ArmPkg/BdsLib: Prevent a hang in BdsConnectDevicePath() when a sub-device path is not found

Some device paths were making BdsConnectDevicePath() hang.
To prevent these hangs we check if the handle returned by
gBS->LocateDevicePath() is the same after each iteration.

An example of a device path that hangs:
PciRoot(0x0)/Pci(0x1,0x0)/USB(0x0,0x0)/USB(0x3,0x0)/HD(...)
The connect controller function manages to find PciRoot()/Pci(0x1,0x0)
but the USB driver does not produce USB(0x0,0x0)/USB(0x3,0x0) and
returns EFI_SUCCESS on its initialization.

Contributed-under: TianoCore Contribution Agreement 1.0
Signed-off-by: Olivier Martin <olivier.martin@arm.com>



git-svn-id: https://svn.code.sf.net/p/edk2/code/trunk/edk2@15835 6f19259b-4bc3-4df7-8a09-765794883524

3 files changed, 22 insertions, 9 deletions

diff --git a/ArmPkg/Library/BdsLib/BdsFilePath.c b/ArmPkg/Library/BdsLib/BdsFilePath.c
index 710821cd0..f26ba39dd 100644
--- a/ArmPkg/Library/BdsLib/BdsFilePath.c
+++ b/ArmPkg/Library/BdsLib/BdsFilePath.c
@@ -311,27 +311,40 @@ BdsConnectAndUpdateDevicePath (
   EFI_DEVICE_PATH*            Remaining;

   EFI_DEVICE_PATH*            NewDevicePath;

   EFI_STATUS                  Status;

+  EFI_HANDLE                  PreviousHandle;

 

   if ((DevicePath == NULL) || (*DevicePath == NULL) || (Handle == NULL)) {

     return EFI_INVALID_PARAMETER;

   }

 

+  PreviousHandle = NULL;

   do {

     Remaining = *DevicePath;

+

     // The LocateDevicePath() function locates all devices on DevicePath that support Protocol and returns

     // the handle to the device that is closest to DevicePath. On output, the device path pointer is modified

     // to point to the remaining part of the device path

     Status = gBS->LocateDevicePath (&gEfiDevicePathProtocolGuid, &Remaining, Handle);

+

     if (!EFI_ERROR (Status)) {

-      // Recursive = FALSE: We do not want to start all the device tree

-      Status = gBS->ConnectController (*Handle, NULL, Remaining, FALSE);

-    }

+      if (*Handle == PreviousHandle) {

+        //

+        // If no forward progress is made try invoking the Dispatcher.

+        // A new FV may have been added to the system and new drivers

+        // may now be found.

+        // Status == EFI_SUCCESS means a driver was dispatched

+        // Status == EFI_NOT_FOUND means no new drivers were dispatched

+        //

+        Status = gDS->Dispatch ();

+      }

 

-    /*// We need to check if RemainingDevicePath does not point on the last node. Otherwise, calling

-    // NextDevicePathNode () will return an undetermined Device Path Node

-    if (!IsDevicePathEnd (RemainingDevicePath)) {

-      RemainingDevicePath = NextDevicePathNode (RemainingDevicePath);

-    }*/

+      if (!EFI_ERROR (Status)) {

+        PreviousHandle = *Handle;

+

+        // Recursive = FALSE: We do not want to start the whole device tree

+        Status = gBS->ConnectController (*Handle, NULL, Remaining, FALSE);

+      }

+    }

   } while (!EFI_ERROR (Status) && !IsDevicePathEnd (Remaining));

 

   if (!EFI_ERROR (Status)) {

diff --git a/ArmPkg/Library/BdsLib/BdsHelper.c b/ArmPkg/Library/BdsLib/BdsHelper.c
index 1d4aa3572..7f83c2be8 100644
--- a/ArmPkg/Library/BdsLib/BdsHelper.c
+++ b/ArmPkg/Library/BdsLib/BdsHelper.c
@@ -14,7 +14,6 @@
 

 #include "BdsInternal.h"

 

-#include <Library/DxeServicesTableLib.h>

 #include <Library/HobLib.h>

 #include <Library/TimerLib.h>

 #include <Library/PrintLib.h>

diff --git a/ArmPkg/Library/BdsLib/BdsInternal.h b/ArmPkg/Library/BdsLib/BdsInternal.h
index 88117016c..9b5d3a4ff 100644
--- a/ArmPkg/Library/BdsLib/BdsInternal.h
+++ b/ArmPkg/Library/BdsLib/BdsInternal.h
@@ -19,6 +19,7 @@
 #include <Library/ArmLib.h>

 #include <Library/BaseLib.h>

 #include <Library/BaseMemoryLib.h>

+#include <Library/DxeServicesTableLib.h>

 #include <Library/HobLib.h>

 #include <Library/UefiBootServicesTableLib.h>

 #include <Library/UefiLib.h>