Kernel/PCI: Don't create /proc/pci if PCI is disabled

Reading from /proc/pci assumes we have PCI enabled and also enumerated.
However, if PCI is disabled for some reason, we can't allow the user to
read from it as there's no valuable data we can supply.

1 files changed, 3 insertions, 0 deletions

diff --git a/Kernel/Bus/PCI/Access.cpp b/Kernel/Bus/PCI/Access.cpp
index f33191106f..67c3cea1f2 100644
--- a/Kernel/Bus/PCI/Access.cpp
+++ b/Kernel/Bus/PCI/Access.cpp
@@ -17,6 +17,7 @@
 #include <Kernel/Memory/MemoryManager.h>
 #include <Kernel/Memory/Region.h>
 #include <Kernel/Memory/TypedMapping.h>
+#include <Kernel/ProcessExposed.h>
 #include <Kernel/Sections.h>
 
 namespace Kernel::PCI {
@@ -95,6 +96,7 @@ UNMAP_AFTER_INIT bool Access::find_and_register_pci_host_bridges_from_acpi_mcfg_
 UNMAP_AFTER_INIT bool Access::initialize_for_multiple_pci_domains(PhysicalAddress mcfg_table)
 {
     VERIFY(!Access::is_initialized());
+    ProcFSComponentRegistry::the().root_directory().add_pci_node({});
     auto* access = new Access();
     if (!access->find_and_register_pci_host_bridges_from_acpi_mcfg_table(mcfg_table))
         return false;
@@ -106,6 +108,7 @@ UNMAP_AFTER_INIT bool Access::initialize_for_multiple_pci_domains(PhysicalAddres
 UNMAP_AFTER_INIT bool Access::initialize_for_one_pci_domain()
 {
     VERIFY(!Access::is_initialized());
+    ProcFSComponentRegistry::the().root_directory().add_pci_node({});
     auto* access = new Access();
     auto host_bridge = HostBridge::must_create_with_io_access();
     access->add_host_controller(move(host_bridge));