netdev - [PATCH net-next] fib: Use const struct nl_info * in rtmsg

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Date:	Thu, 17 Oct 2013 13:34:11 -0700
From:	Joe Perches <joe@...ches.com>
To:	Kristian Evensen <kristian.evensen@...il.com>
Cc:	Network Development <netdev@...r.kernel.org>
Subject: [PATCH net-next] fib: Use const struct nl_info * in rtmsg_fib

The rtmsg_fib function doesn't modify this argument so mark
it const.

Signed-off-by: Joe Perches <joe@...ches.com>
---
On Thu, 2013-10-17 at 22:14 +0200, Kristian Evensen wrote:
> Hi,

Hi Kristian.

> On Thu, Oct 17, 2013 at 7:23 PM, Joe Perches <joe@...ches.com> wrote:
> >
> > Perhaps this memset should be moved into the
> > list_for_each_entry_safe loop where cfg is used.
> 
> Thanks for your comment. I decided to put it there to avoid calling it
> for each route that will be deleted. Since the struct is never
> modified (only read in fib_rtmsg()) and we have the rtnl_lock, I
> assumed it to be safe. Are there cases where this assumption is wrong?

I didn't look too hard.
I just glanced at the prototype and saw it wasn't const.

If rtmsg_fib() doesn't modify cfg (and it doesn't seem to)
then the prototype and function should be marked const.

And you're right, it doesn't need to be inside the loop.

cheers, Joe

 net/ipv4/fib_lookup.h    | 2 +-
 net/ipv4/fib_semantics.c | 2 +-
 2 files changed, 2 insertions(+), 2 deletions(-)

diff --git a/net/ipv4/fib_lookup.h b/net/ipv4/fib_lookup.h
index af0f14a..50cfb3e 100644
--- a/net/ipv4/fib_lookup.h
+++ b/net/ipv4/fib_lookup.h
@@ -32,7 +32,7 @@ extern int fib_dump_info(struct sk_buff *skb, u32 pid, u32 seq, int event,
 			 int dst_len, u8 tos, struct fib_info *fi,
 			 unsigned int);
 extern void rtmsg_fib(int event, __be32 key, struct fib_alias *fa,
-		      int dst_len, u32 tb_id, struct nl_info *info,
+		      int dst_len, u32 tb_id, const struct nl_info *info,
 		      unsigned int nlm_flags);
 extern struct fib_alias *fib_find_alias(struct list_head *fah,
 					u8 tos, u32 prio);
diff --git a/net/ipv4/fib_semantics.c b/net/ipv4/fib_semantics.c
index d5dbca5..e63f47a 100644
--- a/net/ipv4/fib_semantics.c
+++ b/net/ipv4/fib_semantics.c
@@ -380,7 +380,7 @@ static inline size_t fib_nlmsg_size(struct fib_info *fi)
 }
 
 void rtmsg_fib(int event, __be32 key, struct fib_alias *fa,
-	       int dst_len, u32 tb_id, struct nl_info *info,
+	       int dst_len, u32 tb_id, const struct nl_info *info,
 	       unsigned int nlm_flags)
 {
 	struct sk_buff *skb;


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