[Qemu-devel] [PATCH 1/3] balloon: Make functions return 0 on OK, -1 on error.

[Amit Shah <amit.shah@redhat.com>]

Current semantics of 1 on OK and 0 on error are slightly weird.
qemu_balloon() and qemu_balloon_stats() do this.  Other functions in the
file use the standard 0 and -1 return values.  This commit makes the
file consistent in returning such values.

Signed-off-by: Amit Shah <amit.shah@redhat.com>
---
 balloon.c |   14 ++++++++------
 1 files changed, 8 insertions(+), 6 deletions(-)

diff --git a/balloon.c b/balloon.c
index e1cd5fa..2b7131a 100644
--- a/balloon.c
+++ b/balloon.c
@@ -64,25 +64,26 @@ void qemu_remove_balloon_handler(void *opaque)
 static int qemu_balloon(ram_addr_t target)
 {
     if (!balloon_event_fn) {
-        return 0;
+        return -1;
     }
     trace_balloon_event(balloon_opaque, target);
     balloon_event_fn(balloon_opaque, target);
-    return 1;
+    return 0;
 }
 
 static int qemu_balloon_status(BalloonInfo *info)
 {
     if (!balloon_stat_fn) {
-        return 0;
+        return -1;
     }
     balloon_stat_fn(balloon_opaque, info);
-    return 1;
+    return 0;
 }
 
 BalloonInfo *qmp_query_balloon(Error **errp)
 {
     BalloonInfo *info;
+    int ret;
 
     if (kvm_enabled() && !kvm_has_sync_mmu()) {
         error_set(errp, QERR_KVM_MISSING_CAP, "synchronous MMU", "balloon");
@@ -91,7 +92,8 @@ BalloonInfo *qmp_query_balloon(Error **errp)
 
     info = g_malloc0(sizeof(*info));
 
-    if (qemu_balloon_status(info) == 0) {
+    ret = qemu_balloon_status(info);
+    if (ret < 0) {
         error_set(errp, QERR_DEVICE_NOT_ACTIVE, "balloon");
         qapi_free_BalloonInfo(info);
         return NULL;
@@ -120,7 +122,7 @@ int do_balloon(Monitor *mon, const QDict *params,
         return -1;
     }
     ret = qemu_balloon(target);
-    if (ret == 0) {
+    if (ret < 0) {
         qerror_report(QERR_DEVICE_NOT_ACTIVE, "balloon");
         return -1;
     }
-- 
1.7.7.3