netdev - Re: [PATCH net v2] octeon_ep: explicitly test for firmware ready value

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Date: Thu, 7 Dec 2023 09:45:15 +0100
From: Michal Schmidt <mschmidt@...hat.com>
To: Shinas Rasheed <srasheed@...vell.com>
Cc: netdev@...r.kernel.org, linux-kernel@...r.kernel.org, hgani@...vell.com, 
	vimleshk@...vell.com, egallen@...hat.com, pabeni@...hat.com, horms@...nel.org, 
	kuba@...nel.org, davem@...emloft.net, wizhao@...hat.com, konguyen@...hat.com, 
	Veerasenareddy Burru <vburru@...vell.com>, Sathesh Edara <sedara@...vell.com>, 
	Eric Dumazet <edumazet@...gle.com>, Abhijit Ayarekar <aayarekar@...vell.com>, 
	Satananda Burla <sburla@...vell.com>
Subject: Re: [PATCH net v2] octeon_ep: explicitly test for firmware ready value

On Thu, Dec 7, 2023 at 8:50 AM Shinas Rasheed <srasheed@...vell.com> wrote:
>
> The firmware ready value is 1, and get firmware ready status
> function should explicitly test for that value. The firmware
> ready value read will be 2 after driver load, and on unbind
> till firmware rewrites the firmware ready back to 0, the value
> seen by driver will be 2, which should be regarded as not ready.
>
> Fixes: 10c073e40469 ("octeon_ep: defer probe if firmware not ready")
> Signed-off-by: Shinas Rasheed <srasheed@...vell.com>
> ---
> V2:
>   - Fixed redundant logic
>
> V1: https://lore.kernel.org/all/20231206063549.2590305-1-srasheed@marvell.com/
>
>  drivers/net/ethernet/marvell/octeon_ep/octep_main.c | 3 ++-
>  1 file changed, 2 insertions(+), 1 deletion(-)
>
> diff --git a/drivers/net/ethernet/marvell/octeon_ep/octep_main.c b/drivers/net/ethernet/marvell/octeon_ep/octep_main.c
> index 552970c7dec0..b8ae269f6f97 100644
> --- a/drivers/net/ethernet/marvell/octeon_ep/octep_main.c
> +++ b/drivers/net/ethernet/marvell/octeon_ep/octep_main.c
> @@ -1258,7 +1258,8 @@ static bool get_fw_ready_status(struct pci_dev *pdev)
>
>                 pci_read_config_byte(pdev, (pos + 8), &status);
>                 dev_info(&pdev->dev, "Firmware ready status = %u\n", status);
> -               return status;
> +#define FW_STATUS_READY 1ULL
> +               return (status == FW_STATUS_READY);

The parentheses are not necessary, but if you find it better readable
this way, so be it.

Reviewed-by: Michal Schmidt <mschmidt@...hat.com>

>         }
>         return false;
>  }
> --
> 2.25.1
>