| Message ID | 20210105190725.1736246-1-kuba@kernel.org |
|---|---|
| State | New |
| Headers | show |
| Series | [net,v2] net: bareudp: add missing error handling for bareudp_link_config() | expand |
On Tue, Jan 5, 2021 at 11:07 AM Jakub Kicinski <kuba@kernel.org> wrote: > > .dellink does not get called after .newlink fails, > bareudp_newlink() must undo what bareudp_configure() > has done if bareudp_link_config() fails. > > v2: call bareudp_dellink(), like bareudp_dev_create() does Thanks for the update. Just one question below. > > Fixes: 571912c69f0e ("net: UDP tunnel encapsulation module for tunnelling different protocols like MPLS, IP, NSH etc.") > Signed-off-by: Jakub Kicinski <kuba@kernel.org> > --- > drivers/net/bareudp.c | 22 ++++++++++++++-------- > 1 file changed, 14 insertions(+), 8 deletions(-) > > diff --git a/drivers/net/bareudp.c b/drivers/net/bareudp.c > index 708171c0d628..85de5f96c02b 100644 > --- a/drivers/net/bareudp.c > +++ b/drivers/net/bareudp.c > @@ -645,11 +645,20 @@ static int bareudp_link_config(struct net_device *dev, > return 0; > } > > +static void bareudp_dellink(struct net_device *dev, struct list_head *head) > +{ > + struct bareudp_dev *bareudp = netdev_priv(dev); > + > + list_del(&bareudp->next); > + unregister_netdevice_queue(dev, head); > +} > + > static int bareudp_newlink(struct net *net, struct net_device *dev, > struct nlattr *tb[], struct nlattr *data[], > struct netlink_ext_ack *extack) > { > struct bareudp_conf conf; > + LIST_HEAD(list_kill); > int err; > > err = bareudp2info(data, &conf, extack); > @@ -662,17 +671,14 @@ static int bareudp_newlink(struct net *net, struct net_device *dev, > > err = bareudp_link_config(dev, tb); > if (err) > - return err; > + goto err_unconfig; > > return 0; > -} > - > -static void bareudp_dellink(struct net_device *dev, struct list_head *head) > -{ > - struct bareudp_dev *bareudp = netdev_priv(dev); > > - list_del(&bareudp->next); > - unregister_netdevice_queue(dev, head); > +err_unconfig: > + bareudp_dellink(dev, &list_kill); > + unregister_netdevice_many(&list_kill); Why do we need unregister_netdevice_many() here? I think bareudp_dellink(dev, NULL) is sufficient as we always have one instance to unregister? (For the same reason, bareudp_dev_create() does not need it either.) Thanks.
On Tue, 5 Jan 2021 12:38:54 -0800 Cong Wang wrote: > On Tue, Jan 5, 2021 at 11:07 AM Jakub Kicinski <kuba@kernel.org> wrote: > > +static void bareudp_dellink(struct net_device *dev, struct list_head *head) > > +{ > > + struct bareudp_dev *bareudp = netdev_priv(dev); > > + > > + list_del(&bareudp->next); > > + unregister_netdevice_queue(dev, head); > > +} > > + > > static int bareudp_newlink(struct net *net, struct net_device *dev, > > struct nlattr *tb[], struct nlattr *data[], > > struct netlink_ext_ack *extack) > > { > > struct bareudp_conf conf; > > + LIST_HEAD(list_kill); > > int err; > > > > err = bareudp2info(data, &conf, extack); > > @@ -662,17 +671,14 @@ static int bareudp_newlink(struct net *net, struct net_device *dev, > > > > err = bareudp_link_config(dev, tb); > > if (err) > > - return err; > > + goto err_unconfig; > > > > return 0; > > -} > > - > > -static void bareudp_dellink(struct net_device *dev, struct list_head *head) > > -{ > > - struct bareudp_dev *bareudp = netdev_priv(dev); > > > > - list_del(&bareudp->next); > > - unregister_netdevice_queue(dev, head); > > +err_unconfig: > > + bareudp_dellink(dev, &list_kill); > > + unregister_netdevice_many(&list_kill); > > Why do we need unregister_netdevice_many() here? I think > bareudp_dellink(dev, NULL) is sufficient as we always have > one instance to unregister? > > (For the same reason, bareudp_dev_create() does not need it > either.) Ack, I'm following how bareudp_dev_create() is written. I can follow up in net-next and change both, sounds good?
Hello: This patch was applied to netdev/net.git (refs/heads/master): On Tue, 5 Jan 2021 11:07:25 -0800 you wrote: > .dellink does not get called after .newlink fails, > bareudp_newlink() must undo what bareudp_configure() > has done if bareudp_link_config() fails. > > v2: call bareudp_dellink(), like bareudp_dev_create() does > > Fixes: 571912c69f0e ("net: UDP tunnel encapsulation module for tunnelling different protocols like MPLS, IP, NSH etc.") > Signed-off-by: Jakub Kicinski <kuba@kernel.org> > > [...] Here is the summary with links: - [net,v2] net: bareudp: add missing error handling for bareudp_link_config() https://git.kernel.org/netdev/net/c/94bcfdbff0c2 You are awesome, thank you! -- Deet-doot-dot, I am a bot. https://korg.docs.kernel.org/patchwork/pwbot.html
diff --git a/drivers/net/bareudp.c b/drivers/net/bareudp.c index 708171c0d628..85de5f96c02b 100644 --- a/drivers/net/bareudp.c +++ b/drivers/net/bareudp.c @@ -645,11 +645,20 @@ static int bareudp_link_config(struct net_device *dev, return 0; } +static void bareudp_dellink(struct net_device *dev, struct list_head *head) +{ + struct bareudp_dev *bareudp = netdev_priv(dev); + + list_del(&bareudp->next); + unregister_netdevice_queue(dev, head); +} + static int bareudp_newlink(struct net *net, struct net_device *dev, struct nlattr *tb[], struct nlattr *data[], struct netlink_ext_ack *extack) { struct bareudp_conf conf; + LIST_HEAD(list_kill); int err; err = bareudp2info(data, &conf, extack); @@ -662,17 +671,14 @@ static int bareudp_newlink(struct net *net, struct net_device *dev, err = bareudp_link_config(dev, tb); if (err) - return err; + goto err_unconfig; return 0; -} - -static void bareudp_dellink(struct net_device *dev, struct list_head *head) -{ - struct bareudp_dev *bareudp = netdev_priv(dev); - list_del(&bareudp->next); - unregister_netdevice_queue(dev, head); +err_unconfig: + bareudp_dellink(dev, &list_kill); + unregister_netdevice_many(&list_kill); + return err; } static size_t bareudp_get_size(const struct net_device *dev)
.dellink does not get called after .newlink fails, bareudp_newlink() must undo what bareudp_configure() has done if bareudp_link_config() fails. v2: call bareudp_dellink(), like bareudp_dev_create() does Fixes: 571912c69f0e ("net: UDP tunnel encapsulation module for tunnelling different protocols like MPLS, IP, NSH etc.") Signed-off-by: Jakub Kicinski <kuba@kernel.org> --- drivers/net/bareudp.c | 22 ++++++++++++++-------- 1 file changed, 14 insertions(+), 8 deletions(-)