[nbd168-wireless:mt76 10/28] drivers/net/wireless/mediatek/mt76/mt7915/mac.c:472:5: warning: variable 'flags' set but not used
From: kernel test robot
Date: Wed Dec 22 2021 - 19:47:13 EST
tree: https://github.com/nbd168/wireless mt76
head: 05f0500c7b0147353e97de7369d504c5fbd3951e
commit: 0aa6b534b5e1cfe82e676d1d8f90bcea584565d3 [10/28] mt76: mt7915: update rx rate reporting for mt7916
config: mips-randconfig-r033-20211222 (https://download.01.org/0day-ci/archive/20211223/202112230801.vyMZPnaw-lkp@xxxxxxxxx/config)
compiler: clang version 14.0.0 (https://github.com/llvm/llvm-project de4e0195ae1c39f1c3b07834b8e32c113f4f20eb)
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
# install mips cross compiling tool for clang build
# apt-get install binutils-mips-linux-gnu
# https://github.com/nbd168/wireless/commit/0aa6b534b5e1cfe82e676d1d8f90bcea584565d3
git remote add nbd168-wireless https://github.com/nbd168/wireless
git fetch --no-tags nbd168-wireless mt76
git checkout 0aa6b534b5e1cfe82e676d1d8f90bcea584565d3
# 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=mips SHELL=/bin/bash drivers/net/wireless/mediatek/mt76/mt7915/
If you fix the issue, kindly add following tag as appropriate
Reported-by: kernel test robot <lkp@xxxxxxxxx>
All warnings (new ones prefixed by >>):
>> drivers/net/wireless/mediatek/mt76/mt7915/mac.c:472:5: warning: variable 'flags' set but not used [-Wunused-but-set-variable]
u8 flags, stbc, gi, bw, dcm, mode, nss;
^
>> drivers/net/wireless/mediatek/mt76/mt7915/mac.c:535:3: warning: variable 'flags' is uninitialized when used here [-Wuninitialized]
flags |= RATE_INFO_FLAGS_HE_MCS;
^~~~~
drivers/net/wireless/mediatek/mt76/mt7915/mac.c:472:10: note: initialize the variable 'flags' to silence this warning
u8 flags, stbc, gi, bw, dcm, mode, nss;
^
= '\0'
2 warnings generated.
vim +/flags +472 drivers/net/wireless/mediatek/mt76/mt7915/mac.c
464
465 static int
466 mt7915_mac_fill_rx_rate(struct mt7915_dev *dev,
467 struct mt76_rx_status *status,
468 struct ieee80211_supported_band *sband,
469 __le32 *rxv)
470 {
471 u32 v0, v2;
> 472 u8 flags, stbc, gi, bw, dcm, mode, nss;
473 int i, idx;
474 bool cck = false;
475
476 v0 = le32_to_cpu(rxv[0]);
477 v2 = le32_to_cpu(rxv[2]);
478
479 idx = i = FIELD_GET(MT_PRXV_TX_RATE, v0);
480 nss = FIELD_GET(MT_PRXV_NSTS, v0) + 1;
481
482 if (!is_mt7915(&dev->mt76)) {
483 stbc = FIELD_GET(MT_PRXV_HT_STBC, v0);
484 gi = FIELD_GET(MT_PRXV_HT_SHORT_GI, v0);
485 mode = FIELD_GET(MT_PRXV_TX_MODE, v0);
486 dcm = FIELD_GET(MT_PRXV_DCM, v0);
487 bw = FIELD_GET(MT_PRXV_FRAME_MODE, v0);
488 } else {
489 stbc = FIELD_GET(MT_CRXV_HT_STBC, v2);
490 gi = FIELD_GET(MT_CRXV_HT_SHORT_GI, v2);
491 mode = FIELD_GET(MT_CRXV_TX_MODE, v2);
492 dcm = !!(idx & GENMASK(3, 0) & MT_PRXV_TX_DCM);
493 bw = FIELD_GET(MT_CRXV_FRAME_MODE, v2);
494 }
495
496 switch (mode) {
497 case MT_PHY_TYPE_CCK:
498 cck = true;
499 fallthrough;
500 case MT_PHY_TYPE_OFDM:
501 i = mt76_get_rate(&dev->mt76, sband, i, cck);
502 break;
503 case MT_PHY_TYPE_HT_GF:
504 case MT_PHY_TYPE_HT:
505 status->encoding = RX_ENC_HT;
506 if (i > 31)
507 return -EINVAL;
508
509 flags = RATE_INFO_FLAGS_MCS;
510 if (gi)
511 flags |= RATE_INFO_FLAGS_SHORT_GI;
512 break;
513 case MT_PHY_TYPE_VHT:
514 status->nss = nss;
515 status->encoding = RX_ENC_VHT;
516 if (i > 9)
517 return -EINVAL;
518
519 flags = RATE_INFO_FLAGS_VHT_MCS;
520 if (gi)
521 flags |= RATE_INFO_FLAGS_SHORT_GI;
522 break;
523 case MT_PHY_TYPE_HE_MU:
524 case MT_PHY_TYPE_HE_SU:
525 case MT_PHY_TYPE_HE_EXT_SU:
526 case MT_PHY_TYPE_HE_TB:
527 status->nss = nss;
528 status->encoding = RX_ENC_HE;
529 i &= GENMASK(3, 0);
530
531 if (gi <= NL80211_RATE_INFO_HE_GI_3_2)
532 status->he_gi = gi;
533
534 status->he_dcm = dcm;
> 535 flags |= RATE_INFO_FLAGS_HE_MCS;
536 break;
537 default:
538 return -EINVAL;
539 }
540 status->rate_idx = i;
541
542 switch (bw) {
543 case IEEE80211_STA_RX_BW_20:
544 break;
545 case IEEE80211_STA_RX_BW_40:
546 if (mode & MT_PHY_TYPE_HE_EXT_SU &&
547 (idx & MT_PRXV_TX_ER_SU_106T)) {
548 status->bw = RATE_INFO_BW_HE_RU;
549 status->he_ru =
550 NL80211_RATE_INFO_HE_RU_ALLOC_106;
551 } else {
552 status->bw = RATE_INFO_BW_40;
553 }
554 break;
555 case IEEE80211_STA_RX_BW_80:
556 status->bw = RATE_INFO_BW_80;
557 break;
558 case IEEE80211_STA_RX_BW_160:
559 status->bw = RATE_INFO_BW_160;
560 break;
561 default:
562 return -EINVAL;
563 }
564
565 status->enc_flags |= RX_ENC_FLAG_STBC_MASK * stbc;
566 if (mode < MT_PHY_TYPE_HE_SU && gi)
567 status->enc_flags |= RX_ENC_FLAG_SHORT_GI;
568
569 return 0;
570 }
571
---
0-DAY CI Kernel Test Service, Intel Corporation
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