tree: https://github.com/nbd168/wireless mtk-flow-offload head: 6dbc6b1e07e9f4face597784cf4069cff9f3a043 commit: 6dbc6b1e07e9f4face597784cf4069cff9f3a043 [9/9] mt76: mt7915: add Wireless Ethernet Dispatch support config: x86_64-randconfig-a005-20220214 (https://download.01.org/0day-ci/archive/20220215/202202150257.O7iGQocg-lk...) compiler: clang version 15.0.0 (https://github.com/llvm/llvm-project ea071884b0cc7210b3cc5fe858f0e892a779a23b) reproduce (this is a W=1 build): wget https://raw.githubusercontent.com/intel/lkp-tests/master/sbin/make.cross -O ~/bin/make.cross chmod +x ~/bin/make.cross # https://github.com/nbd168/wireless/commit/6dbc6b1e07e9f4face597784cf4069c... git remote add nbd168-wireless https://github.com/nbd168/wireless git fetch --no-tags nbd168-wireless mtk-flow-offload git checkout 6dbc6b1e07e9f4face597784cf4069cff9f3a043 # save the config file to linux build tree mkdir build_dir COMPILER_INSTALL_PATH=$HOME/0day COMPILER=clang make.cross W=1 O=build_dir ARCH=x86_64 SHELL=/bin/bash drivers/net/wireless/mediatek/mt76/ If you fix the issue, kindly add following tag as appropriate Reported-by: kernel test robot <lkp(a)intel.com&gt; All warnings (new ones prefixed by >>): int ret, type, ring; ^ case MT76_WED_Q_TXFREE: ^~~~~~~~~~~~~~~~~ drivers/net/wireless/mediatek/mt76/dma.c:182:9: note: uninitialized use occurs here return ret; ^~~ drivers/net/wireless/mediatek/mt76/dma.c:158:7: warning: variable 'ret' is used uninitialized whenever switch case is taken [-Wsometimes-uninitialized] case MT76_WED_Q_TX: ^~~~~~~~~~~~~ drivers/net/wireless/mediatek/mt76/dma.c:182:9: note: uninitialized use occurs here return ret; ^~~ drivers/net/wireless/mediatek/mt76/dma.c:145:9: note: initialize the variable 'ret' to silence this warning int ret, type, ring; ^ = 0 3 warnings generated. vim +/ring +145 drivers/net/wireless/mediatek/mt76/dma.c 140 141 static int 142 mt76_dma_wed_setup(struct mt76_dev *dev, struct mt76_queue *q) 143 { 144 struct mtk_wed_device *wed = &dev->mmio.wed; 146 u8 flags = q->flags; 147 148 if (!mtk_wed_device_active(wed)) 149 q->flags &= ~MT_QFLAG_WED; 150 151 if (!(q->flags & MT_QFLAG_WED)) 152 return 0; 153 154 type = FIELD_GET(MT_QFLAG_WED_TYPE, q->flags); 155 ring = FIELD_GET(MT_QFLAG_WED_RING, q->flags); 156 157 switch (type) { 158 case MT76_WED_Q_TX: 159 #ifdef CONFIG_NET_MEDIATEK_SOC_WED 160 ret = mtk_wed_device_tx_ring_setup(wed, ring, q->regs); 161 if (!ret) 162 q->wed_regs = wed->tx_ring[ring].reg_base; 163 #endif 164 break; 166 /* WED txfree queue needs ring to be initialized before setup */ 167 q->flags = 0; 168 mt76_dma_queue_reset(dev, q); 169 mt76_dma_rx_fill(dev, q); 170 q->flags = flags; 171 --- 0-DAY CI Kernel Test Service, Intel Corporation https://lists.01.org/hyperkitty/list/kbuild-all@lists.01.org