linux-kernel - Re: [PATCH 0/5] ACPI / scan: Make it possible to use the container hotplug with other scan handlers

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Date:	Sat, 15 Jun 2013 01:20:43 +0200
From:	"Rafael J. Wysocki" <rjw@...k.pl>
To:	Tony Luck <tony.luck@...il.com>
Cc:	Toshi Kani <toshi.kani@...com>,
	ACPI Devel Maling List <linux-acpi@...r.kernel.org>,
	LKML <linux-kernel@...r.kernel.org>,
	"Lu, Aaron" <aaron.lu@...el.com>
Subject: Re: [PATCH 0/5] ACPI / scan: Make it possible to use the container hotplug with other scan handlers

On Friday, June 14, 2013 03:32:42 PM Tony Luck wrote:
> On Fri, Jun 14, 2013 at 3:23 PM, Rafael J. Wysocki <rjw@...k.pl> wrote:
> > Can you please just test patch [5/5] alone without patches [1-4/5]?  We believe
> > that this should work too and if that's the case, we'll only need that patch
> > and a reworked [1/5].
> 
> Your belief is sound - I popped all five patches and then applied just
> 5/5 ... and
> the system still works.

Great, thanks!

Can you please apply the appended patch on top of it and see if the system
still works then?

Rafael


---
From: Rafael J. Wysocki <rafael.j.wysocki@...el.com>
Subject: ACPI / scan: Do not bind ACPI drivers to objects with scan handlers

ACPI drivers must not be bound to device objects having scan handlers
attatched to them, so make acpi_device_probe() fail with -EINVAL if the
device object being probed has an ACPI scan handler.

Signed-off-by: Rafael J. Wysocki <rafael.j.wysocki@...el.com>
---
 drivers/acpi/scan.c  |    3 +++
 drivers/acpi/video.c |    3 ---
 2 files changed, 3 insertions(+), 3 deletions(-)

Index: linux-pm/drivers/acpi/scan.c
===================================================================
--- linux-pm.orig/drivers/acpi/scan.c
+++ linux-pm/drivers/acpi/scan.c
@@ -939,6 +939,9 @@ static int acpi_device_probe(struct devi
 	struct acpi_driver *acpi_drv = to_acpi_driver(dev->driver);
 	int ret;
 
+	if (acpi_dev->handler)
+		return -EINVAL;
+
 	if (!acpi_drv->ops.add)
 		return -ENOSYS;
 
Index: linux-pm/drivers/acpi/video.c
===================================================================
--- linux-pm.orig/drivers/acpi/video.c
+++ linux-pm/drivers/acpi/video.c
@@ -1722,9 +1722,6 @@ static int acpi_video_bus_add(struct acp
 	int error;
 	acpi_status status;
 
-	if (device->handler)
-		return -EINVAL;
-
 	status = acpi_walk_namespace(ACPI_TYPE_DEVICE,
 				device->parent->handle, 1,
 				acpi_video_bus_match, NULL,

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