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authorRafael J. Wysocki <rafael.j.wysocki@intel.com>2022-06-13 21:10:03 +0300
committerRafael J. Wysocki <rafael.j.wysocki@intel.com>2022-06-20 21:28:48 +0300
commit2f6fe93fede802acfe010752db461ccd34745745 (patch)
tree1f4dd186389ec16e1d184ffa06b7efd8393ee79a /drivers/acpi
parentf5122be80daad8e53e6876add5ccbf9db7ca809c (diff)
downloadlinux-2f6fe93fede802acfe010752db461ccd34745745.tar.xz
ACPI: glue: Introduce acpi_find_child_by_adr()
Rearrange the ACPI device lookup code used internally by acpi_find_child_device() so it can avoid extra checks after finding one object with a matching _ADR and use it for defining acpi_find_child_by_adr() that will allow the callers to find a given ACPI device's child matching a given bus address without doing any other checks in check_one_child(). Signed-off-by: Rafael J. Wysocki <rafael.j.wysocki@intel.com> Reviewed-by: Andy Shevchenko <andriy.shevchenko@linux.intel.com>
Diffstat (limited to 'drivers/acpi')
-rw-r--r--drivers/acpi/glue.c28
1 files changed, 24 insertions, 4 deletions
diff --git a/drivers/acpi/glue.c b/drivers/acpi/glue.c
index 5203a7c60daa..204fe94c7e45 100644
--- a/drivers/acpi/glue.c
+++ b/drivers/acpi/glue.c
@@ -119,6 +119,7 @@ struct find_child_walk_data {
struct acpi_device *adev;
u64 address;
int score;
+ bool check_sta;
bool check_children;
};
@@ -131,9 +132,13 @@ static int check_one_child(struct acpi_device *adev, void *data)
return 0;
if (!wd->adev) {
- /* This is the first matching object. Save it and continue. */
+ /*
+ * This is the first matching object, so save it. If it is not
+ * necessary to look for any other matching objects, stop the
+ * search.
+ */
wd->adev = adev;
- return 0;
+ return !(wd->check_sta || wd->check_children);
}
/*
@@ -169,12 +174,14 @@ static int check_one_child(struct acpi_device *adev, void *data)
return 0;
}
-struct acpi_device *acpi_find_child_device(struct acpi_device *parent,
- u64 address, bool check_children)
+static struct acpi_device *acpi_find_child(struct acpi_device *parent,
+ u64 address, bool check_children,
+ bool check_sta)
{
struct find_child_walk_data wd = {
.address = address,
.check_children = check_children,
+ .check_sta = check_sta,
.adev = NULL,
.score = 0,
};
@@ -184,8 +191,21 @@ struct acpi_device *acpi_find_child_device(struct acpi_device *parent,
return wd.adev;
}
+
+struct acpi_device *acpi_find_child_device(struct acpi_device *parent,
+ u64 address, bool check_children)
+{
+ return acpi_find_child(parent, address, check_children, true);
+}
EXPORT_SYMBOL_GPL(acpi_find_child_device);
+struct acpi_device *acpi_find_child_by_adr(struct acpi_device *adev,
+ acpi_bus_address adr)
+{
+ return acpi_find_child(adev, adr, false, false);
+}
+EXPORT_SYMBOL_GPL(acpi_find_child_by_adr);
+
static void acpi_physnode_link_name(char *buf, unsigned int node_id)
{
if (node_id > 0)