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authorMarkus Armbruster <armbru@redhat.com>2014-05-02 13:26:37 +0200
committerLuiz Capitulino <lcapitulino@redhat.com>2014-05-09 09:11:31 -0400
commitee16ce93373dda1faa4aa1bb4d99bcdf158f7d7a (patch)
tree6c84a4133be7d4b545724b096b298a2914d6a34b /qapi
parent196857f8bfd2d34a170c3de808dc44bd6da22f4a (diff)
downloadqemu-arm-ee16ce93373dda1faa4aa1bb4d99bcdf158f7d7a.tar.gz
qapi: Clean up fragile use of error_is_set()
Using error_is_set(ERRP) to find out whether a function failed is either wrong, fragile, or unnecessarily opaque. It's wrong when ERRP may be null, because errors go undetected when it is. It's fragile when proving ERRP non-null involves a non-local argument. Else, it's unnecessarily opaque (see commit 84d18f0). The error_is_set(errp) in do_qmp_dispatch() is merely fragile, because the caller never passes a null errp argument. Make the code more robust and more obviously correct: receive the error in a local variable, then propagate it through the parameter. Signed-off-by: Markus Armbruster <armbru@redhat.com> Reviewed-by: Eric Blake <eblake@redhat.com> Reviewed-by: Michael Roth <mdroth@linux.vnet.ibm.com> Signed-off-by: Luiz Capitulino <lcapitulino@redhat.com>
Diffstat (limited to 'qapi')
-rw-r--r--qapi/qmp-dispatch.c15
1 files changed, 8 insertions, 7 deletions
diff --git a/qapi/qmp-dispatch.c b/qapi/qmp-dispatch.c
index 187af56b86..168b083c87 100644
--- a/qapi/qmp-dispatch.c
+++ b/qapi/qmp-dispatch.c
@@ -62,6 +62,7 @@ static QDict *qmp_dispatch_check_obj(const QObject *request, Error **errp)
static QObject *do_qmp_dispatch(QObject *request, Error **errp)
{
+ Error *local_err = NULL;
const char *command;
QDict *args, *dict;
QmpCommand *cmd;
@@ -93,13 +94,13 @@ static QObject *do_qmp_dispatch(QObject *request, Error **errp)
switch (cmd->type) {
case QCT_NORMAL:
- cmd->fn(args, &ret, errp);
- if (!error_is_set(errp)) {
- if (cmd->options & QCO_NO_SUCCESS_RESP) {
- g_assert(!ret);
- } else if (!ret) {
- ret = QOBJECT(qdict_new());
- }
+ cmd->fn(args, &ret, &local_err);
+ if (local_err) {
+ error_propagate(errp, local_err);
+ } else if (cmd->options & QCO_NO_SUCCESS_RESP) {
+ g_assert(!ret);
+ } else if (!ret) {
+ ret = QOBJECT(qdict_new());
}
break;
}