Merge branch 'release' of git://git.kernel.org/pub/scm/linux/kernel/git/lenb/linux-acpi-2.6

* 'release' of git://git.kernel.org/pub/scm/linux/kernel/git/lenb/linux-acpi-2.6: (179 commits)
  ACPI: Fix acpi_processor_idle and idle= boot parameters interaction
  acpi: fix section mismatch warning in pnpacpi
  intel_menlo: fix build warning
  ACPI: Cleanup: Remove unneeded, multiple local dummy variables
  ACPI: video - fix permissions on some proc entries
  ACPI: video - properly handle errors when registering proc elements
  ACPI: video - do not store invalid entries in attached_array list
  ACPI: re-name acpi_pm_ops to acpi_suspend_ops
  ACER_WMI/ASUS_LAPTOP: fix build bug
  thinkpad_acpi: fix possible NULL pointer dereference if kstrdup failed
  ACPI: check a return value correctly in acpi_power_get_context()
  #if 0 acpi/bay.c:eject_removable_drive()
  eeepc-laptop: add hwmon fan control
  eeepc-laptop: add backlight
  eeepc-laptop: add base driver
  ACPI: thinkpad-acpi: bump up version to 0.20
  ACPI: thinkpad-acpi: fix selects in Kconfig
  ACPI: thinkpad-acpi: use a private workqueue
  ACPI: thinkpad-acpi: fluff really minor fix
  ACPI: thinkpad-acpi: use uppercase for "LED" on user documentation
  ...

Fixed conflicts in drivers/acpi/video.c and drivers/misc/intel_menlow.c
manually.

1 files changed, 17 insertions, 6 deletions

diff --git a/drivers/acpi/events/evxface.c b/drivers/acpi/events/evxface.c
index 6d866a01f5f4..94a6efe020be 100644
--- a/drivers/acpi/events/evxface.c
+++ b/drivers/acpi/events/evxface.c
@@ -5,7 +5,7 @@
  *****************************************************************************/
 
 /*
- * Copyright (C) 2000 - 2007, R. Byron Moore
+ * Copyright (C) 2000 - 2008, Intel Corp.
  * All rights reserved.
  *
  * Redistribution and use in source and binary forms, with or without
@@ -758,6 +758,12 @@ ACPI_EXPORT_SYMBOL(acpi_remove_gpe_handler)
  *
  * DESCRIPTION: Acquire the ACPI Global Lock
  *
+ * Note: Allows callers with the same thread ID to acquire the global lock
+ * multiple times. In other words, externally, the behavior of the global lock
+ * is identical to an AML mutex. On the first acquire, a new handle is
+ * returned. On any subsequent calls to acquire by the same thread, the same
+ * handle is returned.
+ *
  ******************************************************************************/
 acpi_status acpi_acquire_global_lock(u16 timeout, u32 * handle)
 {
@@ -770,14 +776,19 @@ acpi_status acpi_acquire_global_lock(u16 timeout, u32 * handle)
 	/* Must lock interpreter to prevent race conditions */
 
 	acpi_ex_enter_interpreter();
-	status = acpi_ev_acquire_global_lock(timeout);
-	acpi_ex_exit_interpreter();
+
+	status = acpi_ex_acquire_mutex_object(timeout,
+					      acpi_gbl_global_lock_mutex,
+					      acpi_os_get_thread_id());
 
 	if (ACPI_SUCCESS(status)) {
-		acpi_gbl_global_lock_handle++;
+
+		/* Return the global lock handle (updated in acpi_ev_acquire_global_lock) */
+
 		*handle = acpi_gbl_global_lock_handle;
 	}
 
+	acpi_ex_exit_interpreter();
 	return (status);
 }
 
@@ -798,11 +809,11 @@ acpi_status acpi_release_global_lock(u32 handle)
 {
 	acpi_status status;
 
-	if (handle != acpi_gbl_global_lock_handle) {
+	if (!handle || (handle != acpi_gbl_global_lock_handle)) {
 		return (AE_NOT_ACQUIRED);
 	}
 
-	status = acpi_ev_release_global_lock();
+	status = acpi_ex_release_mutex_object(acpi_gbl_global_lock_mutex);
 	return (status);
 }