when timeout is 0, infinite loop on the timeout request to follow UEFI spec

[mirror_edk2.git] / MdeModulePkg / Bus / Pci / EhciDxe / EhciSched.c

diff --git a/MdeModulePkg/Bus/Pci/EhciDxe/EhciSched.c b/MdeModulePkg/Bus/Pci/EhciDxe/EhciSched.c
index 27d336a1cd0813d7e0127e925ae13e5f1b9b6e84..4dc8e1abf10c4c25910967f9ad46061b129eaeae 100644 (file)
--- a/MdeModulePkg/Bus/Pci/EhciDxe/EhciSched.c
+++ b/MdeModulePkg/Bus/Pci/EhciDxe/EhciSched.c
@@ -2,7 +2,7 @@
 \r
   EHCI transfer scheduling routines.\r
 \r
-Copyright (c) 2007 - 2010, Intel Corporation. All rights reserved.<BR>\r
+Copyright (c) 2007 - 2011, 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
@@ -691,12 +691,23 @@ EhcExecTransfer (
   UINTN                   Index;\r
   UINTN                   Loop;\r
   BOOLEAN                 Finished;\r
+  BOOLEAN                 InfiniteLoop;\r
 \r
-  Status    = EFI_SUCCESS;\r
-  Loop      = (TimeOut * EHC_1_MILLISECOND / EHC_SYNC_POLL_INTERVAL) + 1;\r
-  Finished  = FALSE;\r
+  Status       = EFI_SUCCESS;\r
+  Loop         = (TimeOut * EHC_1_MILLISECOND / EHC_SYNC_POLL_INTERVAL) + 1;\r
+  Finished     = FALSE;\r
+  InfiniteLoop = FALSE;\r
 \r
-  for (Index = 0; Index < Loop; Index++) {\r
+  //\r
+  // According to UEFI spec section 16.2.4, If Timeout is 0, then the caller\r
+  // must wait for the function to be completed until EFI_SUCCESS or EFI_DEVICE_ERROR\r
+  // is returned.\r
+  //\r
+  if (TimeOut == 0) {\r
+    InfiniteLoop = TRUE;\r
+  }\r
+\r
+  for (Index = 0; InfiniteLoop || (Index < Loop); Index++) {\r
     Finished = EhcCheckUrbResult (Ehc, Urb);\r
 \r
     if (Finished) {\r