.de> wrote:
> Hi,
>
>> +     if (size == 1)
>> +             *val = readb(addr);
>> +     else if (size == 2)
>> +             *val = readw(addr);
>> +     else
>> +             *val = readl(addr);
> (pci_generic_config_read() and pci_generic_config_write())
>
> switch()
> default: WARN_ON(1);
> ?

If you look at PCI_OP_READ/PCI_OP_WRITE defines, the caller can only
have size of 1, 2 or 4. AFAIK, config accesses don't go thru any other
caller.

Rob
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