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Pull bugzilla-8066 into release branch

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This commit is contained in:
Len Brown 2007-03-09 23:19:19 -05:00
commit bdf3aaf951
1 changed files with 23 additions and 2 deletions
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25
drivers/acpi/events/evmisc.c
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@ -423,6 +423,8 @@ static acpi_status acpi_ev_remove_global_lock_handler(void)
* the global lock appear as a standard mutex on the OS side.
*
*****************************************************************************/
static acpi_thread_id acpi_ev_global_lock_thread_id;
static int acpi_ev_global_lock_acquired;
acpi_status acpi_ev_acquire_global_lock(u16 timeout)
{
@ -435,11 +437,24 @@ acpi_status acpi_ev_acquire_global_lock(u16 timeout)
* Only one thread can acquire the GL at a time, the global_lock_mutex
* enforces this. This interface releases the interpreter if we must wait.
*/
status = acpi_ex_system_wait_mutex(acpi_gbl_global_lock_mutex, timeout);
status = acpi_ex_system_wait_mutex(acpi_gbl_global_lock_mutex, 0);
if (status == AE_TIME) {
if (acpi_ev_global_lock_thread_id == acpi_os_get_thread_id()) {
acpi_ev_global_lock_acquired++;
return AE_OK;
}
}
if (ACPI_FAILURE(status)) {
status = acpi_ex_system_wait_mutex(acpi_gbl_global_lock_mutex, timeout);
}
if (ACPI_FAILURE(status)) {
return_ACPI_STATUS(status);
}
acpi_ev_global_lock_thread_id = acpi_os_get_thread_id();
acpi_ev_global_lock_acquired++;
/*
* Make sure that a global lock actually exists. If not, just treat
* the lock as a standard mutex.
@ -506,6 +521,11 @@ acpi_status acpi_ev_release_global_lock(void)
return_ACPI_STATUS(AE_NOT_ACQUIRED);
}
acpi_ev_global_lock_acquired--;
if (acpi_ev_global_lock_acquired > 0) {
return AE_OK;
}
if (acpi_gbl_global_lock_present) {
/* Allow any thread to release the lock */
@ -529,7 +549,8 @@ acpi_status acpi_ev_release_global_lock(void)
acpi_gbl_global_lock_acquired = FALSE;
/* Release the local GL mutex */
acpi_ev_global_lock_thread_id = 0;
acpi_ev_global_lock_acquired = 0;
acpi_os_release_mutex(acpi_gbl_global_lock_mutex);
return_ACPI_STATUS(status);
}