diff options
| -rw-r--r-- | lib/rbtree.c | 21 |
1 files changed, 13 insertions, 8 deletions
diff --git a/lib/rbtree.c b/lib/rbtree.c index 08926709b4f9..61cdd0e3e538 100644 --- a/lib/rbtree.c +++ b/lib/rbtree.c @@ -107,8 +107,8 @@ void rb_insert_color(struct rb_node *node, struct rb_root *root) gparent = rb_red_parent(parent); - if (parent == gparent->rb_left) { - tmp = gparent->rb_right; + tmp = gparent->rb_right; + if (parent != tmp) { /* parent == gparent->rb_left */ if (tmp && rb_is_red(tmp)) { /* * Case 1 - color flips @@ -131,7 +131,8 @@ void rb_insert_color(struct rb_node *node, struct rb_root *root) continue; } - if (parent->rb_right == node) { + tmp = parent->rb_right; + if (node == tmp) { /* * Case 2 - left rotate at parent * @@ -151,6 +152,7 @@ void rb_insert_color(struct rb_node *node, struct rb_root *root) RB_BLACK); rb_set_parent_color(parent, node, RB_RED); parent = node; + tmp = node->rb_right; } /* @@ -162,7 +164,7 @@ void rb_insert_color(struct rb_node *node, struct rb_root *root) * / \ * n U */ - gparent->rb_left = tmp = parent->rb_right; + gparent->rb_left = tmp; /* == parent->rb_right */ parent->rb_right = gparent; if (tmp) rb_set_parent_color(tmp, gparent, RB_BLACK); @@ -180,7 +182,8 @@ void rb_insert_color(struct rb_node *node, struct rb_root *root) continue; } - if (parent->rb_left == node) { + tmp = parent->rb_left; + if (node == tmp) { /* Case 2 - right rotate at parent */ parent->rb_left = tmp = node->rb_right; node->rb_right = parent; @@ -189,10 +192,11 @@ void rb_insert_color(struct rb_node *node, struct rb_root *root) RB_BLACK); rb_set_parent_color(parent, node, RB_RED); parent = node; + tmp = node->rb_left; } /* Case 3 - left rotate at gparent */ - gparent->rb_right = tmp = parent->rb_left; + gparent->rb_right = tmp; /* == parent->rb_left */ parent->rb_left = gparent; if (tmp) rb_set_parent_color(tmp, gparent, RB_BLACK); @@ -223,8 +227,9 @@ static void __rb_erase_color(struct rb_node *node, struct rb_node *parent, break; } else if (!parent) { break; - } else if (parent->rb_left == node) { - sibling = parent->rb_right; + } + sibling = parent->rb_right; + if (node != sibling) { /* node == parent->rb_left */ if (rb_is_red(sibling)) { /* * Case 1 - left rotate at parent |
