lkml.org 
[lkml]   [2022]   [Jul]   [18]   [last100]   RSS Feed
Views: [wrap][no wrap]   [headers]  [forward] 
 
Messages in this thread
/
Date
From
SubjectRe: [net-next PATCH v3 2/5] net: ethernet: stmicro: stmmac: first disable all queues in release
On Sun, Jul 17, 2022 at 01:07:59AM +0200, Christian Marangi wrote:
> Disable all queues before tx_disable in stmmac_release to prevent a
> corner case where packet may be still queued at the same time tx_disable
> is called resulting in kernel panic if some packet still has to be
> processed.
>
> Signed-off-by: Christian Marangi <ansuelsmth@gmail.com>
> ---
> drivers/net/ethernet/stmicro/stmmac/stmmac_main.c | 10 +++++-----
> 1 file changed, 5 insertions(+), 5 deletions(-)
>
> diff --git a/drivers/net/ethernet/stmicro/stmmac/stmmac_main.c b/drivers/net/ethernet/stmicro/stmmac/stmmac_main.c
> index 5578abb14949..1854dcdd6095 100644
> --- a/drivers/net/ethernet/stmicro/stmmac/stmmac_main.c
> +++ b/drivers/net/ethernet/stmicro/stmmac/stmmac_main.c
> @@ -3758,6 +3758,11 @@ static int stmmac_release(struct net_device *dev)
> struct stmmac_priv *priv = netdev_priv(dev);
> u32 chan;
>
> + stmmac_disable_all_queues(priv);
> +
> + for (chan = 0; chan < priv->plat->tx_queues_to_use; chan++)
> + hrtimer_cancel(&priv->tx_queue[chan].txtimer);
> +
> netif_tx_disable(dev);

Is there a reason not to call phylink_stop() as the very first thing in
this function? That will bring the link (and therefore carrier) down
before phylink_stop() returns which should also prevent packets being
queued into the driver for transmission.

Thanks.

--
RMK's Patch system: https://www.armlinux.org.uk/developer/patches/
FTTP is here! 40Mbps down 10Mbps up. Decent connectivity at last!

\
 
 \ /
  Last update: 2022-07-18 11:21    [W:0.065 / U:0.200 seconds]
©2003-2020 Jasper Spaans|hosted at Digital Ocean and TransIP|Read the blog|Advertise on this site