From f491d6015fbee92db80ffca4f5832a4b3d6359bd Mon Sep 17 00:00:00 2001
From: Bill Zissimopoulos <billziss@navimatics.com>
Date: Wed, 27 Jan 2016 13:59:48 -0800
Subject: [PATCH] sys: FspVolumeTransact(): do not retry IRP completions
 immediately

---
 src/sys/volume.c | 13 +++++++++++--
 1 file changed, 11 insertions(+), 2 deletions(-)

diff --git a/src/sys/volume.c b/src/sys/volume.c
index 6977a808..fd12cc3c 100644
--- a/src/sys/volume.c
+++ b/src/sys/volume.c
@@ -521,6 +521,7 @@ NTSTATUS FspVolumeTransact(
     LARGE_INTEGER Timeout;
 
     /* process any user-mode file system responses */
+    RepostedIrp = 0;
     Response = SystemBuffer;
     BufferEnd = (PUINT8)SystemBuffer + InputBufferLength;
     for (;;)
@@ -534,13 +535,21 @@ NTSTATUS FspVolumeTransact(
             /* either IRP was canceled or a bogus Hint was provided */
             continue;
 
-        FspIopDispatchComplete(ProcessIrp, Response);
+        Result = FspIopDispatchComplete(ProcessIrp, Response);
+        if (STATUS_PENDING == Result)
+        {
+            /*
+             * The IRP has been reposted to our Ioq. Remember the first such IRP,
+             * so that we know to break the loop if we see it again.
+             */
+            if (0 == RepostedIrp)
+                RepostedIrp = ProcessIrp;
+        }
 
         Response = NextResponse;
     }
 
     /* process any retried IRP's */
-    RepostedIrp = 0;
     for (;;)
     {
         /* get the next retried IRP, but do not go beyond the first reposted IRP! */