[PATCH][2.4] fix "pci=noacpi" boot option

[Thomas Schlichter <schlicht@uni-mannheim.de>]

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Hi Len,

some time ago I sent a patch which fixed problems with the "pci=noacpi" boot 
option of the 2.5.xx linux-kernel. It got applied to the 2.5 kernel tree but 
I missed to create a similar fix for the 2.4 tree which seems to have the 
same issue.

Now I've seen reports of people having problems with the "pci=noacpi" boot 
option with current 2.4.xx kernel versions, too. So I ported my old patch to 
2.4.22-bk34, tested it and attached it to this mail. You may consider pushing 
it to Marcelo.

Kind regards,
  Thomas

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--- linux-2.4.22-bk34/arch/i386/kernel/acpi.c.orig	Tue Oct 14 20:50:18 2003
+++ linux-2.4.22-bk34/arch/i386/kernel/acpi.c	Tue Oct 14 20:53:45 2003
@@ -58,6 +58,7 @@
 
 #ifdef CONFIG_ACPI_BOOT
 extern int acpi_disabled;
+extern int acpi_irq;
 extern int acpi_ht;
 
 enum acpi_irq_model_id		acpi_irq_model;
@@ -415,7 +416,7 @@
 	 * If MPS is present, it will handle them,
 	 * otherwise the system will stay in PIC mode
 	 */
-	if (acpi_disabled) {
+	if (acpi_disabled || !acpi_irq) {
 		return 1;
 	}
 
--- linux-2.4.22-bk34/arch/i386/kernel/setup.c.orig	Tue Oct 14 20:50:25 2003
+++ linux-2.4.22-bk34/arch/i386/kernel/setup.c	Tue Oct 14 20:57:34 2003
@@ -184,6 +184,7 @@
 EXPORT_SYMBOL(acpi_disabled);
 
 #ifdef	CONFIG_ACPI_BOOT
+	int acpi_irq __initdata = 1; 	/* enable IRQ */
 	int acpi_ht __initdata = 1; 	/* enable HT */
 #endif
 
@@ -848,6 +849,11 @@
 		else if (!memcmp(from, "acpi=ht", 7)) { 
 			acpi_ht = 1; 
 			if (!acpi_force) acpi_disabled = 1; 
+		} 
+
+		/* "pci=noacpi" disables ACPI interrupt routing */
+		else if (!memcmp(from, "pci=noacpi", 10)) { 
+			acpi_irq = 0; 
 		} 
 
                 /* disable IO-APIC */

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