[kbuild-all] [linux-next:master 556/6237] drivers/net/wireless/ath/wcn36xx/main.c:409:7: warning: Branch condition evaluates to a garbage value [clang-analyzer-core.uninitialized.Branch]

tree: https://git.kernel.org/pub/scm/linux/kernel/git/next/linux-next.git master head: 763a906a02e961eedabab7dbedd16904a3bd0184 commit: d6f2746691cb10e484f15ab9e44e2cc2ccf9bd86 [556/6237] wcn36xx: Track the band and channel we are tuned to config: x86_64-randconfig-c007 (https://download.01.org/0day-ci/archive/20220217/202202170554.WYrgcFtq-lk...) compiler: clang version 15.0.0 (https://github.com/llvm/llvm-project 0e628a783b935c70c80815db6c061ec84f884af5) 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://git.kernel.org/pub/scm/linux/kernel/git/next/linux-next.git/commi... git remote add linux-next https://git.kernel.org/pub/scm/linux/kernel/git/next/linux-next.git git fetch --no-tags linux-next master git checkout d6f2746691cb10e484f15ab9e44e2cc2ccf9bd86 # save the config file to linux build tree COMPILER_INSTALL_PATH=$HOME/0day COMPILER=clang make.cross ARCH=x86_64 clang-analyzer If you fix the issue, kindly add following tag as appropriate Reported-by: kernel test robot <yujie.liu(a)intel.com&gt; clang-analyzer warnings: (new ones prefixed by >>) if (channel) ^ drivers/net/wireless/ath/wcn36xx/main.c:396:2: note: 'channel' declared without an initial value struct ieee80211_channel *channel; ^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~ drivers/net/wireless/ath/wcn36xx/main.c:399:2: note: Loop condition is true. Entering loop body for (i = 0; i < ARRAY_SIZE(wcn->hw->wiphy->bands); i++) { ^ drivers/net/wireless/ath/wcn36xx/main.c:401:7: note: Assuming 'band' is non-null if (!band) ^~~~~ drivers/net/wireless/ath/wcn36xx/main.c:401:3: note: Taking false branch if (!band) ^ drivers/net/wireless/ath/wcn36xx/main.c:403:15: note: Assuming 'j' is >= field 'n_channels' for (j = 0; j < band->n_channels; j++) { ^~~~~~~~~~~~~~~~~~~~ drivers/net/wireless/ath/wcn36xx/main.c:403:3: note: Loop condition is false. Execution continues on line 409 for (j = 0; j < band->n_channels; j++) { ^ drivers/net/wireless/ath/wcn36xx/main.c:409:7: note: Branch condition evaluates to a garbage value if (channel) ^~~~~~~ drivers/net/wireless/ath/wcn36xx/main.c:413:6: warning: Branch condition evaluates to a garbage value [clang-analyzer-core.uninitialized.Branch] if (!channel) { ^ vim +409 drivers/net/wireless/ath/wcn36xx/main.c 5973a2947430a29 Loic Poulain 2020-08-24 390 5973a2947430a29 Loic Poulain 2020-08-24 391 static void wcn36xx_change_opchannel(struct wcn36xx *wcn, int ch) 5973a2947430a29 Loic Poulain 2020-08-24 392 { 5973a2947430a29 Loic Poulain 2020-08-24 393 struct ieee80211_vif *vif = NULL; 5973a2947430a29 Loic Poulain 2020-08-24 394 struct wcn36xx_vif *tmp; d6f2746691cb10e Bryan O'Donoghue 2022-01-15 395 struct ieee80211_supported_band *band; d6f2746691cb10e Bryan O'Donoghue 2022-01-15 396 struct ieee80211_channel *channel; d6f2746691cb10e Bryan O'Donoghue 2022-01-15 397 int i, j; d6f2746691cb10e Bryan O'Donoghue 2022-01-15 398 d6f2746691cb10e Bryan O'Donoghue 2022-01-15 399 for (i = 0; i < ARRAY_SIZE(wcn->hw->wiphy->bands); i++) { d6f2746691cb10e Bryan O'Donoghue 2022-01-15 400 band = wcn->hw->wiphy->bands[i]; d6f2746691cb10e Bryan O'Donoghue 2022-01-15 401 if (!band) d6f2746691cb10e Bryan O'Donoghue 2022-01-15 402 break; d6f2746691cb10e Bryan O'Donoghue 2022-01-15 403 for (j = 0; j < band->n_channels; j++) { d6f2746691cb10e Bryan O'Donoghue 2022-01-15 404 if (HW_VALUE_CHANNEL(band->channels[j].hw_value) == ch) { d6f2746691cb10e Bryan O'Donoghue 2022-01-15 405 channel = &band->channels[j]; d6f2746691cb10e Bryan O'Donoghue 2022-01-15 406 break; d6f2746691cb10e Bryan O'Donoghue 2022-01-15 407 } d6f2746691cb10e Bryan O'Donoghue 2022-01-15 408 } d6f2746691cb10e Bryan O'Donoghue 2022-01-15 @409 if (channel) d6f2746691cb10e Bryan O'Donoghue 2022-01-15 410 break; d6f2746691cb10e Bryan O'Donoghue 2022-01-15 411 } d6f2746691cb10e Bryan O'Donoghue 2022-01-15 412 d6f2746691cb10e Bryan O'Donoghue 2022-01-15 413 if (!channel) { d6f2746691cb10e Bryan O'Donoghue 2022-01-15 414 wcn36xx_err("Cannot tune to channel %d\n", ch); d6f2746691cb10e Bryan O'Donoghue 2022-01-15 415 return; d6f2746691cb10e Bryan O'Donoghue 2022-01-15 416 } d6f2746691cb10e Bryan O'Donoghue 2022-01-15 417 d6f2746691cb10e Bryan O'Donoghue 2022-01-15 418 wcn->band = band; d6f2746691cb10e Bryan O'Donoghue 2022-01-15 419 wcn->channel = channel; 5973a2947430a29 Loic Poulain 2020-08-24 420 5973a2947430a29 Loic Poulain 2020-08-24 421 list_for_each_entry(tmp, &wcn->vif_list, list) { 5973a2947430a29 Loic Poulain 2020-08-24 422 vif = wcn36xx_priv_to_vif(tmp); 5973a2947430a29 Loic Poulain 2020-08-24 423 wcn36xx_smd_switch_channel(wcn, vif, ch); 5973a2947430a29 Loic Poulain 2020-08-24 424 } d6f2746691cb10e Bryan O'Donoghue 2022-01-15 425 d6f2746691cb10e Bryan O'Donoghue 2022-01-15 426 return; 5973a2947430a29 Loic Poulain 2020-08-24 427 } 5973a2947430a29 Loic Poulain 2020-08-24 428 --- 0-DAY CI Kernel Test Service, Intel Corporation https://lists.01.org/hyperkitty/list/kbuild-all@lists.01.org