[XS] Change in coreboot[main]: cpu/x86/smm/pci_resource_store: Allow devices with no resources

[Martin L Roth (Code Review)]

Martin L Roth has submitted this change. ( https://review.coreboot.org/c/coreboot/+/80246?usp=email )

Change subject: cpu/x86/smm/pci_resource_store: Allow devices with no resources
......................................................................

cpu/x86/smm/pci_resource_store: Allow devices with no resources

When a device with no resource is passed it will keep overwriting
the current slot. Remove the conditional and allow a PCI device
to not have any resources.

This is particular useful for the next commits that makes use
of the PCI resource store to pass UBOX devices to SMM that allow
to lock-down SMM from within an SMI handler. Those devices do
not have any resources and cannot be hardcoded in SMM as their
PCI segment group and bus number varies depending on socket
count, CPU discovery and configuration.

Change-Id: I1a1b5944c97da5be6b9794c653b5159683f492e5
Signed-off-by: Patrick Rudolph 
Reviewed-on: https://review.coreboot.org/c/coreboot/+/80246
Reviewed-by: Arthur Heymans 
Tested-by: build bot (Jenkins) 
Reviewed-by: Martin L Roth 
---
M src/cpu/x86/smm/pci_resource_store.c
1 file changed, 0 insertions(+), 4 deletions(-)

Approvals:
  build bot (Jenkins): Verified
  Martin L Roth: Looks good to me, approved
  Arthur Heymans: Looks good to me, approved

diff --git a/src/cpu/x86/smm/pci_resource_store.c b/src/cpu/x86/smm/pci_resource_store.c
index f1d3e28..b1e61a9 100644
--- a/src/cpu/x86/smm/pci_resource_store.c
+++ b/src/cpu/x86/smm/pci_resource_store.c
@@ -37,10 +37,6 @@
    	slots[i_slot].vendor_id = devices[i_dev]->vendor;
    	slots[i_slot].device_id = devices[i_dev]->device;

-		/* Use the resource list to get our BARs. */
-		if (!devices[i_dev]->resource_list)
-			continue;
-
    	size_t i_res = 0;
    	for (const struct resource *res = devices[i_dev]->resource_list; res != NULL;
    		res = res->next) {