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

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Date:   Mon, 1 Mar 2021 15:41:24 +0800 (GMT+08:00)
From:   dinghao.liu@....edu.cn
To:     "Stanislaw Gruszka" <stf_xl@...pl>
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: 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.
> 

It's clear to me, Thanks for your explanation!

Regards,
Dinghao