Merge remote-tracking branch 'remotes/armbru/tags/pull-error-2020-07-07-v2' into staging

Error reporting patches patches for 2020-07-07

# gpg: Signature made Fri 10 Jul 2020 14:24:42 BST
# gpg:                using RSA key 354BC8B3D7EB2A6B68674E5F3870B400EB918653
# gpg:                issuer "armbru@redhat.com"
# gpg: Good signature from "Markus Armbruster <armbru@redhat.com>" [full]
# gpg:                 aka "Markus Armbruster <armbru@pond.sub.org>" [full]
# Primary key fingerprint: 354B C8B3 D7EB 2A6B 6867  4E5F 3870 B400 EB91 8653

* remotes/armbru/tags/pull-error-2020-07-07-v2: (53 commits)
  xen: Use ERRP_GUARD()
  nbd: Use ERRP_GUARD()
  virtio-9p: Use ERRP_GUARD()
  fw_cfg: Use ERRP_GUARD()
  pflash: Use ERRP_GUARD()
  sd: Use ERRP_GUARD()
  scripts: Coccinelle script to use ERRP_GUARD()
  error: New macro ERRP_GUARD()
  hmp: Ignore Error objects where the return value suffices
  qdev: Ignore Error objects where the return value suffices
  qemu-img: Ignore Error objects where the return value suffices
  error: Avoid error_propagate() after migrate_add_blocker()
  qapi: Purge error_propagate() from QAPI core
  qapi: Smooth visitor error checking in generated code
  qapi: Smooth another visitor error checking pattern
  block/parallels: Simplify parallels_open() after previous commit
  error: Reduce unnecessary error propagation
  error: Eliminate error_propagate() manually
  error: Eliminate error_propagate() with Coccinelle, part 2
  error: Eliminate error_propagate() with Coccinelle, part 1
  ...

Signed-off-by: Peter Maydell <peter.maydell@linaro.org>

2 files changed, 9 insertions, 21 deletions

diff --git a/monitor/hmp-cmds.c b/monitor/hmp-cmds.c
index 2ec13e4cc3..ae4b6a4246 100644
--- a/monitor/hmp-cmds.c
+++ b/monitor/hmp-cmds.c
@@ -1247,7 +1247,6 @@ void hmp_migrate_set_parameter(Monitor *mon, const QDict *qdict)
     MigrateSetParameters *p = g_new0(MigrateSetParameters, 1);
     uint64_t valuebw = 0;
     uint64_t cache_size;
-    MultiFDCompression compress_type;
     Error *err = NULL;
     int val, ret;
 
@@ -1343,11 +1342,8 @@ void hmp_migrate_set_parameter(Monitor *mon, const QDict *qdict)
         break;
     case MIGRATION_PARAMETER_MULTIFD_COMPRESSION:
         p->has_multifd_compression = true;
-        visit_type_MultiFDCompression(v, param, &compress_type, &err);
-        if (err) {
-            break;
-        }
-        p->multifd_compression = compress_type;
+        visit_type_MultiFDCompression(v, param, &p->multifd_compression,
+                                      &err);
         break;
     case MIGRATION_PARAMETER_MULTIFD_ZLIB_LEVEL:
         p->has_multifd_zlib_level = true;
@@ -1359,8 +1355,7 @@ void hmp_migrate_set_parameter(Monitor *mon, const QDict *qdict)
         break;
     case MIGRATION_PARAMETER_XBZRLE_CACHE_SIZE:
         p->has_xbzrle_cache_size = true;
-        visit_type_size(v, param, &cache_size, &err);
-        if (err) {
+        if (!visit_type_size(v, param, &cache_size, &err)) {
             break;
         }
         if (cache_size > INT64_MAX || (size_t)cache_size != cache_size) {
diff --git a/monitor/monitor.c b/monitor/monitor.c
index 19dcb8fbe3..b385a3d569 100644
--- a/monitor/monitor.c
+++ b/monitor/monitor.c
@@ -657,25 +657,18 @@ int monitor_init_opts(QemuOpts *opts, Error **errp)
 {
     Visitor *v;
     MonitorOptions *options;
-    Error *local_err = NULL;
+    int ret;
 
     v = opts_visitor_new(opts);
-    visit_type_MonitorOptions(v, NULL, &options, &local_err);
+    visit_type_MonitorOptions(v, NULL, &options, errp);
     visit_free(v);
-
-    if (local_err) {
-        goto out;
+    if (!options) {
+        return -1;
     }
 
-    monitor_init(options, true, &local_err);
+    ret = monitor_init(options, true, errp);
     qapi_free_MonitorOptions(options);
-
-out:
-    if (local_err) {
-        error_propagate(errp, local_err);
-        return -1;
-    }
-    return 0;
+    return ret;
 }
 
 QemuOptsList qemu_mon_opts = {