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SubjectRe: [PATCH net-next 7/7] net: marvell: prestera: fix port event handling on init
Hi Jakub,

On Thu, Feb 04, 2021 at 09:19:34PM -0800, Jakub Kicinski wrote:
> On Wed, 3 Feb 2021 18:54:58 +0200 Vadym Kochan wrote:
> > For some reason there might be a crash during ports creation if port
> > events are handling at the same time because fw may send initial
> > port event with down state.
> >
> > The crash points to cancel_delayed_work() which is called when port went
> > is down. Currently I did not find out the real cause of the issue, so
> > fixed it by cancel port stats work only if previous port's state was up
> > & runnig.
>
> Maybe you just need to move the DELAYED_WORK_INIT() earlier?
> Not sure why it's at the end of prestera_port_create(), it
> just initializes some fields.
>

Thanks for suggestion, but it does not help. Will try to find-out the
real root cause but this is the only fix I 'v came up.

> > [ 28.489791] Call trace:
> > [ 28.492259] get_work_pool+0x48/0x60
> > [ 28.495874] cancel_delayed_work+0x38/0xb0
> > [ 28.500011] prestera_port_handle_event+0x90/0xa0 [prestera]
> > [ 28.505743] prestera_evt_recv+0x98/0xe0 [prestera]
> > [ 28.510683] prestera_fw_evt_work_fn+0x180/0x228 [prestera_pci]
> > [ 28.516660] process_one_work+0x1e8/0x360
> > [ 28.520710] worker_thread+0x44/0x480
> > [ 28.524412] kthread+0x154/0x160
> > [ 28.527670] ret_from_fork+0x10/0x38
> > [ 28.531290] Code: a8c17bfd d50323bf d65f03c0 9278dc21 (f9400020)
> > [ 28.537429] ---[ end trace 5eced933df3a080b ]---
> >
> > Signed-off-by: Vadym Kochan <vadym.kochan@plvision.eu>
> > ---
> > drivers/net/ethernet/marvell/prestera/prestera_main.c | 3 ++-
> > 1 file changed, 2 insertions(+), 1 deletion(-)
> >
> > diff --git a/drivers/net/ethernet/marvell/prestera/prestera_main.c b/drivers/net/ethernet/marvell/prestera/prestera_main.c
> > index 39465e65d09b..122324dae47d 100644
> > --- a/drivers/net/ethernet/marvell/prestera/prestera_main.c
> > +++ b/drivers/net/ethernet/marvell/prestera/prestera_main.c
> > @@ -433,7 +433,8 @@ static void prestera_port_handle_event(struct prestera_switch *sw,
> > netif_carrier_on(port->dev);
> > if (!delayed_work_pending(caching_dw))
> > queue_delayed_work(prestera_wq, caching_dw, 0);
> > - } else {
> > + } else if (netif_running(port->dev) &&
> > + netif_carrier_ok(port->dev)) {
> > netif_carrier_off(port->dev);
> > if (delayed_work_pending(caching_dw))
> > cancel_delayed_work(caching_dw);
>

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