[PATCH v5 3/4] net: can: rockchip: add can for RK3576 Soc

[kernel test robot]

Hi Elaine,

kernel test robot noticed the following build warnings:

[auto build test WARNING on mkl-can-next/testing]
[also build test WARNING on robh/for-next linus/master v6.15-rc7 next-20250523]
[cannot apply to rockchip/for-next]
[If your patch is applied to the wrong git tree, kindly drop us a note.
And when submitting patch, we suggest to use '--base' as documented in
https://git-scm.com/docs/git-format-patch#_base_tree_information]

url:    https://github.com/intel-lab-lkp/linux/commits/Elaine-Zhang/dt-bindings-can-rockchip_canfd-add-rk3576-CAN-FD-controller/20250523-211340
base:   https://git.kernel.org/pub/scm/linux/kernel/git/mkl/linux-can-next.git testing
patch link:    https://lore.kernel.org/r/20250523075422.4010083-4-zhangqing%40rock-chips.com
patch subject: [PATCH v5 3/4] net: can: rockchip: add can for RK3576 Soc
config: loongarch-allyesconfig (https://download.01.org/0day-ci/archive/20250524/202505242132.Mau7vNde-lkp@intel.com/config)
compiler: loongarch64-linux-gcc (GCC) 14.2.0
reproduce (this is a W=1 build): (https://download.01.org/0day-ci/archive/20250524/202505242132.Mau7vNde-lkp@intel.com/reproduce)

If you fix the issue in a separate patch/commit (i.e. not just a new version of
the same patch/commit), kindly add following tags
| Reported-by: kernel test robot <lkp at intel.com>
| Closes: https://lore.kernel.org/oe-kbuild-all/202505242132.Mau7vNde-lkp@intel.com/

All warnings (new ones prefixed by >>):

   drivers/net/can/rockchip/rockchip_canfd-tx.c: In function 'rkcanfd_handle_rk3576_tx_int':
>> drivers/net/can/rockchip/rockchip_canfd-tx.c:173:25: warning: variable 'skb' set but not used [-Wunused-but-set-variable]
     173 |         struct sk_buff *skb;
         |                         ^~~
   In file included from drivers/net/can/rockchip/rockchip_canfd-tx.c:9:
   drivers/net/can/rockchip/rockchip_canfd.h: At top level:
   drivers/net/can/rockchip/rockchip_canfd.h:699:29: warning: 'priv' defined but not used [-Wunused-variable]
     699 | static struct rkcanfd_priv *priv;
         |                             ^~~~


vim +/skb +173 drivers/net/can/rockchip/rockchip_canfd-tx.c

   168	
   169	int rkcanfd_handle_rk3576_tx_int(struct rkcanfd_priv *priv)
   170	{
   171		struct net_device_stats *stats = &priv->ndev->stats;
   172		unsigned int tx_tail;
 > 173		struct sk_buff *skb;
   174		unsigned int frame_len = 0;
   175	
   176		tx_tail = rkcanfd_get_tx_tail(priv);
   177		skb = priv->can.echo_skb[tx_tail];
   178	
   179		/* Manual handling of CAN Bus Error counters. See
   180		 * rkcanfd_get_corrected_berr_counter() for detailed
   181		 * explanation.
   182		 */
   183		if (priv->bec.txerr)
   184			priv->bec.txerr--;
   185	
   186		stats->tx_bytes +=
   187			can_rx_offload_get_echo_skb_queue_tail(&priv->offload,
   188							       tx_tail, &frame_len);
   189		stats->tx_packets++;
   190		WRITE_ONCE(priv->tx_tail, priv->tx_tail + 1);
   191		netif_subqueue_completed_wake(priv->ndev, 0, 1, frame_len,
   192					      rkcanfd_get_effective_tx_free(priv),
   193					      RKCANFD_TX_START_THRESHOLD);
   194		return 0;
   195	}
   196	

-- 
0-DAY CI Kernel Test Service
https://github.com/intel/lkp-tests/wiki