UbiquitousOS
/
OpenCloudOS-Kernel
mirror of https://gitee.com/OpenCloudOS/OpenCloudOS-Kernel.git
11
0
Fork 0
Code Issues Projects Releases Wiki Activity

ACPI: Make seemingly useless check in osl.c more understandable 

There is a seemingly useless check in drivers/acpi/osl.c added by
commit bc73675 (ACPI: fixes a false alarm from lockdep), which really
is necessary to avoid false positive lockdep complaints.  Document
this and rearrange the code related to it so that it makes fewer
checks.

Signed-off-by: Rafael J. Wysocki <rafael.j.wysocki@intel.com>
Acked-by: Yinghai Lu <yinghai@kernel.org>
This commit is contained in:
Rafael J. Wysocki 2012-11-02 13:09:08 +01:00
parent c5b18e22e7
commit 3ae45a27df
1 changed files with 13 additions and 8 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

21
drivers/acpi/osl.c
View File

@ -932,7 +932,7 @@ static acpi_status __acpi_os_execute(acpi_execute_type type,
* having a static work_struct. * having a static work_struct.
*/ */
dpc = kmalloc(sizeof(struct acpi_os_dpc), GFP_ATOMIC); dpc = kzalloc(sizeof(struct acpi_os_dpc), GFP_ATOMIC);
if (!dpc) if (!dpc)
return AE_NO_MEMORY; return AE_NO_MEMORY;
@ -944,17 +944,22 @@ static acpi_status __acpi_os_execute(acpi_execute_type type,
* because the hotplug code may call driver .remove() functions, * because the hotplug code may call driver .remove() functions,
* which invoke flush_scheduled_work/acpi_os_wait_events_complete * which invoke flush_scheduled_work/acpi_os_wait_events_complete
* to flush these workqueues. * to flush these workqueues.
*
* To prevent lockdep from complaining unnecessarily, make sure that
* there is a different static lockdep key for each workqueue by using
* INIT_WORK() for each of them separately.
*/ */
queue = hp ? kacpi_hotplug_wq : if (hp) {
(type == OSL_NOTIFY_HANDLER ? kacpi_notify_wq : kacpid_wq); queue = kacpi_hotplug_wq;
dpc->wait = hp ? 1 : 0; dpc->wait = 1;
if (queue == kacpi_hotplug_wq)
INIT_WORK(&dpc->work, acpi_os_execute_deferred); INIT_WORK(&dpc->work, acpi_os_execute_deferred);
else if (queue == kacpi_notify_wq) } else if (type == OSL_NOTIFY_HANDLER) {
queue = kacpi_notify_wq;
INIT_WORK(&dpc->work, acpi_os_execute_deferred); INIT_WORK(&dpc->work, acpi_os_execute_deferred);
else } else {
queue = kacpid_wq;
INIT_WORK(&dpc->work, acpi_os_execute_deferred); INIT_WORK(&dpc->work, acpi_os_execute_deferred);
}
/* /*
* On some machines, a software-initiated SMI causes corruption unless * On some machines, a software-initiated SMI causes corruption unless