From mboxrd@z Thu Jan 1 00:00:00 1970 From: Andy Shevchenko Subject: [PATCH v3 01/10] ACPI / utils: Introduce acpi_dev_get_first_match_dev() helper Date: Thu, 28 Mar 2019 19:17:20 +0200 Message-ID: <20190328171729.44002-2-andriy.shevchenko@linux.intel.com> References: <20190328171729.44002-1-andriy.shevchenko@linux.intel.com> Mime-Version: 1.0 Content-Type: text/plain; charset="us-ascii" Content-Transfer-Encoding: 7bit Return-path: Received: from mga01.intel.com (mga01.intel.com [192.55.52.88]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by alsa1.perex.cz (Postfix) with ESMTPS id C07B6F896FF for ; Thu, 28 Mar 2019 18:17:39 +0100 (CET) In-Reply-To: <20190328171729.44002-1-andriy.shevchenko@linux.intel.com> List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Errors-To: alsa-devel-bounces@alsa-project.org Sender: "Alsa-devel" To: "Rafael J. Wysocki" , linux-acpi@vger.kernel.org, Pierre-Louis Bossart , Liam Girdwood , Jie Yang , Mark Brown , alsa-devel@alsa-project.org, Hans de Goede , Mika Westerberg Cc: Andy Shevchenko List-Id: alsa-devel@alsa-project.org 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. And then remove the old one. Signed-off-by: Andy Shevchenko Reviewed-by: Hans de Goede --- drivers/acpi/utils.c | 24 ++++++++++++++++++++++-- include/acpi/acpi_bus.h | 3 +++ include/linux/acpi.h | 6 ++++++ 3 files changed, 31 insertions(+), 2 deletions(-) diff --git a/drivers/acpi/utils.c b/drivers/acpi/utils.c index c4b06cc075f9..5a2bae2b6c3a 100644 --- a/drivers/acpi/utils.c +++ b/drivers/acpi/utils.c @@ -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) { diff --git a/include/acpi/acpi_bus.h b/include/acpi/acpi_bus.h index 0300374101cd..2063e9e2f384 100644 --- a/include/acpi/acpi_bus.h +++ b/include/acpi/acpi_bus.h @@ -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); diff --git a/include/linux/acpi.h b/include/linux/acpi.h index d5dcebd7aad3..3e1d16b00513 100644 --- a/include/linux/acpi.h +++ b/include/linux/acpi.h @@ -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) { -- 2.20.1