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

git-svn-id: https://edk2.svn.sourceforge.net/svnroot/edk2/trunk/edk2@11343 6f19259b-4bc3-4df7-8a09-765794883524

1 files changed, 16 insertions, 5 deletions

diff --git a/MdeModulePkg/Bus/Pci/EhciDxe/EhciSched.c b/MdeModulePkg/Bus/Pci/EhciDxe/EhciSched.c
index 27d336a1cd..4dc8e1abf1 100644
--- a/MdeModulePkg/Bus/Pci/EhciDxe/EhciSched.c
+++ b/MdeModulePkg/Bus/Pci/EhciDxe/EhciSched.c
@@ -2,7 +2,7 @@
 

   EHCI transfer scheduling routines.

 

-Copyright (c) 2007 - 2010, Intel Corporation. All rights reserved.<BR>

+Copyright (c) 2007 - 2011, Intel Corporation. All rights reserved.<BR>

 This program and the accompanying materials

 are licensed and made available under the terms and conditions of the BSD License

 which accompanies this distribution.  The full text of the license may be found at

@@ -691,12 +691,23 @@ EhcExecTransfer (
   UINTN                   Index;

   UINTN                   Loop;

   BOOLEAN                 Finished;

+  BOOLEAN                 InfiniteLoop;

 

-  Status    = EFI_SUCCESS;

-  Loop      = (TimeOut * EHC_1_MILLISECOND / EHC_SYNC_POLL_INTERVAL) + 1;

-  Finished  = FALSE;

+  Status       = EFI_SUCCESS;

+  Loop         = (TimeOut * EHC_1_MILLISECOND / EHC_SYNC_POLL_INTERVAL) + 1;

+  Finished     = FALSE;

+  InfiniteLoop = FALSE;

 

-  for (Index = 0; Index < Loop; Index++) {

+  //

+  // According to UEFI spec section 16.2.4, If Timeout is 0, then the caller

+  // must wait for the function to be completed until EFI_SUCCESS or EFI_DEVICE_ERROR

+  // is returned.

+  //

+  if (TimeOut == 0) {

+    InfiniteLoop = TRUE;

+  }

+

+  for (Index = 0; InfiniteLoop || (Index < Loop); Index++) {

     Finished = EhcCheckUrbResult (Ehc, Urb);

 

     if (Finished) {