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-rw-r--r--src/libsystemd/sd-bus/bus-message.c5
-rw-r--r--src/libsystemd/sd-bus/sd-bus.c53
2 files changed, 3 insertions, 55 deletions
diff --git a/src/libsystemd/sd-bus/bus-message.c b/src/libsystemd/sd-bus/bus-message.c
index eaffa2d3a2..4768a1fa9e 100644
--- a/src/libsystemd/sd-bus/bus-message.c
+++ b/src/libsystemd/sd-bus/bus-message.c
@@ -801,9 +801,10 @@ _public_ sd_bus_message* sd_bus_message_unref(sd_bus_message *m) {
assert(m->n_ref > 0);
m->n_ref--;
- if (m->n_ref <= 0)
- message_free(m);
+ if (m->n_ref > 0)
+ return NULL;
+ message_free(m);
return NULL;
}
diff --git a/src/libsystemd/sd-bus/sd-bus.c b/src/libsystemd/sd-bus/sd-bus.c
index 1f1a4d3a14..d52afe8437 100644
--- a/src/libsystemd/sd-bus/sd-bus.c
+++ b/src/libsystemd/sd-bus/sd-bus.c
@@ -75,12 +75,6 @@ static void bus_close_fds(sd_bus *b) {
static void bus_reset_queues(sd_bus *b) {
assert(b);
- /* NOTE: We _must_ decrement b->Xqueue_size before calling
- * sd_bus_message_unref() for _each_ message. Otherwise the
- * self-reference checks in sd_bus_unref() will fire for each message.
- * We would thus recurse into sd_bus_message_unref() and trigger the
- * assert(m->n_ref > 0) */
-
while (b->rqueue_size > 0)
sd_bus_message_unref(b->rqueue[--b->rqueue_size]);
@@ -1364,53 +1358,6 @@ _public_ sd_bus *sd_bus_unref(sd_bus *bus) {
if (!bus)
return NULL;
- /* TODO/FIXME: It's naive to think REFCNT_GET() is thread-safe in any
- * way but exclusive REFCNT_DEC(). The current logic _must_ lock around
- * REFCNT_GET() until REFCNT_DEC() or two threads might end up in
- * parallel in bus_reset_queues(). But locking would totally break the
- * recursion we introduce by bus_reset_queues()...
- * (Imagine one thread in sd_bus_message_unref() setting n_ref to 0 and
- * thus calling into sd_bus_unref(). If at the same time the real
- * thread calls sd_bus_unref(), both end up with "q == true" and will
- * call into bus_reset_queues().
- * If we require the main bus to be alive until all dispatch threads
- * are done, there is no need to do ref-counts at all. So in both ways,
- * the REFCNT thing is humbug.)
- *
- * On a second note: messages are *not* required to have ->bus set nor
- * does it have to be _this_ bus that they're assigned to. This whole
- * ref-cnt checking breaks apart if a message is not assigned to us.
- * (which is _very_ easy to trigger with the current API). */
-
- if (REFCNT_GET(bus->n_ref) == bus->rqueue_size + bus->wqueue_size + 1) {
- bool q = true;
-
- for (i = 0; i < bus->rqueue_size; i++)
- if (bus->rqueue[i]->n_ref > 1) {
- q = false;
- break;
- }
-
- if (q) {
- for (i = 0; i < bus->wqueue_size; i++)
- if (bus->wqueue[i]->n_ref > 1) {
- q = false;
- break;
- }
- }
-
- /* We are the only holders on the messages, and the
- * messages are the only holders on us, so let's drop
- * the messages and thus implicitly also kill our own
- * last references.
- * bus_reset_queues() decrements the queue-size before
- * calling into sd_bus_message_unref(). Thus, it
- * protects us from recursion. */
-
- if (q)
- bus_reset_queues(bus);
- }
-
i = REFCNT_DEC(bus->n_ref);
if (i > 0)
return NULL;