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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>
This commit is contained in:
Rafael J. Wysocki 2022-06-13 20:10:03 +02:00
parent f5122be80d
commit 2f6fe93fed
2 changed files with 26 additions and 4 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

28
drivers/acpi/glue.c
View File

@ -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)

2
include/acpi/acpi_bus.h
View File

@ -622,6 +622,8 @@ static inline int acpi_dma_configure(struct device *dev,
}
struct acpi_device *acpi_find_child_device(struct acpi_device *parent,
u64 address, bool check_children);
struct acpi_device *acpi_find_child_by_adr(struct acpi_device *adev,
acpi_bus_address adr);
int acpi_is_root_bridge(acpi_handle);
struct acpi_pci_root *acpi_pci_find_root(acpi_handle handle);