Another ACPI interrupt patch for testing

[Joerg Sonnenberger <joerg%britannica.bec.de@localhost>]

Hi all,
the attached patch is to address the issue from pR 37001:
LNKE: ACPI: Found matching pin for 1.8.INTA at func 0: 11
LNKB: ACPI: Found matching pin for 1.8.INTA at func 0: 11
LNKB: BIOS IRQ 11 for 1.8.INTA is invalid

It means that the DSDT provides interrupt handling information twice. It
seems like generally the *first* should be used (e.g. that's how Linux
behaves). We don't do that right now and I would like to get us much
testing for the patch as possible, as I don't want to break anything.

Please report any intterupt issues you have with this (and without :-))

Joerg

Index: mpacpi.c
===================================================================
RCS file: /data/repo/netbsd/src/sys/arch/x86/x86/mpacpi.c,v
retrieving revision 1.58
diff -u -p -r1.58 mpacpi.c
--- mpacpi.c    26 Apr 2008 15:13:00 -0000      1.58
+++ mpacpi.c    29 May 2008 20:14:26 -0000
@@ -690,7 +690,7 @@ mpacpi_pciroute(struct mpacpi_pcibus *mp
        ACPI_PCI_ROUTING_TABLE *ptrp;
         ACPI_HANDLE linkdev;
        char *p;
-       struct mp_intr_map *mpi;
+       struct mp_intr_map *mpi, *iter;
        struct mp_bus *mpb;
        struct pic *pic;
        unsigned dev;
@@ -714,11 +714,25 @@ mpacpi_pciroute(struct mpacpi_pcibus *mp
                        break;
                dev = ACPI_HIWORD(ptrp->Address);
 
-               mpi = &mp_intrs[mpacpi_intr_index++];
+               mpi = &mp_intrs[mpacpi_intr_index];
                mpi->bus_pin = (dev << 2) | ptrp->Pin;
                mpi->bus = mpb;
                mpi->type = MPS_INTTYPE_INT;
 
+               /*
+                * First check if an entry for this device/pin combination
+                * was already found.  Some DSDTs have more than one entry
+                * and it seems that the first is generally the right one.
+                */
+               for (iter = mpb->mb_intrs; iter != NULL; iter = iter->next) {
+                       if (iter->bus_pin == mpi->bus_pin)
+                               break;
+               }
+               if (iter != NULL)
+                       continue;
+
+               ++mpacpi_intr_index;
+
                if (ptrp->Source[0] != 0) {
                        if (mp_verbose > 1)
                                printf("pciroute: dev %d INT%c on lnkdev %s\n",