netdev - Re: [PATCH net] net: microchip: sparx5: fix PTP init/deinit not checking all ports

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Date:   Fri, 3 Feb 2023 10:24:04 +0100
From:   Horatiu Vultur <horatiu.vultur@...rochip.com>
To:     Casper Andersson <casper.casan@...il.com>
CC:     "David S. Miller" <davem@...emloft.net>,
        Eric Dumazet <edumazet@...gle.com>,
        Jakub Kicinski <kuba@...nel.org>,
        Paolo Abeni <pabeni@...hat.com>,
        Lars Povlsen <lars.povlsen@...rochip.com>,
        "Steen Hegelund" <Steen.Hegelund@...rochip.com>,
        Daniel Machon <daniel.machon@...rochip.com>,
        <UNGLinuxDriver@...rochip.com>,
        "Richard Cochran" <richardcochran@...il.com>,
        <netdev@...r.kernel.org>
Subject: Re: [PATCH net] net: microchip: sparx5: fix PTP init/deinit not
 checking all ports

The 02/03/2023 09:55, Casper Andersson wrote:

> 
> Check all ports instead of just port_count ports. PTP init was only
> checking ports 0 to port_count. If the hardware ports are not mapped
> starting from 0 then they would be missed, e.g. if only ports 20-30 were
> mapped it would attempt to init ports 0-10, resulting in NULL pointers
> when attempting to timestamp. Now it will init all mapped ports.
> 
> Fixes: 70dfe25cd866 ("net: sparx5: Update extraction/injection for timestamping")
> Signed-off-by: Casper Andersson <casper.casan@...il.com>

Reviewed-by: Horatiu Vultur <horatiu.vultur@...rochip.com>

> ---
>  drivers/net/ethernet/microchip/sparx5/sparx5_ptp.c | 4 ++--
>  1 file changed, 2 insertions(+), 2 deletions(-)
> 
> diff --git a/drivers/net/ethernet/microchip/sparx5/sparx5_ptp.c b/drivers/net/ethernet/microchip/sparx5/sparx5_ptp.c
> index 0ed1ea7727c5..69e76634f9aa 100644
> --- a/drivers/net/ethernet/microchip/sparx5/sparx5_ptp.c
> +++ b/drivers/net/ethernet/microchip/sparx5/sparx5_ptp.c
> @@ -633,7 +633,7 @@ int sparx5_ptp_init(struct sparx5 *sparx5)
>         /* Enable master counters */
>         spx5_wr(PTP_PTP_DOM_CFG_PTP_ENA_SET(0x7), sparx5, PTP_PTP_DOM_CFG);
> 
> -       for (i = 0; i < sparx5->port_count; i++) {
> +       for (i = 0; i < SPX5_PORTS; i++) {
>                 port = sparx5->ports[i];
>                 if (!port)
>                         continue;
> @@ -649,7 +649,7 @@ void sparx5_ptp_deinit(struct sparx5 *sparx5)
>         struct sparx5_port *port;
>         int i;
> 
> -       for (i = 0; i < sparx5->port_count; i++) {
> +       for (i = 0; i < SPX5_PORTS; i++) {
>                 port = sparx5->ports[i];
>                 if (!port)
>                         continue;
> --
> 2.34.1
> 

-- 
/Horatiu