From 8d287e8292ea126d55beb29f2b3f07dfad5b6bc0 Mon Sep 17 00:00:00 2001 From: "Rafael J. Wysocki" Date: Wed, 16 Jun 2021 16:05:50 +0200 Subject: [PATCH] ACPI: scan: Simplify acpi_table_events_fn() Notice that the table field of struct acpi_table_events_work is never read and its event field is always equal to ACPI_TABLE_EVENT_LOAD, so both of them are redundant. Accordingly, drop struct acpi_table_events_work and use struct work_struct directly instead of it, simplify acpi_scan_table_handler() and rename it to acpi_scan_table_notify(). Moreover, make acpi_bus_table_handler() check the event code against ACPI_TABLE_EVENT_LOAD before calling acpi_scan_table_notify(), so it is not necessary to do that check in the latter. No intentional functional impact. Signed-off-by: Rafael J. Wysocki --- drivers/acpi/bus.c | 3 ++- drivers/acpi/internal.h | 2 +- drivers/acpi/scan.c | 38 ++++++++++---------------------------- 3 files changed, 13 insertions(+), 30 deletions(-) diff --git a/drivers/acpi/bus.c b/drivers/acpi/bus.c index be7da23fad76..a3a56c00bd08 100644 --- a/drivers/acpi/bus.c +++ b/drivers/acpi/bus.c @@ -1206,7 +1206,8 @@ void __init acpi_subsystem_init(void) static acpi_status acpi_bus_table_handler(u32 event, void *table, void *context) { - acpi_scan_table_handler(event, table, context); + if (event == ACPI_TABLE_EVENT_LOAD) + acpi_scan_table_notify(); return acpi_sysfs_table_handler(event, table, context); } diff --git a/drivers/acpi/internal.h b/drivers/acpi/internal.h index f973bbe90e5e..47947d612b43 100644 --- a/drivers/acpi/internal.h +++ b/drivers/acpi/internal.h @@ -88,7 +88,7 @@ void acpi_device_hotplug(struct acpi_device *adev, u32 src); bool acpi_scan_is_offline(struct acpi_device *adev, bool uevent); acpi_status acpi_sysfs_table_handler(u32 event, void *table, void *context); -void acpi_scan_table_handler(u32 event, void *table, void *context); +void acpi_scan_table_notify(void); /* -------------------------------------------------------------------------- Device Node Initialization / Removal diff --git a/drivers/acpi/scan.c b/drivers/acpi/scan.c index 1c6205661000..f8eaddb83484 100644 --- a/drivers/acpi/scan.c +++ b/drivers/acpi/scan.c @@ -2533,46 +2533,28 @@ int __init __acpi_probe_device_table(struct acpi_probe_entry *ap_head, int nr) return count; } -struct acpi_table_events_work { - struct work_struct work; - void *table; - u32 event; -}; - static void acpi_table_events_fn(struct work_struct *work) { - struct acpi_table_events_work *tew; + acpi_scan_lock_acquire(); + acpi_bus_scan(ACPI_ROOT_OBJECT); + acpi_scan_lock_release(); - tew = container_of(work, struct acpi_table_events_work, work); - - if (tew->event == ACPI_TABLE_EVENT_LOAD) { - acpi_scan_lock_acquire(); - acpi_bus_scan(ACPI_ROOT_OBJECT); - acpi_scan_lock_release(); - } - - kfree(tew); + kfree(work); } -void acpi_scan_table_handler(u32 event, void *table, void *context) +void acpi_scan_table_notify(void) { - struct acpi_table_events_work *tew; + struct work_struct *work; if (!acpi_scan_initialized) return; - if (event != ACPI_TABLE_EVENT_LOAD) + work = kmalloc(sizeof(*work), GFP_KERNEL); + if (!work) return; - tew = kmalloc(sizeof(*tew), GFP_KERNEL); - if (!tew) - return; - - INIT_WORK(&tew->work, acpi_table_events_fn); - tew->table = table; - tew->event = event; - - schedule_work(&tew->work); + INIT_WORK(work, acpi_table_events_fn); + schedule_work(work); } int acpi_reconfig_notifier_register(struct notifier_block *nb)