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authorMarkus Armbruster <armbru@redhat.com>2014-04-25 12:44:22 +0200
committerAndreas Färber <afaerber@suse.de>2014-05-05 19:08:49 +0200
commit65cd9064e13f2388d3bd9c815826f5db6b0b13ec (patch)
tree1a0c27b53afbf5924ffb08482fff7d2f3732c520 /backends/rng.c
parenta7737e4496aa3c1c8c3a4b4b9d5e44875fe21e12 (diff)
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qom: Clean up fragile use of error_is_set() in set() methods
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). I guess the error_is_set(errp) in the ObjectProperty set() methods are merely fragile right now, because I can't find a call chain that 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> Signed-off-by: Andreas Färber <afaerber@suse.de>
Diffstat (limited to 'backends/rng.c')
-rw-r--r--backends/rng.c11
1 files changed, 7 insertions, 4 deletions
diff --git a/backends/rng.c b/backends/rng.c
index 8b8d5a4..0f2fc11 100644
--- a/backends/rng.c
+++ b/backends/rng.c
@@ -50,6 +50,7 @@ static void rng_backend_prop_set_opened(Object *obj, bool value, Error **errp)
{
RngBackend *s = RNG_BACKEND(obj);
RngBackendClass *k = RNG_BACKEND_GET_CLASS(s);
+ Error *local_err = NULL;
if (value == s->opened) {
return;
@@ -61,12 +62,14 @@ static void rng_backend_prop_set_opened(Object *obj, bool value, Error **errp)
}
if (k->opened) {
- k->opened(s, errp);
+ k->opened(s, &local_err);
+ if (local_err) {
+ error_propagate(errp, local_err);
+ return;
+ }
}
- if (!error_is_set(errp)) {
- s->opened = value;
- }
+ s->opened = true;
}
static void rng_backend_init(Object *obj)