From: Bjorn Helgaas <helgaas@kernel.org>
To: John Garry <john.garry@huawei.com>
Cc: Niklas Schnelle <schnelle@linux.ibm.com>,
Mauro Carvalho Chehab <mchehab@kernel.org>,
Arnd Bergmann <arnd@arndb.de>,
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Subject: Re: [RFC 01/32] Kconfig: introduce and depend on LEGACY_PCI
Date: Thu, 6 Jan 2022 12:14:09 -0600 [thread overview]
Message-ID: <20220106181409.GA297735@bhelgaas> (raw)
In-Reply-To: <74bf4fde-3972-1c36-ca04-58089da0d82b@huawei.com>
On Thu, Jan 06, 2022 at 05:41:00PM +0000, John Garry wrote:
> On 05/01/2022 19:47, Bjorn Helgaas wrote:
> > IMO inb() should
> > be present but do something innocuous like return ~0, as it would if
> > I/O port space is supported but there's no device at that address.
> >
> > [1]https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git/tree/drivers/scsi/megaraid.c?id=v5.15#n4210
> >
>
> That driver would prob not be used on systems which does not support PIO,
> and so could have a HAS_IOPORT dependency. But it is not strictly necessary.
I don't want the path of "this driver isn't needed because the device
is unlikely to be used on this arch."
Maybe it's not _always_ possible, but if the device can be plugged
into the platform, I think we should be able to build the driver for
it.
If the device requires I/O port space and the platform doesn't support
it, the PCI core or the driver should detect that and give a useful
diagnostic.
Bjorn
next prev parent reply other threads:[~2022-01-06 18:14 UTC|newest]
Thread overview: 23+ messages / expand[flat|nested] mbox.gz Atom feed top
[not found] <20211227164317.4146918-1-schnelle@linux.ibm.com>
2021-12-27 16:42 ` [RFC 01/32] Kconfig: introduce and depend on LEGACY_PCI Niklas Schnelle
2021-12-27 17:48 ` Guenter Roeck
2021-12-28 2:09 ` Mauro Carvalho Chehab
2021-12-28 8:21 ` Greg Kroah-Hartman
2021-12-28 9:15 ` Mauro Carvalho Chehab
2021-12-28 10:58 ` Niklas Schnelle
2021-12-28 12:01 ` Greg Kroah-Hartman
2021-12-28 12:54 ` Mauro Carvalho Chehab
2021-12-28 15:06 ` Niklas Schnelle
2021-12-28 17:12 ` Mauro Carvalho Chehab
2021-12-29 11:45 ` Niklas Schnelle
2021-12-29 12:12 ` Mauro Carvalho Chehab
2021-12-29 16:03 ` Bjorn Helgaas
2021-12-29 16:55 ` Niklas Schnelle
2022-01-05 17:42 ` John Garry
2022-01-05 19:47 ` Bjorn Helgaas
2022-01-06 17:41 ` John Garry
2022-01-06 18:14 ` Bjorn Helgaas [this message]
2022-01-07 17:16 ` John Garry
2022-01-10 9:34 ` Niklas Schnelle
2021-12-27 16:42 ` [RFC 07/32] Input: gameport: add ISA and HAS_IOPORT dependencies Niklas Schnelle
2021-12-27 16:42 ` [RFC 11/32] Input: Kconfig: add " Niklas Schnelle
2021-12-28 10:23 ` Geert Uytterhoeven
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