[PATCH] deal with lack of acpi prt entries gracefully

[Jesse Barnes]

Instead of going into an infinite loop because the list isn't setup yet,
just return NULL if there are no prt entries.

Jesse


diff -Nru a/drivers/acpi/pci_irq.c b/drivers/acpi/pci_irq.c
--- a/drivers/acpi/pci_irq.c	Tue Sep  9 10:24:14 2003
+++ b/drivers/acpi/pci_irq.c	Tue Sep  9 10:24:14 2003
@@ -71,6 +71,9 @@
 
 	ACPI_FUNCTION_TRACE("acpi_pci_irq_find_prt_entry");
 
+	if (!acpi_prt.count)
+		return_PTR(NULL);
+
 	/*
 	 * Parse through all PRT entries looking for a match on the specified
 	 * PCI device's segment, bus, device, and pin (don't care about func).
-
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