From: Alexander Duyck <alexander.h.duyck@redhat.com>
Date: Thu, 22 Jan 2015 23:51:20 +0000 (-0800)
Subject: fib_trie: Fall back to slen update on inflate/halve failure
X-Git-Url: https://git.stricted.de/?a=commitdiff_plain;h=a80e89d4c650a7c3ab74f0b2d133cc2ce9738994;p=GitHub%2FLineageOS%2FG12%2Fandroid_kernel_amlogic_linux-4.9.git

fib_trie: Fall back to slen update on inflate/halve failure

This change corrects an issue where if inflate or halve fails we were
exiting the resize function without at least updating the slen for the
node.  To correct this I have moved the update of max_size into the while
loop so that it is only decremented on a successful call to either inflate
or halve.

Signed-off-by: Alexander Duyck <alexander.h.duyck@redhat.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
---

diff --git a/net/ipv4/fib_trie.c b/net/ipv4/fib_trie.c
index 7e9031739f06..80892f565030 100644
--- a/net/ipv4/fib_trie.c
+++ b/net/ipv4/fib_trie.c
@@ -752,7 +752,7 @@ static void resize(struct trie *t, struct tnode *tn)
 {
 	struct tnode *tp = node_parent(tn), *n = NULL;
 	struct tnode __rcu **cptr;
-	int max_work;
+	int max_work = MAX_WORK;
 
 	pr_debug("In tnode_resize %p inflate_threshold=%d threshold=%d\n",
 		 tn, inflate_threshold, halve_threshold);
@@ -775,8 +775,7 @@ static void resize(struct trie *t, struct tnode *tn)
 	/* Double as long as the resulting node has a number of
 	 * nonempty nodes that are above the threshold.
 	 */
-	max_work = MAX_WORK;
-	while (should_inflate(tp, tn) && max_work--) {
+	while (should_inflate(tp, tn) && max_work) {
 		if (inflate(t, tn)) {
 #ifdef CONFIG_IP_FIB_TRIE_STATS
 			this_cpu_inc(t->stats->resize_node_skipped);
@@ -784,6 +783,7 @@ static void resize(struct trie *t, struct tnode *tn)
 			break;
 		}
 
+		max_work--;
 		tn = rtnl_dereference(*cptr);
 	}
 
@@ -794,8 +794,7 @@ static void resize(struct trie *t, struct tnode *tn)
 	/* Halve as long as the number of empty children in this
 	 * node is above threshold.
 	 */
-	max_work = MAX_WORK;
-	while (should_halve(tp, tn) && max_work--) {
+	while (should_halve(tp, tn) && max_work) {
 		if (halve(t, tn)) {
 #ifdef CONFIG_IP_FIB_TRIE_STATS
 			this_cpu_inc(t->stats->resize_node_skipped);
@@ -803,6 +802,7 @@ static void resize(struct trie *t, struct tnode *tn)
 			break;
 		}
 
+		max_work--;
 		tn = rtnl_dereference(*cptr);
 	}