netdev - Re: [RFC PATCH iwl-next v1 2/4] ice: Add ice_get_ctrl

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Date: Thu, 20 Jun 2024 08:06:20 +0200
From: Michal Schmidt <mschmidt@...hat.com>
To: Sergey Temerkhanov <sergey.temerkhanov@...el.com>
Cc: intel-wired-lan@...ts.osuosl.org, netdev@...r.kernel.org, 
	Przemek Kitszel <przemyslaw.kitszel@...el.com>
Subject: Re: [RFC PATCH iwl-next v1 2/4] ice: Add ice_get_ctrl_ptp() wrapper
 to simplify the code

On Tue, Jun 18, 2024 at 3:53 PM Sergey Temerkhanov
<sergey.temerkhanov@...el.com> wrote:
> Add ice_get_ctrl_ptp() wrapper to simplify the PTP support code
> in the functions that do not use ctrl_pf directly
>
> Reviewed-by: Przemek Kitszel <przemyslaw.kitszel@...el.com>
> Signed-off-by: Sergey Temerkhanov <sergey.temerkhanov@...el.com>
> ---
>  drivers/net/ethernet/intel/ice/ice_ptp.c | 12 ++++++++++++
>  1 file changed, 12 insertions(+)
>
> diff --git a/drivers/net/ethernet/intel/ice/ice_ptp.c b/drivers/net/ethernet/intel/ice/ice_ptp.c
> index 57e1e5a5da4a..a2578bc2af54 100644
> --- a/drivers/net/ethernet/intel/ice/ice_ptp.c
> +++ b/drivers/net/ethernet/intel/ice/ice_ptp.c
> @@ -16,6 +16,18 @@ static const struct ptp_pin_desc ice_pin_desc_e810t[] = {
>         { "U.FL2", UFL2, PTP_PF_NONE, 2, { 0, } },
>  };
>
> +static struct ice_pf *ice_get_ctrl_pf(struct ice_pf *pf)
> +{
> +       return !pf->adapter ? NULL : pf->adapter->ctrl_pf;
> +}
> +
> +static struct ice_ptp *ice_get_ctrl_ptp(struct ice_pf *pf)
> +{
> +       struct ice_pf *ctrl_pf = ice_get_ctrl_pf(pf);
> +
> +       return !ctrl_pf ? NULL : &ctrl_pf->ptp;
> +}
> +
>  /**
>   * ice_get_sma_config_e810t
>   * @hw: pointer to the hw struct
> --
> 2.43.0

The patch order is incorrect. Here you access the ctrl_pf member,
which is added later in the subsequent patch.

But more importantly, it looks unsafe to access another ice_pf this
way. The administrator may unbind a PF from the driver in any order.
Can the shared objects be moved into struct ice_adapter itself so that
cross-ice_pf access becomes unnecessary?

Michal