From dc67d3948a01038ceb2836368391c984b516ba10 Mon Sep 17 00:00:00 2001
From: kettenis <kettenis@openbsd.org>
Date: Sat, 26 Apr 2014 21:45:50 +0000
Subject: [PATCH] Get rid of duplication of the global lock code.  Allow
 recursion in all code paths.

ok pirofti@
---
 sys/dev/acpi/dsdt.c | 70 ++++++++++++++++++---------------------------
 1 file changed, 28 insertions(+), 42 deletions(-)

diff --git a/sys/dev/acpi/dsdt.c b/sys/dev/acpi/dsdt.c
index 10c2f74ab6f..6c29cd1078d 100644
--- a/sys/dev/acpi/dsdt.c
+++ b/sys/dev/acpi/dsdt.c
@@ -1,4 +1,4 @@
-/* $OpenBSD: dsdt.c,v 1.206 2014/03/13 18:52:38 brynet Exp $ */
+/* $OpenBSD: dsdt.c,v 1.207 2014/04/26 21:45:50 kettenis Exp $ */
 /*
  * Copyright (c) 2005 Jordan Hargrave <jordan@openbsd.org>
  *
@@ -735,73 +735,59 @@ static long global_lock_count = 0;
 
 void
 acpi_glk_enter(void)
-{
-	acpi_acquire_glk(&acpi_softc->sc_facs->global_lock);
-}
-
-void
-acpi_glk_leave(void)
-{
-	int x;
-
-	if (acpi_release_glk(&acpi_softc->sc_facs->global_lock)) {
-		/*
-		 * If pending, notify the BIOS that the lock was released
-		 * by the OSPM. No locking is needed because nobody outside
-		 * the ACPI thread is touching this register.
-		 */
-		x = acpi_read_pmreg(acpi_softc, ACPIREG_PM1_CNT, 0);
-		x |= ACPI_PM1_GBL_RLS;
-		acpi_write_pmreg(acpi_softc, ACPIREG_PM1_CNT, 0, x);
-	}
-}
-
-void
-aml_lockfield(struct aml_scope *scope, struct aml_value *field)
 {
 	int st = 0;
 
-	if (AML_FIELD_LOCK(field->v_field.flags) != AML_FIELD_LOCK_ON)
-		return;
-
-	/* If lock is already ours, just continue */
+	/* If lock is already ours, just continue. */
 	if (global_lock_count++)
 		return;
 
-	/* Spin to acquire lock */
+	/* Spin to acquire the lock. */
 	while (!st) {
 		st = acpi_acquire_glk(&acpi_softc->sc_facs->global_lock);
 		/* XXX - yield/delay? */
 	}
-
-	return;
 }
 
 void
-aml_unlockfield(struct aml_scope *scope, struct aml_value *field)
+acpi_glk_leave(void)
 {
-	int st, x, s;
+	int st, x;
 
-	if (AML_FIELD_LOCK(field->v_field.flags) != AML_FIELD_LOCK_ON)
-		return;
-
-	/* If we are the last ones, turn out the lights */
+	/* If we are the last one, turn out the lights. */
 	if (--global_lock_count)
 		return;
 
-	/* Release lock */
 	st = acpi_release_glk(&acpi_softc->sc_facs->global_lock);
 	if (!st)
 		return;
 
-	/* Signal others if someone waiting */
-	s = spltty();
+	/*
+	 * If pending, notify the BIOS that the lock was released by
+	 * OSPM.  No locking is needed because nobody outside the ACPI
+	 * thread is supposed to touch this register.
+	 */
 	x = acpi_read_pmreg(acpi_softc, ACPIREG_PM1_CNT, 0);
 	x |= ACPI_PM1_GBL_RLS;
 	acpi_write_pmreg(acpi_softc, ACPIREG_PM1_CNT, 0, x);
-	splx(s);
+}
+
+void
+aml_lockfield(struct aml_scope *scope, struct aml_value *field)
+{
+	if (AML_FIELD_LOCK(field->v_field.flags) != AML_FIELD_LOCK_ON)
+		return;
+
+	acpi_glk_enter();
+}
+
+void
+aml_unlockfield(struct aml_scope *scope, struct aml_value *field)
+{
+	if (AML_FIELD_LOCK(field->v_field.flags) != AML_FIELD_LOCK_ON)
+		return;
 
-	return;
+	acpi_glk_leave();
 }
 
 /*
-- 
2.20.1