linux-kernel - Re: [PATCH] iwlegacy: Add missing check in il4965_commit

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Date:   Mon, 1 Mar 2021 08:25:47 +0100
From:   Stanislaw Gruszka <stf_xl@...pl>
To:     Dinghao Liu <dinghao.liu@....edu.cn>
Cc:     kjlu@....edu, Kalle Valo <kvalo@...eaurora.org>,
        "David S. Miller" <davem@...emloft.net>,
        Jakub Kicinski <kuba@...nel.org>,
        linux-wireless@...r.kernel.org, netdev@...r.kernel.org,
        linux-kernel@...r.kernel.org
Subject: Re: [PATCH] iwlegacy: Add missing check in il4965_commit_rxon

On Sun, Feb 28, 2021 at 08:25:22PM +0800, Dinghao Liu wrote:
> There is one il_set_tx_power() call in this function without
> return value check. Print error message and return error code
> on failure just like the other il_set_tx_power() call.

We have few calls for il_set_tx_power(), on some cases we
check return on some not. That correct as setting tx power
can be deferred internally if not possible at the moment.

> Signed-off-by: Dinghao Liu <dinghao.liu@....edu.cn>
> ---
>  drivers/net/wireless/intel/iwlegacy/4965.c | 6 +++++-
>  1 file changed, 5 insertions(+), 1 deletion(-)
> 
> diff --git a/drivers/net/wireless/intel/iwlegacy/4965.c b/drivers/net/wireless/intel/iwlegacy/4965.c
> index 9fa556486511..3235b8be1894 100644
> --- a/drivers/net/wireless/intel/iwlegacy/4965.c
> +++ b/drivers/net/wireless/intel/iwlegacy/4965.c
> @@ -1361,7 +1361,11 @@ il4965_commit_rxon(struct il_priv *il)
>  		 * We do not commit tx power settings while channel changing,
>  		 * do it now if tx power changed.
>  		 */
> -		il_set_tx_power(il, il->tx_power_next, false);
> +		ret = il_set_tx_power(il, il->tx_power_next, false);
> +		if (ret) {
> +			IL_ERR("Error sending TX power (%d)\n", ret);
> +			return ret;
> +		

This is not good change. We do not check return value of
il_commit_rxon(), except when creating interface. So this change might
broke creating interface, what worked otherwise when il_set_tx_power()
returned error.

Stanislaw