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Date: Thu, 24 Jan 2013 23:56:50 +0100
From: "Rafael J. Wysocki" <rjw@...k.pl>
To: ACPI Devel Maling List <linux-acpi@...r.kernel.org>
Cc: LKML <linux-kernel@...r.kernel.org>,
Bjorn Helgaas <bhelgaas@...gle.com>,
Yinghai Lu <yinghai@...nel.org>,
Toshi Kani <toshi.kani@...com>, Jiang Liu <liuj97@...il.com>
Subject: [PATCH] ACPI / scan: Make it clear that acpi_bus_trim() cannot fail
From: Rafael J. Wysocki <rafael.j.wysocki@...el.com>
Since acpi_bus_trim() cannot fail, change its definition to a void
function, so that its callers don't check the return value in vain
and update the callers.
Signed-off-by: Rafael J. Wysocki <rafael.j.wysocki@...el.com>
---
On top of current linux-pm.git/linux-next.
Thanks,
Rafael
---
drivers/acpi/dock.c | 8 ++------
drivers/acpi/scan.c | 12 +++---------
drivers/pci/hotplug/acpiphp_glue.c | 10 +++-------
include/acpi/acpi_bus.h | 2 +-
4 files changed, 9 insertions(+), 23 deletions(-)
Index: linux-pm/drivers/acpi/scan.c
===================================================================
--- linux-pm.orig/drivers/acpi/scan.c
+++ linux-pm/drivers/acpi/scan.c
@@ -127,13 +127,8 @@ void acpi_bus_hot_remove_device(void *co
ACPI_DEBUG_PRINT((ACPI_DB_INFO,
"Hot-removing device %s...\n", dev_name(&device->dev)));
- if (acpi_bus_trim(device)) {
- printk(KERN_ERR PREFIX
- "Removing device failed\n");
- goto err_out;
- }
-
- /* device has been freed */
+ acpi_bus_trim(device);
+ /* Device node has been released. */
device = NULL;
/* power off device */
@@ -1656,7 +1651,7 @@ static acpi_status acpi_bus_remove(acpi_
return AE_OK;
}
-int acpi_bus_trim(struct acpi_device *start)
+void acpi_bus_trim(struct acpi_device *start)
{
/*
* Execute acpi_bus_device_detach() as a post-order callback to detach
@@ -1672,7 +1667,6 @@ int acpi_bus_trim(struct acpi_device *st
acpi_walk_namespace(ACPI_TYPE_ANY, start->handle, ACPI_UINT32_MAX, NULL,
acpi_bus_remove, NULL, NULL);
acpi_bus_remove(start->handle, 0, NULL, NULL);
- return 0;
}
EXPORT_SYMBOL_GPL(acpi_bus_trim);
Index: linux-pm/include/acpi/acpi_bus.h
===================================================================
--- linux-pm.orig/include/acpi/acpi_bus.h
+++ linux-pm/include/acpi/acpi_bus.h
@@ -386,7 +386,7 @@ int acpi_bus_register_driver(struct acpi
void acpi_bus_unregister_driver(struct acpi_driver *driver);
int acpi_bus_scan(acpi_handle handle);
void acpi_bus_hot_remove_device(void *context);
-int acpi_bus_trim(struct acpi_device *start);
+void acpi_bus_trim(struct acpi_device *start);
acpi_status acpi_bus_get_ejd(acpi_handle handle, acpi_handle * ejd);
int acpi_match_device_ids(struct acpi_device *device,
const struct acpi_device_id *ids);
Index: linux-pm/drivers/acpi/dock.c
===================================================================
--- linux-pm.orig/drivers/acpi/dock.c
+++ linux-pm/drivers/acpi/dock.c
@@ -336,13 +336,9 @@ static struct acpi_device * dock_create_
static void dock_remove_acpi_device(acpi_handle handle)
{
struct acpi_device *device;
- int ret;
- if (!acpi_bus_get_device(handle, &device)) {
- ret = acpi_bus_trim(device);
- if (ret)
- pr_debug("error removing bus, %x\n", -ret);
- }
+ if (!acpi_bus_get_device(handle, &device))
+ acpi_bus_trim(device);
}
/**
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
@@ -742,8 +742,7 @@ static int acpiphp_bus_add(struct acpiph
/* this shouldn't be in here, so remove
* the bus then re-add it...
*/
- ret_val = acpi_bus_trim(device);
- dbg("acpi_bus_trim return %x\n", ret_val);
+ acpi_bus_trim(device);
}
ret_val = acpi_bus_scan(func->handle);
@@ -772,11 +771,8 @@ static int acpiphp_bus_trim(acpi_handle
return retval;
}
- retval = acpi_bus_trim(device);
- if (retval)
- err("cannot remove from acpi list\n");
-
- return retval;
+ acpi_bus_trim(device);
+ return 0;
}
static void acpiphp_set_acpi_region(struct acpiphp_slot *slot)
--
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