diff mbox series

[v1,net-next,6/9] phonet: Pass ifindex to fill_route().

Message ID 20241017183140.43028-7-kuniyu@amazon.com (mailing list archive)
State Accepted
Commit 302fc6bbcba4beee6ff5e73c2fcc257e62667d4d
Delegated to: Netdev Maintainers
Headers show
Series phonet: Convert all doit() and dumpit() to RCU. | expand

Checks

Context Check Description
netdev/series_format success Posting correctly formatted
netdev/tree_selection success Clearly marked for net-next
netdev/ynl success Generated files up to date; no warnings/errors; no diff in generated;
netdev/fixes_present success Fixes tag not required for -next series
netdev/header_inline success No static functions without inline keyword in header files
netdev/build_32bit success Errors and warnings before: 5 this patch: 5
netdev/build_tools success No tools touched, skip
netdev/cc_maintainers success CCed 5 of 5 maintainers
netdev/build_clang success Errors and warnings before: 3 this patch: 3
netdev/verify_signedoff success Signed-off-by tag matches author and committer
netdev/deprecated_api success None detected
netdev/check_selftest success No net selftest shell script
netdev/verify_fixes success No Fixes tag
netdev/build_allmodconfig_warn success Errors and warnings before: 4 this patch: 4
netdev/checkpatch success total: 0 errors, 0 warnings, 0 checks, 36 lines checked
netdev/build_clang_rust success No Rust files in patch. Skipping build
netdev/kdoc success Errors and warnings before: 0 this patch: 0
netdev/source_inline success Was 0 now: 0
netdev/contest success net-next-2024-10-19--00-00 (tests: 777)

Commit Message

Kuniyuki Iwashima Oct. 17, 2024, 6:31 p.m. UTC 
We will convert route_doit() to RCU.

route_doit() will call rtm_phonet_notify() outside of RCU due
to GFP_KERNEL, so dev will not be available in fill_route().

Let's pass ifindex directly to fill_route().

Signed-off-by: Kuniyuki Iwashima <kuniyu@amazon.com>
---
 net/phonet/pn_netlink.c | 12 ++++++------
 1 file changed, 6 insertions(+), 6 deletions(-)

Comments

Eric Dumazet Oct. 23, 2024, 3:30 p.m. UTC | #1 
On Thu, Oct 17, 2024 at 8:33 PM Kuniyuki Iwashima <kuniyu@amazon.com> wrote:
>
> We will convert route_doit() to RCU.
>
> route_doit() will call rtm_phonet_notify() outside of RCU due
> to GFP_KERNEL, so dev will not be available in fill_route().
>
> Let's pass ifindex directly to fill_route().
>
> Signed-off-by: Kuniyuki Iwashima <kuniyu@amazon.com>

Reviewed-by: Eric Dumazet <edumazet@google.com>
diff mbox series

Patch

diff --git a/net/phonet/pn_netlink.c b/net/phonet/pn_netlink.c
index 14928fa04675..c9a4215ec560 100644
--- a/net/phonet/pn_netlink.c
+++ b/net/phonet/pn_netlink.c
@@ -170,8 +170,8 @@  static int getaddr_dumpit(struct sk_buff *skb, struct netlink_callback *cb)
 
 /* Routes handling */
 
-static int fill_route(struct sk_buff *skb, struct net_device *dev, u8 dst,
-			u32 portid, u32 seq, int event)
+static int fill_route(struct sk_buff *skb, u32 ifindex, u8 dst,
+		      u32 portid, u32 seq, int event)
 {
 	struct rtmsg *rtm;
 	struct nlmsghdr *nlh;
@@ -190,8 +190,7 @@  static int fill_route(struct sk_buff *skb, struct net_device *dev, u8 dst,
 	rtm->rtm_scope = RT_SCOPE_UNIVERSE;
 	rtm->rtm_type = RTN_UNICAST;
 	rtm->rtm_flags = 0;
-	if (nla_put_u8(skb, RTA_DST, dst) ||
-	    nla_put_u32(skb, RTA_OIF, READ_ONCE(dev->ifindex)))
+	if (nla_put_u8(skb, RTA_DST, dst) || nla_put_u32(skb, RTA_OIF, ifindex))
 		goto nla_put_failure;
 	nlmsg_end(skb, nlh);
 	return 0;
@@ -210,7 +209,8 @@  void rtm_phonet_notify(int event, struct net_device *dev, u8 dst)
 			nla_total_size(1) + nla_total_size(4), GFP_KERNEL);
 	if (skb == NULL)
 		goto errout;
-	err = fill_route(skb, dev, dst, 0, 0, event);
+
+	err = fill_route(skb, dev->ifindex, dst, 0, 0, event);
 	if (err < 0) {
 		WARN_ON(err == -EMSGSIZE);
 		kfree_skb(skb);
@@ -286,7 +286,7 @@  static int route_dumpit(struct sk_buff *skb, struct netlink_callback *cb)
 		if (!dev)
 			continue;
 
-		err = fill_route(skb, dev, addr << 2,
+		err = fill_route(skb, READ_ONCE(dev->ifindex), addr << 2,
 				 NETLINK_CB(cb->skb).portid,
 				 cb->nlh->nlmsg_seq, RTM_NEWROUTE);
 		if (err < 0)