From 6a61e3ddef9be9be587a32a406ceb364e246cc15 Mon Sep 17 00:00:00 2001
From: Liam Mark <lmark@codeaurora.org>
Date: Mon, 29 Sep 2014 11:53:04 -0700
Subject: [PATCH] linux-ramdump-parser-v2: support empty lists
Allow empty lists to identified and successfully iterated.
Change-Id: Ifa13e3a8acffa2672163bd4d4ba1cb71a5c189fd
---
linux-ramdump-parser-v2/linux_list.py | 17 +++++++++++++++++
1 file changed, 17 insertions(+)
diff --git a/linux-ramdump-parser-v2/linux_list.py b/linux-ramdump-parser-v2/linux_list.py
index 119b351..c1457f5 100644
--- a/linux-ramdump-parser-v2/linux_list.py
+++ b/linux-ramdump-parser-v2/linux_list.py
@@ -32,12 +32,26 @@ class ListWalker(object):
self.last_node = node_addr
self.seen_nodes = []
+ def is_empty(self):
+ """Return True if the list is empty, False otherwise.
+
+ """
+ next_node_addr = self.last_node + self.ram_dump.field_offset('struct list_head', 'next')
+ next_node = self.ram_dump.read_word(next_node_addr)
+
+ if next_node == self.last_node:
+ return True
+ else:
+ return False
+
def walk(self, node_addr, func, *args):
"""Walk the linked list starting at `node_addr', calling `func' on
each node. `func' will be passed the current node and *args,
if given.
"""
+ if self.is_empty() == True:
+ return
while True:
if node_addr == 0:
@@ -65,6 +79,9 @@ class ListWalker(object):
if given.
"""
+ if self.is_empty() == True:
+ return
+
node_addr = self.ram_dump.read_word(node_addr + self.ram_dump.field_offset('struct list_head', 'prev'))
while True:
if node_addr == 0:
--
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