bcache: fix for gc crashing when no sectors are used

Signed-off-by: Nicholas Swenson <nks@daterainc.com> Signed-off-by: Kent Overstreet <kmo@daterainc.com>
git-mirror · Dec 16, 2013 · bee63f4 · bee63f4
1 parent 97d11a6
commit bee63f4
Showing 1 changed file with 2 additions and 1 deletion.
diff --git a/drivers/md/bcache/movinggc.c b/drivers/md/bcache/movinggc.c
@@ -184,7 +184,8 @@ static bool bucket_cmp(struct bucket *l, struct bucket *r)
 
 static unsigned bucket_heap_top(struct cache *ca)
 {
-	return GC_SECTORS_USED(heap_peek(&ca->heap));
+	struct bucket *b;
+	return (b = heap_peek(&ca->heap)) ? GC_SECTORS_USED(b) : 0;
 }
 
 void bch_moving_gc(struct cache_set *c)