On Thu, Feb 02, 2017 at 03:12:55PM +0100, Andreas Schultz wrote:
> Hi,
>
> ----- On Feb 2, 2017, at 2:56 PM, pablo pa...@netfilter.org wrote:
>
> > On Mon, Jan 30, 2017 at 05:37:12PM +0100, Andreas Schultz wrote:
> >> Having the socket present in context simplifies the sending logic.
> >> It also fixes the invalid assumption that we have to use the same
> >> sending socket for all client IP's on a specific gtp interface.
> >>
> >> Signed-off-by: Andreas Schultz <aschu...@tpip.net>
> >> ---
> >> drivers/net/gtp.c | 72
> >> ++++++++++++++++++++++++++++++-------------------------
> >> 1 file changed, 39 insertions(+), 33 deletions(-)
> >>
> >> diff --git a/drivers/net/gtp.c b/drivers/net/gtp.c
> >> index 68c6c9b..ff00597 100644
> >> --- a/drivers/net/gtp.c
> >> +++ b/drivers/net/gtp.c
> > [...]
> >> @@ -984,16 +966,26 @@ static int ipv4_pdp_add(struct gtp_dev *gtp, struct
> >> genl_info *info)
> >> return 0;
> >> }
> >>
> >> +static void pdp_context_free(struct rcu_head *head)
> >> +{
> >> + struct pdp_ctx *pctx = container_of(head, struct pdp_ctx, rcu_head);
> >> +
> >> + sock_put(pctx->sk);
> >> + kfree(pctx);
> >> +}
> >> +
> >> static void pdp_context_delete(struct pdp_ctx *pctx)
> >> {
> >> hlist_del_rcu(&pctx->hlist_tid);
> >> hlist_del_rcu(&pctx->hlist_addr);
> >> - kfree(pctx);
> >> + call_rcu(&pctx->rcu_head, pdp_context_free);
> >
> > This is fixing incorrect rcu conversion in 4/6. Please, fix this there.
>
> Ehm, right, but the kfree in 4/6 could have been a kfree_rcu instead without
> the call_rcu.
>
> Do you prefer to introduce the call_rcu in 4/6 and then just add the sock_put
> in this patch or should I change 4/6 to kfree_rcu and do the call_rcu
> conversion here?
I suggest you just call kfree_rcu() from 4/6.
Regarding holding socket reference, see my comment for patch 1/6.
