diff options
| author | Bob Moore <robert.moore@intel.com> | 2007-02-02 19:48:18 +0300 |
|---|---|---|
| committer | Len Brown <len.brown@intel.com> | 2007-02-02 21:14:20 -0500 |
| commit | a72d47563bce9542b9a83521a4e8175076278ee9 (patch) | |
| tree | a510267ef9cb9e2fe008e6fd2b0a5c57b03265a8 /drivers/acpi | |
| parent | c81da66608d65dab04730582dfdfcdcab779e2fe (diff) | |
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>
Diffstat (limited to 'drivers/acpi')
| -rw-r--r-- | drivers/acpi/events/evmisc.c | 50 |
1 files changed, 15 insertions, 35 deletions
diff --git a/drivers/acpi/events/evmisc.c b/drivers/acpi/events/evmisc.c index f82b81cc1838..00f33ed4c12e 100644 --- a/drivers/acpi/events/evmisc.c +++ b/drivers/acpi/events/evmisc.c @@ -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); /******************************************************************************* @@ -282,43 +280,19 @@ static void ACPI_SYSTEM_XFACE acpi_ev_notify_dispatch(void *context) /******************************************************************************* * - * 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, |