diff options
| author | Rafael J. Wysocki <rafael.j.wysocki@intel.com> | 2022-06-13 21:10:03 +0300 |
|---|---|---|
| committer | Rafael J. Wysocki <rafael.j.wysocki@intel.com> | 2022-06-20 21:28:48 +0300 |
| commit | 2f6fe93fede802acfe010752db461ccd34745745 (patch) | |
| tree | 1f4dd186389ec16e1d184ffa06b7efd8393ee79a /drivers/acpi | |
| parent | f5122be80daad8e53e6876add5ccbf9db7ca809c (diff) | |
| download | linux-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.c | 28 |
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) |