linux-kernel - Re: [PATCH] iavf: remove redundant null check on key

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Date:   Sat, 3 Jul 2021 12:49:18 +0300
From:   Dan Carpenter <dan.carpenter@...cle.com>
To:     kernel test robot <lkp@...el.com>
Cc:     Colin King <colin.king@...onical.com>,
        Jesse Brandeburg <jesse.brandeburg@...el.com>,
        Tony Nguyen <anthony.l.nguyen@...el.com>,
        Jakub Kicinski <kuba@...nel.org>,
        intel-wired-lan@...ts.osuosl.org, netdev@...r.kernel.org,
        kbuild-all@...ts.01.org, kernel-janitors@...r.kernel.org,
        linux-kernel@...r.kernel.org
Subject: Re: [PATCH] iavf: remove redundant null check on key

On Sat, Jul 03, 2021 at 02:43:46AM +0800, kernel test robot wrote:
> 129cf89e585676 drivers/net/ethernet/intel/iavf/i40evf_ethtool.c   Jesse Brandeburg 2018-09-14  1899  static int iavf_set_rxfh(struct net_device *netdev, const u32 *indir,
> 892311f66f2411 drivers/net/ethernet/intel/i40evf/i40evf_ethtool.c Eyal Perry       2014-12-02  1900  			 const u8 *key, const u8 hfunc)
> 4e9dc31f696ae8 drivers/net/ethernet/intel/i40evf/i40evf_ethtool.c Mitch A Williams 2014-04-01  1901  {
> 129cf89e585676 drivers/net/ethernet/intel/iavf/i40evf_ethtool.c   Jesse Brandeburg 2018-09-14  1902  	struct iavf_adapter *adapter = netdev_priv(netdev);
> 2c86ac3c70794f drivers/net/ethernet/intel/i40evf/i40evf_ethtool.c Helin Zhang      2015-10-27  1903  	u16 i;
> 4e9dc31f696ae8 drivers/net/ethernet/intel/i40evf/i40evf_ethtool.c Mitch A Williams 2014-04-01  1904  
> 892311f66f2411 drivers/net/ethernet/intel/i40evf/i40evf_ethtool.c Eyal Perry       2014-12-02  1905  	/* We do not allow change in unsupported parameters */
> 892311f66f2411 drivers/net/ethernet/intel/i40evf/i40evf_ethtool.c Eyal Perry       2014-12-02  1906  	if (key ||
> 892311f66f2411 drivers/net/ethernet/intel/i40evf/i40evf_ethtool.c Eyal Perry       2014-12-02  1907  	    (hfunc != ETH_RSS_HASH_NO_CHANGE && hfunc != ETH_RSS_HASH_TOP))
> 892311f66f2411 drivers/net/ethernet/intel/i40evf/i40evf_ethtool.c Eyal Perry       2014-12-02  1908  		return -EOPNOTSUPP;
> 892311f66f2411 drivers/net/ethernet/intel/i40evf/i40evf_ethtool.c Eyal Perry       2014-12-02  1909  	if (!indir)
> 892311f66f2411 drivers/net/ethernet/intel/i40evf/i40evf_ethtool.c Eyal Perry       2014-12-02  1910  		return 0;
> 892311f66f2411 drivers/net/ethernet/intel/i40evf/i40evf_ethtool.c Eyal Perry       2014-12-02  1911  
> 43a3d9ba34c9ca drivers/net/ethernet/intel/i40evf/i40evf_ethtool.c Mitch Williams   2016-04-12 @1912  	memcpy(adapter->rss_key, key, adapter->rss_key_size);

Heh...  There have been a bunch of patches modifying the behavior if
"key" is non-NULL and no one noticed that it's actually impossible.

:P

regards,
dan carpenter