From 837c390137193e715fee20b35c0ddb164b1c4fa4 Mon Sep 17 00:00:00 2001
From: Peter Lieven <pl@kamp.de>
Date: Tue, 18 Feb 2014 13:08:39 +0100
Subject: [PATCH] block/iscsi: fix deadlock on scsi check condition

the retry logic was broken because the complete status
of the task structure was not reset. this resulted in
an infinite loop retrying the command over and over.

CC: qemu-stable@nongnu.org
Signed-off-by: Peter Lieven <pl@kamp.de>
Signed-off-by: Paolo Bonzini <pbonzini@redhat.com>
---
 block/iscsi.c | 9 ++++++++-
 1 file changed, 8 insertions(+), 1 deletion(-)

diff --git a/block/iscsi.c b/block/iscsi.c
index 41ec09709d..c77769c2c0 100644
--- a/block/iscsi.c
+++ b/block/iscsi.c
@@ -145,12 +145,13 @@ iscsi_co_generic_cb(struct iscsi_context *iscsi, int status,
 
     if (iTask->retries-- > 0 && status == SCSI_STATUS_CHECK_CONDITION
         && task->sense.key == SCSI_SENSE_UNIT_ATTENTION) {
+        error_report("iSCSI CheckCondition: %s", iscsi_get_error(iscsi));
         iTask->do_retry = 1;
         goto out;
     }
 
     if (status != SCSI_STATUS_GOOD) {
-        error_report("iSCSI: Failure. %s", iscsi_get_error(iscsi));
+        error_report("iSCSI Failure: %s", iscsi_get_error(iscsi));
     }
 
 out:
@@ -325,6 +326,7 @@ retry:
     }
 
     if (iTask.do_retry) {
+        iTask.complete = 0;
         goto retry;
     }
 
@@ -399,6 +401,7 @@ retry:
     }
 
     if (iTask.do_retry) {
+        iTask.complete = 0;
         goto retry;
     }
 
@@ -433,6 +436,7 @@ retry:
     }
 
     if (iTask.do_retry) {
+        iTask.complete = 0;
         goto retry;
     }
 
@@ -683,6 +687,7 @@ retry:
             scsi_free_scsi_task(iTask.task);
             iTask.task = NULL;
         }
+        iTask.complete = 0;
         goto retry;
     }
 
@@ -767,6 +772,7 @@ retry:
     }
 
     if (iTask.do_retry) {
+        iTask.complete = 0;
         goto retry;
     }
 
@@ -836,6 +842,7 @@ retry:
     }
 
     if (iTask.do_retry) {
+        iTask.complete = 0;
         goto retry;
     }