From: NeilBrown <neilb@suse.de>
Date: Wed, 9 Sep 2009 06:32:54 +0000 (+1000)
Subject: sunrpc/cache: use list_del_init for the list_head entries in cache_deferred_req
X-Git-Tag: v2.6.32-rc1~412^2~3
X-Git-Url: http://ftp.safe.ca/?p=safe%2Fjmp%2Flinux-2.6;a=commitdiff_plain;h=67e7328f1577230ef3a1430c1a7e5c07978c6e51

sunrpc/cache: use list_del_init for the list_head entries in cache_deferred_req

Using list_del_init is generally safer than list_del, and it will
allow us, in a subsequent patch, to see if an entry has already been
processed or not.

Signed-off-by: NeilBrown <neilb@suse.de>
Signed-off-by: J. Bruce Fields <bfields@citi.umich.edu>
---

diff --git a/net/sunrpc/cache.c b/net/sunrpc/cache.c
index f2895d0..4a32a30 100644
--- a/net/sunrpc/cache.c
+++ b/net/sunrpc/cache.c
@@ -529,8 +529,8 @@ static int cache_defer_req(struct cache_req *req, struct cache_head *item)
 	if (++cache_defer_cnt > DFR_MAX) {
 		dreq = list_entry(cache_defer_list.prev,
 				  struct cache_deferred_req, recent);
-		list_del(&dreq->recent);
-		list_del(&dreq->hash);
+		list_del_init(&dreq->recent);
+		list_del_init(&dreq->hash);
 		cache_defer_cnt--;
 	}
 	spin_unlock(&cache_defer_lock);
@@ -564,7 +564,7 @@ static void cache_revisit_request(struct cache_head *item)
 			dreq = list_entry(lp, struct cache_deferred_req, hash);
 			lp = lp->next;
 			if (dreq->item == item) {
-				list_del(&dreq->hash);
+				list_del_init(&dreq->hash);
 				list_move(&dreq->recent, &pending);
 				cache_defer_cnt--;
 			}
@@ -590,7 +590,7 @@ void cache_clean_deferred(void *owner)
 
 	list_for_each_entry_safe(dreq, tmp, &cache_defer_list, recent) {
 		if (dreq->owner == owner) {
-			list_del(&dreq->hash);
+			list_del_init(&dreq->hash);
 			list_move(&dreq->recent, &pending);
 			cache_defer_cnt--;
 		}