MdeModulePkg/PciBusDxe: catch unimplemented extended config space reads

[mirror_edk2.git] / MdeModulePkg / Bus / Pci / PciBusDxe / PciCommand.c

diff --git a/MdeModulePkg/Bus/Pci/PciBusDxe/PciCommand.c b/MdeModulePkg/Bus/Pci/PciBusDxe/PciCommand.c
index 214aeecdd40a0cfbd282ab1e161d4949c722a019..6283d602207cb09d89d8330d52fde94ac3d7c152 100644 (file)
--- a/MdeModulePkg/Bus/Pci/PciBusDxe/PciCommand.c
+++ b/MdeModulePkg/Bus/Pci/PciBusDxe/PciCommand.c
@@ -236,6 +236,19 @@ LocatePciExpressCapabilityRegBlock (
       break;\r
     }\r
 \r
+    if (CapabilityEntry == MAX_UINT32) {\r
+      DEBUG ((\r
+        DEBUG_WARN,\r
+        "%a: [%02x|%02x|%02x] failed to access config space at offset 0x%x\n",\r
+        __FUNCTION__,\r
+        PciIoDevice->BusNumber,\r
+        PciIoDevice->DeviceNumber,\r
+        PciIoDevice->FunctionNumber,\r
+        CapabilityPtr\r
+        ));\r
+      break;\r
+    }\r
+\r
     CapabilityID = (UINT16) CapabilityEntry;\r
 \r
     if (CapabilityID == CapId) {\r