linux-kernel - [PATCH 1/3] ACPI / hotplug / PCI: Always return success after adding a function

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Message-ID: <1502675.WMZKWG2iox@vostro.rjw.lan>
Date:	Mon, 08 Jul 2013 15:28:35 +0200
From:	"Rafael J. Wysocki" <rjw@...k.pl>
To:	Bjorn Helgaas <bhelgaas@...gle.com>
Cc:	LKML <linux-kernel@...r.kernel.org>,
	Linux PCI <linux-pci@...r.kernel.org>,
	ACPI Devel Maling List <linux-acpi@...r.kernel.org>,
	Yinghai Lu <yinghai@...nel.org>, Jiang Liu <liuj97@...il.com>,
	Mika Westerberg <mika.westerberg@...ux.intel.com>
Subject: [PATCH 1/3] ACPI / hotplug / PCI: Always return success after adding a function

From: Rafael J. Wysocki <rafael.j.wysocki@...el.com>

When a new ACPIPHP function is added by register_slot() and the
notify handler cannot be installed for it, register_slot() returns an
error status without cleaning up, which causes the entire namespace
walk in acpiphp_enumerate_slots() to be aborted, although it still
may be possible to successfully install the function notify handler
for other device objects under the given brigde.

To address this issue make register_slot() return success after
a new function has been added, even if the addition of the notify
handler for it has failed.

Signed-off-by: Rafael J. Wysocki <rafael.j.wysocki@...el.com>
---
 drivers/pci/hotplug/acpiphp_glue.c |    5 ++---
 1 file changed, 2 insertions(+), 3 deletions(-)

Index: linux-pm/drivers/pci/hotplug/acpiphp_glue.c
===================================================================
--- linux-pm.orig/drivers/pci/hotplug/acpiphp_glue.c
+++ linux-pm/drivers/pci/hotplug/acpiphp_glue.c
@@ -335,10 +335,9 @@ register_slot(acpi_handle handle, u32 lv
 
 		if (ACPI_FAILURE(status))
 			err("failed to register interrupt notify handler\n");
-	} else
-		status = AE_OK;
+	}
 
-	return status;
+	return AE_OK;
 
  err_exit:
 	bridge->nr_slots--;

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