1 files changed, 9 insertions, 0 deletions
diff --git a/MdeModulePkg/Bus/Pci/EhciDxe/EhciSched.c b/MdeModulePkg/Bus/Pci/EhciDxe/EhciSched.c
index 5594e6699..cc6e77e38 100644
--- a/MdeModulePkg/Bus/Pci/EhciDxe/EhciSched.c
+++ b/MdeModulePkg/Bus/Pci/EhciDxe/EhciSched.c
@@ -573,6 +573,12 @@ EhcCheckUrbResult (
 
   ASSERT ((Ehc != NULL) && (Urb != NULL) && (Urb->Qh != NULL));
 
+  // The URB is already being processed, we do not want the callback to be
+  // called twice for the same URB
+  if (Urb->InProgress) {
+    return FALSE;
+  }
+
   Finished        = TRUE;
   Urb->Completed  = 0;
 
@@ -992,6 +998,9 @@ EhcMonitorAsyncRequests (
       continue;
     }
 
+    // Mark the URB as 'in-progress' to prevent the URB to be processed twice.
+    Urb->InProgress = TRUE;
+
     //
     // Flush any PCI posted write transactions from a PCI host
     // bridge to system memory.