Re: [PATCH v3 14/14] greybus: cpc: add CPC SDIO host driver

[kernel test robot <lkp@intel.com>]

Hi Damien,

kernel test robot noticed the following build warnings:

[auto build test WARNING on linus/master]
[also build test WARNING on v6.19 next-20260212]
[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/Damien-Ri-gel/greybus-cpc-add-minimal-CPC-Host-Device-infrastructure/20260212-232259
base:   linus/master
patch link:    https://lore.kernel.org/r/20260212144352.93043-15-damien.riegel%40silabs.com
patch subject: [PATCH v3 14/14] greybus: cpc: add CPC SDIO host driver
config: nios2-allmodconfig (https://download.01.org/0day-ci/archive/20260213/202602130822.5syxoFy2-lkp@intel.com/config)
compiler: nios2-linux-gcc (GCC) 11.5.0
reproduce (this is a W=1 build): (https://download.01.org/0day-ci/archive/20260213/202602130822.5syxoFy2-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@intel.com>
| Closes: https://lore.kernel.org/oe-kbuild-all/202602130822.5syxoFy2-lkp@intel.com/

All warnings (new ones prefixed by >>):

   drivers/greybus/cpc/sdio.c: In function 'gb_cpc_sdio_tx':
>> drivers/greybus/cpc/sdio.c:286:13: warning: variable 'err' set but not used [-Wunused-but-set-variable]
     286 |         int err;
         |             ^~~


vim +/err +286 drivers/greybus/cpc/sdio.c

   279	
   280	static int gb_cpc_sdio_tx(struct cpc_sdio *ctx)
   281	{
   282		struct sk_buff_head frame_list;
   283		unsigned char *tx_buff;
   284		size_t tx_len;
   285		int pkt_sent;
 > 286		int err;
   287	
   288		skb_queue_head_init(&frame_list);
   289	
   290		cpc_hd_dequeue_many(ctx->cpc_hd, &frame_list, ctx->max_aggregation);
   291	
   292		if (skb_queue_empty(&frame_list))
   293			return 0;
   294	
   295		tx_len = cpc_sdio_build_aggregated_frame(ctx, &frame_list, &tx_buff);
   296		if (!tx_len) {
   297			dev_err(ctx->dev, "failed to build aggregated frame\n");
   298			goto cleanup_frames;
   299		}
   300	
   301		sdio_claim_host(ctx->func);
   302		err = sdio_writesb(ctx->func, GB_CPC_SDIO_ADDR_FIFO, tx_buff, tx_len);
   303		sdio_release_host(ctx->func);
   304	
   305		kfree(tx_buff);
   306	
   307	cleanup_frames:
   308		pkt_sent = skb_queue_len(&frame_list);
   309		skb_queue_purge(&frame_list);
   310	
   311		return pkt_sent;
   312	}
   313	

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