diff --git a/reactos/drivers/input/sermouse/detect.c b/reactos/drivers/input/sermouse/detect.c
index d66011d117c..f7c8273849f 100644
--- a/reactos/drivers/input/sermouse/detect.c
+++ b/reactos/drivers/input/sermouse/detect.c
@@ -132,7 +132,7 @@ SermouseDetectLegacyDevice(
 	/* Open port */
 	Status = ObOpenObjectByPointer(
 		LowerDevice,
-		OBJ_EXCLUSIVE | OBJ_KERNEL_HANDLE,
+		OBJ_KERNEL_HANDLE,
 		NULL,
 		0,
 		NULL,
diff --git a/reactos/drivers/serial/serenum/detect.c b/reactos/drivers/serial/serenum/detect.c
index fcf2a6543c7..a10356e9a4a 100644
--- a/reactos/drivers/serial/serenum/detect.c
+++ b/reactos/drivers/serial/serenum/detect.c
@@ -467,7 +467,7 @@ SerenumDetectLegacyDevice(
 	/* Open port */
 	Status = ObOpenObjectByPointer(
 		LowerDevice,
-		OBJ_EXCLUSIVE | OBJ_KERNEL_HANDLE,
+		OBJ_KERNEL_HANDLE,
 		NULL,
 		0,
 		NULL,
diff --git a/reactos/drivers/serial/serial/rw.c b/reactos/drivers/serial/serial/rw.c
index 649f234e846..00085c15f79 100644
--- a/reactos/drivers/serial/serial/rw.c
+++ b/reactos/drivers/serial/serial/rw.c
@@ -225,8 +225,8 @@ SerialRead(
 	if (WorkItem)
 	{
 		WorkItemData->IoWorkItem = WorkItem;
-		IoQueueWorkItem(WorkItem, SerialReadWorkItem, DelayedWorkQueue, WorkItemData);
 		IoMarkIrpPending(Irp);
+		IoQueueWorkItem(WorkItem, SerialReadWorkItem, DelayedWorkQueue, WorkItemData);
 		return STATUS_PENDING;
 	}