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ACPI / utils: Introduce acpi_dev_get_first_match_dev() helper

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The acpi_dev_get_first_match_name() is missing put_device() call
and thus keeping reference counting unbalanced.

In order to fix the issue introduce a new helper to convert existing users
one-by-one to a better API.

Signed-off-by: Andy Shevchenko <andriy.shevchenko@linux.intel.com>
Reviewed-by: Hans de Goede <hdegoede@redhat.com>
Reviewed-by: Mika Westerberg <mika.westerberg@linux.intel.com>
Acked-by: Mark Brown <broonie@kernel.org>
Signed-off-by: Rafael J. Wysocki <rafael.j.wysocki@intel.com>
This commit is contained in:
Andy Shevchenko 2019-03-18 23:00:54 +03:00 committed by Rafael J. Wysocki
parent 79a3aaa7b8
commit 817b4d64da
3 changed files with 31 additions and 2 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

24
drivers/acpi/utils.c
View File

@ -739,6 +739,7 @@ EXPORT_SYMBOL(acpi_dev_found);
struct acpi_dev_match_info {
const char *dev_name;
struct acpi_device *adev;
struct acpi_device_id hid[2];
const char *uid;
s64 hrv;
@ -759,6 +760,7 @@ static int acpi_dev_match_cb(struct device *dev, void *data)
return 0;
match->dev_name = acpi_dev_name(adev);
match->adev = adev;
if (match->hrv == -1)
return 1;
@ -806,16 +808,34 @@ bool acpi_dev_present(const char *hid, const char *uid, s64 hrv)
EXPORT_SYMBOL(acpi_dev_present);
/**
* acpi_dev_get_first_match_name - Return name of first match of ACPI device
* acpi_dev_get_first_match_dev - Return the first match of ACPI device
* @hid: Hardware ID of the device.
* @uid: Unique ID of the device, pass NULL to not check _UID
* @hrv: Hardware Revision of the device, pass -1 to not check _HRV
*
* Return device name if a matching device was present
* Return the first match of ACPI device if a matching device was present
* at the moment of invocation, or NULL otherwise.
*
* The caller is responsible to call put_device() on the returned device.
*
* See additional information in acpi_dev_present() as well.
*/
struct acpi_device *
acpi_dev_get_first_match_dev(const char *hid, const char *uid, s64 hrv)
{
struct acpi_dev_match_info match = {};
struct device *dev;
strlcpy(match.hid[0].id, hid, sizeof(match.hid[0].id));
match.uid = uid;
match.hrv = hrv;
dev = bus_find_device(&acpi_bus_type, NULL, &match, acpi_dev_match_cb);
return dev ? match.adev : NULL;
}
EXPORT_SYMBOL(acpi_dev_get_first_match_dev);
/* DEPRECATED, use acpi_dev_get_first_match_dev() instead */
const char *
acpi_dev_get_first_match_name(const char *hid, const char *uid, s64 hrv)
{

3
include/acpi/acpi_bus.h
View File

@ -91,6 +91,9 @@ acpi_evaluate_dsm_typed(acpi_handle handle, const guid_t *guid, u64 rev,
bool acpi_dev_found(const char *hid);
bool acpi_dev_present(const char *hid, const char *uid, s64 hrv);
struct acpi_device *
acpi_dev_get_first_match_dev(const char *hid, const char *uid, s64 hrv);
const char *
acpi_dev_get_first_match_name(const char *hid, const char *uid, s64 hrv);

6
include/linux/acpi.h
View File

@ -669,6 +669,12 @@ static inline bool acpi_dev_present(const char *hid, const char *uid, s64 hrv)
return false;
}
static inline struct acpi_device *
acpi_dev_get_first_match_dev(const char *hid, const char *uid, s64 hrv)
{
return NULL;
}
static inline const char *
acpi_dev_get_first_match_name(const char *hid, const char *uid, s64 hrv)
{