[PATCH v2 2/2] negotiator/skipping: fix some problems in mark_common()

[Han Xin <hanxin.hx@xxxxxxxxxxxxx>]

Fixed the following problems:

1. prio_queue() should be used with clear_prio_queue(), otherwise there
   will be a memory leak.
2. It does not do duplicate protection before prio_queue_put().
   (The COMMON bit would work here, too.)
3. When it translated from recursive to iterative it kept "return"
   statements that should probably be "continue" statements.
4. It does not attempt to parse commits, and instead returns
   immediately when finding an unparsed commit. This is something
   that it did in its original version, so maybe it is by design,
   but it doesn't match the doc comment for the method.

Helped-by: Derrick Stolee <derrickstolee@xxxxxxxxxx>
Signed-off-by: Han Xin <hanxin.hx@xxxxxxxxxxxxx>
---
 negotiator/skipping.c | 10 ++++++----
 1 file changed, 6 insertions(+), 4 deletions(-)

diff --git a/negotiator/skipping.c b/negotiator/skipping.c
index c7d6ab39bc..b06dcb197b 100644
--- a/negotiator/skipping.c
+++ b/negotiator/skipping.c
@@ -85,7 +85,7 @@ static int clear_marks(const char *refname, const struct object_id *oid,
 }
 
 /*
- * Mark this SEEN commit and all its SEEN ancestors as COMMON.
+ * Mark this SEEN commit and all its parsed SEEN ancestors as COMMON.
  */
 static void mark_common(struct data *data, struct commit *seen_commit)
 {
@@ -96,18 +96,20 @@ static void mark_common(struct data *data, struct commit *seen_commit)
 	while ((c = prio_queue_get(&queue))) {
 		struct commit_list *p;
 		if (c->object.flags & COMMON)
-			return;
+			continue;
 		c->object.flags |= COMMON;
 		if (!(c->object.flags & POPPED))
 			data->non_common_revs--;
 
 		if (!c->object.parsed)
-			return;
+			continue;
 		for (p = c->parents; p; p = p->next) {
-			if (p->item->object.flags & SEEN)
+			if (p->item->object.flags & SEEN || p->item->object.flags & COMMON)
 				prio_queue_put(&queue, p->item);
 		}
 	}
+
+	clear_prio_queue(&queue);
 }
 
 /*
-- 
2.40.0