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Wysocki" Subject: [PATCH v3 1/6] ACPI: scan: Extend acpi_walk_dep_device_list() Date: Mon, 22 Feb 2021 13:07:30 +0000 Message-Id: <20210222130735.1313443-2-djrscally@gmail.com> X-Mailer: git-send-email 2.25.1 In-Reply-To: <20210222130735.1313443-1-djrscally@gmail.com> References: <20210222130735.1313443-1-djrscally@gmail.com> MIME-Version: 1.0 Precedence: bulk List-ID: X-Mailing-List: linux-i2c@vger.kernel.org The acpi_walk_dep_device_list() is not as generalisable as its name implies, serving only to decrement the dependency count for each dependent device of the input. Extend the function to instead accept a callback which can be applied to all the dependencies in acpi_dep_list. Replace all existing calls to the function with calls to a wrapper, passing a callback that applies the same dependency reduction. Suggested-by: Rafael J. Wysocki Signed-off-by: Daniel Scally --- Changes in v3: - patch introduced drivers/acpi/ec.c | 2 +- drivers/acpi/pmic/intel_pmic_chtdc_ti.c | 2 +- drivers/acpi/scan.c | 58 ++++++++++++++++------- drivers/gpio/gpiolib-acpi.c | 2 +- drivers/i2c/i2c-core-acpi.c | 2 +- drivers/platform/surface/surface3_power.c | 2 +- include/acpi/acpi_bus.h | 7 +++ include/linux/acpi.h | 4 +- 8 files changed, 55 insertions(+), 24 deletions(-) diff --git a/drivers/acpi/ec.c b/drivers/acpi/ec.c index 13565629ce0a..a258db713bd2 100644 --- a/drivers/acpi/ec.c +++ b/drivers/acpi/ec.c @@ -1627,7 +1627,7 @@ static int acpi_ec_add(struct acpi_device *device) WARN(!ret, "Could not request EC cmd io port 0x%lx", ec->command_addr); /* Reprobe devices depending on the EC */ - acpi_walk_dep_device_list(ec->handle); + acpi_dev_flag_dependency_met(ec->handle); acpi_handle_debug(ec->handle, "enumerated.\n"); return 0; diff --git a/drivers/acpi/pmic/intel_pmic_chtdc_ti.c b/drivers/acpi/pmic/intel_pmic_chtdc_ti.c index a5101b07611a..59cca504325e 100644 --- a/drivers/acpi/pmic/intel_pmic_chtdc_ti.c +++ b/drivers/acpi/pmic/intel_pmic_chtdc_ti.c @@ -117,7 +117,7 @@ static int chtdc_ti_pmic_opregion_probe(struct platform_device *pdev) return err; /* Re-enumerate devices depending on PMIC */ - acpi_walk_dep_device_list(ACPI_HANDLE(pdev->dev.parent)); + acpi_dev_flag_dependency_met(ACPI_HANDLE(pdev->dev.parent)); return 0; } diff --git a/drivers/acpi/scan.c b/drivers/acpi/scan.c index 80b668c80073..c9e4190316ef 100644 --- a/drivers/acpi/scan.c +++ b/drivers/acpi/scan.c @@ -49,12 +49,6 @@ static DEFINE_MUTEX(acpi_hp_context_lock); */ static u64 spcr_uart_addr; -struct acpi_dep_data { - struct list_head node; - acpi_handle supplier; - acpi_handle consumer; -}; - void acpi_scan_lock_acquire(void) { mutex_lock(&acpi_scan_lock); @@ -2099,30 +2093,58 @@ static void acpi_bus_attach(struct acpi_device *device, bool first_pass) device->handler->hotplug.notify_online(device); } -void acpi_walk_dep_device_list(acpi_handle handle) +static int __acpi_dev_flag_dependency_met(struct acpi_dep_data *dep, + void *data) { - struct acpi_dep_data *dep, *tmp; struct acpi_device *adev; + acpi_bus_get_device(dep->consumer, &adev); + if (!adev) + return 0; + + adev->dep_unmet--; + if (!adev->dep_unmet) + acpi_bus_attach(adev, true); + + list_del(&dep->node); + kfree(dep); + return 0; +} + +void acpi_walk_dep_device_list(acpi_handle handle, + int (*callback)(struct acpi_dep_data *, void *), + void *data) +{ + struct acpi_dep_data *dep, *tmp; + int ret; + mutex_lock(&acpi_dep_list_lock); list_for_each_entry_safe(dep, tmp, &acpi_dep_list, node) { if (dep->supplier == handle) { - acpi_bus_get_device(dep->consumer, &adev); - if (!adev) - continue; - - adev->dep_unmet--; - if (!adev->dep_unmet) - acpi_bus_attach(adev, true); - - list_del(&dep->node); - kfree(dep); + ret = callback(dep, data); + if (ret) + break; } } mutex_unlock(&acpi_dep_list_lock); } EXPORT_SYMBOL_GPL(acpi_walk_dep_device_list); +/** + * acpi_dev_flag_dependency_met() - Inform consumers of @handle that the device + * is now active + * @handle: acpi_handle for the supplier device + * + * This function walks through the dependencies list and informs each consumer + * of @handle that their dependency upon it is now met. Devices with no more + * unmet dependencies will be attached to the acpi bus. + */ +void acpi_dev_flag_dependency_met(acpi_handle handle) +{ + acpi_walk_dep_device_list(handle, __acpi_dev_flag_dependency_met, NULL); +} +EXPORT_SYMBOL_GPL(acpi_dev_flag_dependency_met); + /** * acpi_bus_scan - Add ACPI device node objects in a given namespace scope. * @handle: Root of the namespace scope to scan. diff --git a/drivers/gpio/gpiolib-acpi.c b/drivers/gpio/gpiolib-acpi.c index e37a57d0a2f0..e4d728fda982 100644 --- a/drivers/gpio/gpiolib-acpi.c +++ b/drivers/gpio/gpiolib-acpi.c @@ -1254,7 +1254,7 @@ void acpi_gpiochip_add(struct gpio_chip *chip) acpi_gpiochip_request_regions(acpi_gpio); acpi_gpiochip_scan_gpios(acpi_gpio); - acpi_walk_dep_device_list(handle); + acpi_dev_flag_dependency_met(handle); } void acpi_gpiochip_remove(struct gpio_chip *chip) diff --git a/drivers/i2c/i2c-core-acpi.c b/drivers/i2c/i2c-core-acpi.c index 37c510d9347a..38647cf34bde 100644 --- a/drivers/i2c/i2c-core-acpi.c +++ b/drivers/i2c/i2c-core-acpi.c @@ -283,7 +283,7 @@ void i2c_acpi_register_devices(struct i2c_adapter *adap) if (!handle) return; - acpi_walk_dep_device_list(handle); + acpi_dev_flag_dependency_met(handle); } static const struct acpi_device_id i2c_acpi_force_400khz_device_ids[] = { diff --git a/drivers/platform/surface/surface3_power.c b/drivers/platform/surface/surface3_power.c index cc4f9cba6856..ad895285d3e9 100644 --- a/drivers/platform/surface/surface3_power.c +++ b/drivers/platform/surface/surface3_power.c @@ -478,7 +478,7 @@ static int mshw0011_install_space_handler(struct i2c_client *client) return -ENOMEM; } - acpi_walk_dep_device_list(handle); + acpi_dev_flag_dependency_met(handle); return 0; } diff --git a/include/acpi/acpi_bus.h b/include/acpi/acpi_bus.h index 02a716a0af5d..91172af3a04d 100644 --- a/include/acpi/acpi_bus.h +++ b/include/acpi/acpi_bus.h @@ -278,6 +278,12 @@ struct acpi_device_power { struct acpi_device_power_state states[ACPI_D_STATE_COUNT]; /* Power states (D0-D3Cold) */ }; +struct acpi_dep_data { + struct list_head node; + acpi_handle supplier; + acpi_handle consumer; +}; + /* Performance Management */ struct acpi_device_perf_flags { @@ -683,6 +689,7 @@ static inline bool acpi_device_can_poweroff(struct acpi_device *adev) bool acpi_dev_hid_uid_match(struct acpi_device *adev, const char *hid2, const char *uid2); +void acpi_dev_flag_dependency_met(acpi_handle handle); struct acpi_device * acpi_dev_get_next_match_dev(struct acpi_device *adev, const char *hid, const char *uid, s64 hrv); struct acpi_device * diff --git a/include/linux/acpi.h b/include/linux/acpi.h index 2630c2e953f7..2d5e6e88e8a0 100644 --- a/include/linux/acpi.h +++ b/include/linux/acpi.h @@ -655,7 +655,9 @@ extern bool acpi_driver_match_device(struct device *dev, const struct device_driver *drv); int acpi_device_uevent_modalias(struct device *, struct kobj_uevent_env *); int acpi_device_modalias(struct device *, char *, int); -void acpi_walk_dep_device_list(acpi_handle handle); +void acpi_walk_dep_device_list(acpi_handle handle, + int (*callback)(struct acpi_dep_data *, void *), + void *data); struct platform_device *acpi_create_platform_device(struct acpi_device *, struct property_entry *);