From: Rafael J. Wysocki <rafael.j.wyso...@intel.com>
Redefine acpi_companion_match() to return an ACPI device object
pointer instead of a bool and use it to remove some redundant code
from acpi_match_device().
Signed-off-by: Rafael J. Wysocki <rafael.j.wyso...@intel.com>
---
drivers/acpi/scan.c | 30 +++++++++++-------------------
1 file changed, 11 insertions(+), 19 deletions(-)
Index: linux-pm/drivers/acpi/scan.c
===================================================================
--- linux-pm.orig/drivers/acpi/scan.c
+++ linux-pm/drivers/acpi/scan.c
@@ -194,7 +194,8 @@ static int create_modalias(struct acpi_d
*
* Check if the given device has an ACPI companion and if that companion has
* a valid list of PNP IDs, and if the device is the first (primary) physical
- * device associated with it.
+ * device associated with it. Return the companion pointer if that's the case
+ * or NULL otherwise.
*
* If multiple physical devices are attached to a single ACPI companion, we
need
* to be careful. The usage scenario for this kind of relationship is that all
@@ -208,31 +209,31 @@ static int create_modalias(struct acpi_d
* resources available from it but they will be matched normally using
functions
* provided by their bus types (and analogously for their modalias).
*/
-static bool acpi_companion_match(const struct device *dev)
+static struct acpi_device *acpi_companion_match(const struct device *dev)
{
struct acpi_device *adev;
- bool ret;
adev = ACPI_COMPANION(dev);
if (!adev)
- return false;
+ return NULL;
if (list_empty(&adev->pnp.ids))
- return false;
+ return NULL;
mutex_lock(&adev->physical_node_lock);
if (list_empty(&adev->physical_node_list)) {
- ret = false;
+ adev = NULL;
} else {
const struct acpi_device_physical_node *node;
node = list_first_entry(&adev->physical_node_list,
struct acpi_device_physical_node, node);
- ret = node->dev == dev;
+ if (node->dev != dev)
+ adev = NULL;
}
mutex_unlock(&adev->physical_node_lock);
- return ret;
+ return adev;
}
/*
@@ -908,7 +909,7 @@ static const struct acpi_device_id *__ac
* If the device is not present, it is unnecessary to load device
* driver for it.
*/
- if (!device->status.present)
+ if (!device || !device->status.present)
return NULL;
for (id = ids; id->id[0]; id++)
@@ -933,16 +934,7 @@ static const struct acpi_device_id *__ac
const struct acpi_device_id *acpi_match_device(const struct acpi_device_id
*ids,
const struct device *dev)
{
- struct acpi_device *adev;
- acpi_handle handle = ACPI_HANDLE(dev);
-
- if (!ids || !handle || acpi_bus_get_device(handle, &adev))
- return NULL;
-
- if (!acpi_companion_match(dev))
- return NULL;
-
- return __acpi_match_device(adev, ids);
+ return __acpi_match_device(acpi_companion_match(dev), ids);
}
EXPORT_SYMBOL_GPL(acpi_match_device);
--
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