MdeModulePkg/PciBus: Correct typos

[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 8a8b4b8faca8bc6a42106b3d1e4497a60249b5f6..a71868cbf8c7c56ae441ee9a1f19cfad3018355d 100644 (file)
--- a/MdeModulePkg/Bus/Pci/PciBusDxe/PciCommand.c
+++ b/MdeModulePkg/Bus/Pci/PciBusDxe/PciCommand.c
@@ -1,7 +1,7 @@
 /** @file\r
   PCI command register operations supporting functions implementation for PCI Bus module.\r
 \r
-Copyright (c) 2006 - 2015, Intel Corporation. All rights reserved.<BR>\r
+Copyright (c) 2006 - 2019, Intel Corporation. All rights reserved.<BR>\r
 This program and the accompanying materials\r
 are licensed and made available under the terms and conditions of the BSD License\r
 which accompanies this distribution.  The full text of the license may be found at\r
@@ -75,12 +75,12 @@ PciOperateRegister (
 }\r
 \r
 /**\r
-  Check the cpability supporting by given device.\r
+  Check the capability supporting by given device.\r
 \r
   @param PciIoDevice   Pointer to instance of PCI_IO_DEVICE.\r
 \r
-  @retval TRUE         Cpability supportted.\r
-  @retval FALSE        Cpability not supportted.\r
+  @retval TRUE         Capability supported.\r
+  @retval FALSE        Capability not supported.\r
 \r
 **/\r
 BOOLEAN\r
@@ -103,7 +103,7 @@ PciCapabilitySupport (
   @param Offset            A pointer to the offset returned.\r
   @param NextRegBlock      A pointer to the next block returned.\r
 \r
-  @retval EFI_SUCCESS      Successfuly located capability register block.\r
+  @retval EFI_SUCCESS      Successfully located capability register block.\r
   @retval EFI_UNSUPPORTED  Pci device does not support capability.\r
   @retval EFI_NOT_FOUND    Pci device support but can not find register block.\r
 \r
@@ -121,7 +121,7 @@ LocateCapabilityRegBlock (
   UINT8   CapabilityID;\r
 \r
   //\r
-  // To check the cpability of this device supports\r
+  // To check the capability of this device supports\r
   //\r
   if (!PciCapabilitySupport (PciIoDevice)) {\r
     return EFI_UNSUPPORTED;\r
@@ -173,6 +173,14 @@ LocateCapabilityRegBlock (
       return EFI_SUCCESS;\r
     }\r
 \r
+    //\r
+    // Certain PCI device may incorrectly have capability pointing to itself,\r
+    // break to avoid dead loop.\r
+    //\r
+    if (CapabilityPtr == (UINT8) (CapabilityEntry >> 8)) {\r
+      break;\r
+    }\r
+\r
     CapabilityPtr = (UINT8) (CapabilityEntry >> 8);\r
   }\r
 \r
@@ -187,7 +195,7 @@ LocateCapabilityRegBlock (
   @param Offset            A pointer to the offset returned.\r
   @param NextRegBlock      A pointer to the next block returned.\r
 \r
-  @retval EFI_SUCCESS      Successfuly located capability register block.\r
+  @retval EFI_SUCCESS      Successfully located capability register block.\r
   @retval EFI_UNSUPPORTED  Pci device does not support capability.\r
   @retval EFI_NOT_FOUND    Pci device support but can not find register block.\r
 \r