[Xen-devel] [PATCH v2 for-4.6 1/3] tools/libxl: Do not set stream->rc in stream_complete()

[Andrew Cooper <andrew.cooper3@xxxxxxxxxx>]

Only ever set stream->rc in check_all_finished().  The first version of
the migration v2 series had separate rc and joined_rc parameters, where
this logic worked.  However when combining the two, the teardown path
fails to trigger if stream_complete() records stream->rc itself.  A side
effect of this is that stream_done() needs to take an rc parameter.

Signed-off-by: Andrew Cooper <andrew.cooper3@xxxxxxxxxx>
---
CC: Ian Campbell <Ian.Campbell@xxxxxxxxxx>
CC: Ian Jackson <Ian.Jackson@xxxxxxxxxxxxx>
CC: Wei Liu <wei.liu2@xxxxxxxxxx>
---
 tools/libxl/libxl_stream_read.c  |   10 ++++------
 tools/libxl/libxl_stream_write.c |   10 ++++------
 2 files changed, 8 insertions(+), 12 deletions(-)

diff --git a/tools/libxl/libxl_stream_read.c b/tools/libxl/libxl_stream_read.c
index 32a3551..4458aec 100644
--- a/tools/libxl/libxl_stream_read.c
+++ b/tools/libxl/libxl_stream_read.c
@@ -112,7 +112,7 @@ static void stream_complete(libxl__egc *egc,
 static void checkpoint_done(libxl__egc *egc,
                             libxl__stream_read_state *stream, int rc);
 static void stream_done(libxl__egc *egc,
-                        libxl__stream_read_state *stream);
+                        libxl__stream_read_state *stream, int rc);
 static void conversion_done(libxl__egc *egc,
                             libxl__conversion_helper_state *chs, int rc);
 static void check_all_finished(libxl__egc *egc,
@@ -669,9 +669,7 @@ static void stream_complete(libxl__egc *egc,
         return;
     }
 
-    if (!stream->rc)
-        stream->rc = rc;
-    stream_done(egc, stream);
+    stream_done(egc, stream, rc);
 }
 
 static void checkpoint_done(libxl__egc *egc,
@@ -695,7 +693,7 @@ static void checkpoint_done(libxl__egc *egc,
 }
 
 static void stream_done(libxl__egc *egc,
-                        libxl__stream_read_state *stream)
+                        libxl__stream_read_state *stream, int rc)
 {
     libxl__sr_record_buf *rec, *trec;
 
@@ -720,7 +718,7 @@ static void stream_done(libxl__egc *egc,
     LIBXL_STAILQ_FOREACH_SAFE(rec, &stream->record_queue, entry, trec)
         free_record(rec);
 
-    check_all_finished(egc, stream, stream->rc);
+    check_all_finished(egc, stream, rc);
 }
 
 void libxl__xc_domain_restore_done(libxl__egc *egc, void *dcs_void,
diff --git a/tools/libxl/libxl_stream_write.c b/tools/libxl/libxl_stream_write.c
index 5bff52b..ec46105 100644
--- a/tools/libxl/libxl_stream_write.c
+++ b/tools/libxl/libxl_stream_write.c
@@ -55,7 +55,7 @@ static void stream_success(libxl__egc *egc,
 static void stream_complete(libxl__egc *egc,
                             libxl__stream_write_state *stream, int rc);
 static void stream_done(libxl__egc *egc,
-                        libxl__stream_write_state *stream);
+                        libxl__stream_write_state *stream, int rc);
 static void checkpoint_done(libxl__egc *egc,
                             libxl__stream_write_state *stream,
                             int rc);
@@ -492,13 +492,11 @@ static void stream_complete(libxl__egc *egc,
         return;
     }
 
-    if (!stream->rc)
-        stream->rc = rc;
-    stream_done(egc, stream);
+    stream_done(egc, stream, rc);
 }
 
 static void stream_done(libxl__egc *egc,
-                        libxl__stream_write_state *stream)
+                        libxl__stream_write_state *stream, int rc)
 {
     assert(stream->running);
     stream->running = false;
@@ -507,7 +505,7 @@ static void stream_done(libxl__egc *egc,
         libxl__carefd_close(stream->emu_carefd);
     free(stream->emu_body);
 
-    check_all_finished(egc, stream, stream->rc);
+    check_all_finished(egc, stream, rc);
 }
 
 static void checkpoint_done(libxl__egc *egc,
-- 
1.7.10.4


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