ACPI: ACPICA 20060623

Implemented a new acpi_spinlock type for the OSL lock
interfaces.  This allows the type to be customized to
the host OS for improved efficiency (since a spinlock is
usually a very small object.)

Implemented support for "ignored" bits in the ACPI
registers.  According to the ACPI specification, these
bits should be preserved when writing the registers via
a read/modify/write cycle. There are 3 bits preserved
in this manner: PM1_CONTROL[0] (SCI_EN), PM1_CONTROL[9],
and PM1_STATUS[11].
http://bugzilla.kernel.org/show_bug.cgi?id=3691

Implemented the initial deployment of new OSL mutex
interfaces.  Since some host operating systems have
separate mutex and semaphore objects, this feature was
requested. The base code now uses mutexes (and the new
mutex interfaces) wherever a binary semaphore was used
previously. However, for the current release, the mutex
interfaces are defined as macros to map them to the
existing semaphore interfaces.

Fixed several problems with the support for the control
method SyncLevel parameter. The SyncLevel now works
according to the ACPI specification and in concert with the
Mutex SyncLevel parameter, since the current SyncLevel is
a property of the executing thread. Mutual exclusion for
control methods is now implemented with a mutex instead
of a semaphore.

Fixed three instances of the use of the C shift operator
in the bitfield support code (exfldio.c) to avoid the use
of a shift value larger than the target data width. The
behavior of C compilers is undefined in this case and can
cause unpredictable results, and therefore the case must
be detected and avoided.  (Fiodor Suietov)

Added an info message whenever an SSDT or OEM table
is loaded dynamically via the Load() or LoadTable()
ASL operators. This should improve debugging capability
since it will show exactly what tables have been loaded
(beyond the tables present in the RSDT/XSDT.)

Signed-off-by: Bob Moore <robert.moore@intel.com>
Signed-off-by: Len Brown <len.brown@intel.com>

1 files changed, 5 insertions, 9 deletions

diff --git a/drivers/acpi/events/evgpe.c b/drivers/acpi/events/evgpe.c
index f01d339407f8..c76c0583ca6a 100644
--- a/drivers/acpi/events/evgpe.c
+++ b/drivers/acpi/events/evgpe.c
@@ -382,7 +382,6 @@ u32 acpi_ev_gpe_detect(struct acpi_gpe_xrupt_info * gpe_xrupt_list)
         u32 status_reg;
         u32 enable_reg;
         acpi_cpu_flags flags;
-        acpi_cpu_flags hw_flags;
         acpi_native_uint i;
         acpi_native_uint j;
 
@@ -394,8 +393,11 @@ u32 acpi_ev_gpe_detect(struct acpi_gpe_xrupt_info * gpe_xrupt_list)
                 return (int_status);
         }
 
-        /* We need to hold the GPE lock now, hardware lock in the loop */
-
+        /*
+         * We need to obtain the GPE lock for both the data structs and registers
+         * Note: Not necessary to obtain the hardware lock, since the GPE registers
+         * are owned by the gpe_lock.
+         */
         flags = acpi_os_acquire_lock(acpi_gbl_gpe_lock);
 
         /* Examine all GPE blocks attached to this interrupt level */
@@ -413,8 +415,6 @@ u32 acpi_ev_gpe_detect(struct acpi_gpe_xrupt_info * gpe_xrupt_list)
 
                         gpe_register_info = &gpe_block->register_info[i];
 
-                        hw_flags = acpi_os_acquire_lock(acpi_gbl_hardware_lock);
-
                         /* Read the Status Register */
 
                         status =
@@ -423,8 +423,6 @@ u32 acpi_ev_gpe_detect(struct acpi_gpe_xrupt_info * gpe_xrupt_list)
                                                    &gpe_register_info->
                                                    status_address);
                         if (ACPI_FAILURE(status)) {
-                                acpi_os_release_lock(acpi_gbl_hardware_lock,
-                                                     hw_flags);
                                 goto unlock_and_exit;
                         }
 
@@ -435,8 +433,6 @@ u32 acpi_ev_gpe_detect(struct acpi_gpe_xrupt_info * gpe_xrupt_list)
                                                    &enable_reg,
                                                    &gpe_register_info->
                                                    enable_address);
-                        acpi_os_release_lock(acpi_gbl_hardware_lock, hw_flags);
-
                         if (ACPI_FAILURE(status)) {
                                 goto unlock_and_exit;
                         }