From: Peter P Waskiewicz Jr <peter.p.waskiewicz.jr@intel.com>
Date: Fri, 26 Dec 2008 09:35:35 +0000 (-0800)
Subject: net: Init NAPI dev_list on napi_del
X-Git-Tag: firefly_0821_release~16481^2~21
X-Git-Url: http://demsky.eecs.uci.edu/git/?a=commitdiff_plain;h=d7b06636be162d3f74c9ce5d6d0d9ea4e5d362c8;p=firefly-linux-kernel-4.4.55.git

net: Init NAPI dev_list on napi_del

The recent GRO patches introduced the NAPI removal of devices in
free_netdev.  For drivers that can change the number of queues during
driver operation, the NAPI infrastructure doesn't allow the freeing and
re-addition of NAPI entities without reloading the driver.

This change reinitializes the dev_list in each NAPI struct on delete,
instead of just deleting it (and assigning the list pointers to POISON).
Drivers that wish to remove/re-add NAPI will need to re-initialize the
netdev napi_list after removing all NAPI instances, before re-adding NAPI
devices again.

Signed-off-by: Peter P Waskiewicz Jr <peter.p.waskiewicz.jr@intel.com>
Signed-off-by: Jeff Kirsher <jeffrey.t.kirsher@intel.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
---

diff --git a/net/core/dev.c b/net/core/dev.c
index daca72e6b37b..536a8ac189c8 100644
--- a/net/core/dev.c
+++ b/net/core/dev.c
@@ -2548,7 +2548,7 @@ void netif_napi_del(struct napi_struct *napi)
 {
 	struct sk_buff *skb, *next;
 
-	list_del(&napi->dev_list);
+	list_del_init(&napi->dev_list);
 
 	for (skb = napi->gro_list; skb; skb = next) {
 		next = skb->next;