netdev - Re: [PATCH V3 net-next 2/4] ethtool: extend coalesce setting uAPI with CQE mode

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Date:   Tue, 14 Sep 2021 10:47:41 -0700
From:   Jakub Kicinski <kuba@...nel.org>
To:     Julian Wiedmann <jwi@...ux.ibm.com>
Cc:     Yufeng Mo <moyufeng@...wei.com>, davem@...emloft.net,
        netdev@...r.kernel.org, shenjian15@...wei.com,
        lipeng321@...wei.com, yisen.zhuang@...wei.com,
        linyunsheng@...wei.com, huangguangbin2@...wei.com,
        chenhao288@...ilicon.com, salil.mehta@...wei.com,
        linuxarm@...wei.com, linuxarm@...neuler.org, dledford@...hat.com,
        jgg@...pe.ca, netanel@...zon.com, akiyano@...zon.com,
        thomas.lendacky@....com, irusskikh@...vell.com,
        michael.chan@...adcom.com, edwin.peer@...adcom.com,
        rohitm@...lsio.com, jacob.e.keller@...el.com,
        ioana.ciornei@....com, vladimir.oltean@....com,
        sgoutham@...vell.com, sbhatta@...vell.com, saeedm@...dia.com,
        ecree.xilinx@...il.com, grygorii.strashko@...com,
        merez@...eaurora.org, kvalo@...eaurora.org,
        linux-wireless@...r.kernel.org
Subject: Re: [PATCH V3 net-next 2/4] ethtool: extend coalesce setting uAPI
 with CQE mode

On Tue, 14 Sep 2021 20:31:29 +0300 Julian Wiedmann wrote:
> > -	if (!dev->ethtool_ops->set_coalesce)
> > +	if (!dev->ethtool_ops->set_coalesce && !dev->ethtool_ops->get_coalesce)
> >  		return -EOPNOTSUPP;
> >    
> 
> This needs to be
> 
> 	if (!set_coalesce || !get_coalesce)
> 		return -EOPNOTSUPP;
> 
> Otherwise you end up calling a NULL pointer below if just _one_ of the
> callbacks is available.

Good catch, care to send a fix?