From mboxrd@z Thu Jan  1 00:00:00 1970
From: Thomas Richter <thor@math.tu-berlin.de>
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Date: Tue, 07 Oct 2014 16:17:36 +0200
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To: "Rafael J. Wysocki" <rjw@rjwysocki.net>
Cc: tianyu.lan@intel.com, paul.s.diefenbaugh@intel.com, jun.nakajima@intel.com, gjohnson@austin.ibm.com, lenb@kernel.org, rui.zhang@intel.com, linux-acpi@vger.kernel.org

Hi Rafael,

> And can you please actually post a patch?  The above is just a piece of C code
> entirely out of context.
Actually, it was rather supposed to start a discussion because I have 
almost no experience with the ACPI subsystem.

Anyhow, here is the same in a (hopefully) well-formed patch file, tested 
on a Fujitsu S6010 and an IBM R31 running
the 3.17 kernel.

Thanks,
     Thomas


Signed-off-by: Thomas Richter <thor@math.tu-berlin.de>
--- linux-3.17/arch/x86/kernel/acpi/boot.c.old  2014-10-07 
15:43:44.000000000 +0200
+++ linux-3.17/arch/x86/kernel/acpi/boot.c      2014-10-07 
16:04:33.000000000 +0200
@@ -609,9 +609,23 @@
         if (irq >= 0) {
                 *irqp = irq;
                 return 0;
-       }
+       } else {
+               unsigned int i;
+
+               for (i = 0; i < NR_IRQS_LEGACY; i++) {
+                       if (isa_irq_to_gsi[i] == gsi) {
+                               *irqp = i;
+                               return 0;
+                       }
+               }
+
+               if (gsi >= NR_IRQS_LEGACY)
+                       *irqp = gsi;
+               else
+                       *irqp = gsi_top + gsi;

-       return -1;
+               return 0;
+       }
  }
  EXPORT_SYMBOL_GPL(acpi_gsi_to_irq);