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ACPICA: Release global lock from interrupt handler 

The ACPI Global Lock interrupt handler no longer
queues the execution of a separate thread to signal the
global lock semaphore. Instead, the semaphore is signaled
directly from the interrupt handler.

Signed-off-by: Alexey Starikovskiy <alexey.y.starikovskiy@intel.com>
Signed-off-by: Len Brown <len.brown@intel.com>
This commit is contained in:
Bob Moore 2007-02-02 19:48:18 +03:00 committed by Len Brown
parent c81da66608
commit a72d47563b
1 changed files with 15 additions and 35 deletions
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50
drivers/acpi/events/evmisc.c
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@ -67,8 +67,6 @@ static const char *acpi_notify_value_names[] = {
static void ACPI_SYSTEM_XFACE acpi_ev_notify_dispatch(void *context);
static void ACPI_SYSTEM_XFACE acpi_ev_global_lock_thread(void *context);
static u32 acpi_ev_global_lock_handler(void *context);
/*******************************************************************************
@ -280,45 +278,21 @@ static void ACPI_SYSTEM_XFACE acpi_ev_notify_dispatch(void *context)
acpi_ut_delete_generic_state(notify_info);
}
/*******************************************************************************
*
* FUNCTION: acpi_ev_global_lock_thread
*
* PARAMETERS: Context - From thread interface, not used
*
* RETURN: None
*
* DESCRIPTION: Invoked by SCI interrupt handler upon acquisition of the
* Global Lock. Simply signal all threads that are waiting
* for the lock.
*
******************************************************************************/
static void ACPI_SYSTEM_XFACE acpi_ev_global_lock_thread(void *context)
{
acpi_status status;
/* Signal the thread that is waiting for the lock */
/* Send a unit to the semaphore */
status = acpi_os_signal_semaphore(acpi_gbl_global_lock_semaphore, 1);
if (ACPI_FAILURE(status)) {
ACPI_ERROR((AE_INFO, "Could not signal Global Lock semaphore"));
}
}
/*******************************************************************************
*
* FUNCTION: acpi_ev_global_lock_handler
*
* PARAMETERS: Context - From thread interface, not used
*
* RETURN: ACPI_INTERRUPT_HANDLED or ACPI_INTERRUPT_NOT_HANDLED
* RETURN: ACPI_INTERRUPT_HANDLED
*
* DESCRIPTION: Invoked directly from the SCI handler when a global lock
* release interrupt occurs. Grab the global lock and queue
* the global lock thread for execution
* release interrupt occurs. Attempt to acquire the global lock,
* if successful, signal the thread waiting for the lock.
*
* NOTE: Assumes that the semaphore can be signaled from interrupt level. If
* this is not possible for some reason, a separate thread will have to be
* scheduled to do this.
*
******************************************************************************/
@ -338,7 +312,13 @@ static u32 acpi_ev_global_lock_handler(void *context)
/* Got the lock, now wake all threads waiting for it */
acpi_gbl_global_lock_acquired = TRUE;
acpi_ev_global_lock_thread(context);
/* Send a unit to the semaphore */
if (ACPI_FAILURE(acpi_os_signal_semaphore(
acpi_gbl_global_lock_semaphore, 1))) {
ACPI_ERROR((AE_INFO,
"Could not signal Global Lock semaphore"));
}
}
return (ACPI_INTERRUPT_HANDLED);
@ -480,7 +460,7 @@ acpi_status acpi_ev_release_global_lock(void)
ACPI_FUNCTION_TRACE(ev_release_global_lock);
/* Lock must be acquired */
/* Lock must be already acquired */
if (!acpi_gbl_global_lock_acquired) {
ACPI_WARNING((AE_INFO,