linux-kernel - Re: [PATCH 1/16] ACPI: Separate adding ACPI device objects from probing ACPI drivers

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Message-ID: <6935441.WoipOdx2kz@vostro.rjw.lan>
Date:	Fri, 11 Jan 2013 21:58:50 +0100
From:	"Rafael J. Wysocki" <rjw@...k.pl>
To:	Mika Westerberg <mika.westerberg@...ux.intel.com>
Cc:	ACPI Devel Maling List <linux-acpi@...r.kernel.org>,
	Toshi Kani <toshi.kani@...com>,
	Bjorn Helgaas <bhelgaas@...gle.com>,
	LKML <linux-kernel@...r.kernel.org>, linux-pci@...r.kernel.org,
	Yinghai Lu <yinghai@...nel.org>,
	Myron Stowe <myron.stowe@...hat.com>,
	Yijing Wang <wangyijing0307@...il.com>,
	Jiang Liu <liuj97@...il.com>
Subject: Re: [PATCH 1/16] ACPI: Separate adding ACPI device objects from probing ACPI drivers

On Friday, January 11, 2013 10:37:59 PM Mika Westerberg wrote:
> On Fri, Jan 11, 2013 at 09:31:43PM +0100, Rafael J. Wysocki wrote:
> > From: Rafael J. Wysocki <rafael.j.wysocki@...el.com>
> > Subject: ACPI / scan: Fix check of device_attach() return value.
> > 
> > Since device_attach() returns 1 on success and 0 on failure,
> > the check against its return value in acpi_bus_device_attach()
> > should be reveresed.  Make it so.
> 
> Not sure if it matters but it returns 0 if no device was bound to a driver
> and -ENODEV in case of error. If we only want to terminate in case of
> error, following might be better.
> 
> 	} else if (device_attach(&device->dev) < 0) {

Yes, this check will be better.

Which means that the patch is actually yours, so I've just added the changelog. :-)

Thanks,
Rafael


---
From: Mika Westerberg <mika.westerberg@...ux.intel.com>
Subject: ACPI / scan: Fix check of device_attach() return value.

Since device_attach() returns 1 on success (a driver has been bound
to the device), the check against its return value in
acpi_bus_device_attach() should modified to take that into accout.
Make it so.

[rjw: Subject and changelog.]
Signed-off-by: Mika Westerberg <mika.westerberg@...ux.intel.com>
---
 drivers/acpi/scan.c |    2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

Index: linux-pm/drivers/acpi/scan.c
===================================================================
--- linux-pm.orig/drivers/acpi/scan.c
+++ linux-pm/drivers/acpi/scan.c
@@ -1598,7 +1598,7 @@ static acpi_status acpi_bus_device_attac
 	if (!acpi_match_device_ids(device, acpi_platform_device_ids)) {
 		/* This is a known good platform device. */
 		acpi_create_platform_device(device);
-	} else if (device_attach(&device->dev)) {
+	} else if (device_attach(&device->dev) < 0) {
 		status = AE_CTRL_DEPTH;
 	}
 	return status;

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