commit 219e638f3b3f3e34b5cf00c0a0d536a7e0155f70
author Igor Mammedov <imammedo@redhat.com> Thu Jan 12 15:02:54 2023 +0100
committer Michael S. Tsirkin <mst@redhat.com> Sat Jan 28 06:21:29 2023 -0500
tree 060545aaeff0bcc8f0ed3a53625377fb592b744c
parent ddab4d3fae4e8cb3b1d70c9f2364987ddc18c6a3

pcihp: do not put empty PCNT in DSDT

count number of PCNT methods that actually call Notify
and if there aren't any, drop PCNT altogether.
It mostly affects 'Q35' tests where there is no root-ports
/bridges attached and 'PC' machine when ACPI PCI hotplug is
completely disabled.

Expected ASL change:

-            Method (PCNT, 0, NotSerialized)
-            {
-            }
...
         Method (_E01, 0, NotSerialized)  // _Exx: Edge-Triggered GPE
         {
-            Acquire (\_SB.PCI0.BLCK, 0xFFFF)
-            \_SB.PCI0.PCNT ()
-            Release (\_SB.PCI0.BLCK)
         }

Signed-off-by: Igor Mammedov <imammedo@redhat.com>
Message-Id: <20230112140312.3096331-23-imammedo@redhat.com>
Reviewed-by: Michael S. Tsirkin <mst@redhat.com>
Signed-off-by: Michael S. Tsirkin <mst@redhat.com>