drivers/net/wireless/ath/ath11k/dp_tx.c:511 ath11k_dp_tx_update_txcompl() error: uninitialized symbol 'rate_idx'.

From: Dan Carpenter
Date: Fri Jan 28 2022 - 02:13:08 EST

tree: https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git master
head: 0280e3c58f92b2fe0e8fbbdf8d386449168de4a8
commit: 1b8bb94c0612cf32e418e90ae93cf37214d84669 ath11k: report tx bitrate for iw wlan station dump
config: microblaze-randconfig-m031-20220127 (https://download.01.org/0day-ci/archive/20220127/202201272110.Z8STyrTC-lkp@xxxxxxxxx/config)
compiler: microblaze-linux-gcc (GCC) 11.2.0

If you fix the issue, kindly add following tag as appropriate
Reported-by: kernel test robot <lkp@xxxxxxxxx>
Reported-by: Dan Carpenter <dan.carpenter@xxxxxxxxxx>

smatch warnings:
drivers/net/wireless/ath/ath11k/dp_tx.c:511 ath11k_dp_tx_update_txcompl() error: uninitialized symbol 'rate_idx'.

vim +/rate_idx +511 drivers/net/wireless/ath/ath11k/dp_tx.c

1b8bb94c0612cf Wen Gong 2021-12-20 418 void ath11k_dp_tx_update_txcompl(struct ath11k *ar, struct hal_tx_status *ts)
1b8bb94c0612cf Wen Gong 2021-12-20 419 {
1b8bb94c0612cf Wen Gong 2021-12-20 420 struct ath11k_base *ab = ar->ab;
1b8bb94c0612cf Wen Gong 2021-12-20 421 struct ath11k_per_peer_tx_stats *peer_stats = &ar->cached_stats;
1b8bb94c0612cf Wen Gong 2021-12-20 422 enum hal_tx_rate_stats_pkt_type pkt_type;
1b8bb94c0612cf Wen Gong 2021-12-20 423 enum hal_tx_rate_stats_sgi sgi;
1b8bb94c0612cf Wen Gong 2021-12-20 424 enum hal_tx_rate_stats_bw bw;
1b8bb94c0612cf Wen Gong 2021-12-20 425 struct ath11k_peer *peer;
1b8bb94c0612cf Wen Gong 2021-12-20 426 struct ath11k_sta *arsta;
1b8bb94c0612cf Wen Gong 2021-12-20 427 struct ieee80211_sta *sta;
1b8bb94c0612cf Wen Gong 2021-12-20 428 u16 rate, ru_tones;
1b8bb94c0612cf Wen Gong 2021-12-20 429 u8 mcs, rate_idx, ofdma;
1b8bb94c0612cf Wen Gong 2021-12-20 430 int ret;
1b8bb94c0612cf Wen Gong 2021-12-20 431
1b8bb94c0612cf Wen Gong 2021-12-20 432 spin_lock_bh(&ab->base_lock);
1b8bb94c0612cf Wen Gong 2021-12-20 433 peer = ath11k_peer_find_by_id(ab, ts->peer_id);
1b8bb94c0612cf Wen Gong 2021-12-20 434 if (!peer || !peer->sta) {
1b8bb94c0612cf Wen Gong 2021-12-20 435 ath11k_dbg(ab, ATH11K_DBG_DP_TX,
1b8bb94c0612cf Wen Gong 2021-12-20 436 "failed to find the peer by id %u\n", ts->peer_id);
1b8bb94c0612cf Wen Gong 2021-12-20 437 goto err_out;
1b8bb94c0612cf Wen Gong 2021-12-20 438 }
1b8bb94c0612cf Wen Gong 2021-12-20 439
1b8bb94c0612cf Wen Gong 2021-12-20 440 sta = peer->sta;
1b8bb94c0612cf Wen Gong 2021-12-20 441 arsta = (struct ath11k_sta *)sta->drv_priv;
1b8bb94c0612cf Wen Gong 2021-12-20 442
1b8bb94c0612cf Wen Gong 2021-12-20 443 memset(&arsta->txrate, 0, sizeof(arsta->txrate));
1b8bb94c0612cf Wen Gong 2021-12-20 444 pkt_type = FIELD_GET(HAL_TX_RATE_STATS_INFO0_PKT_TYPE,
1b8bb94c0612cf Wen Gong 2021-12-20 445 ts->rate_stats);
1b8bb94c0612cf Wen Gong 2021-12-20 446 mcs = FIELD_GET(HAL_TX_RATE_STATS_INFO0_MCS,
1b8bb94c0612cf Wen Gong 2021-12-20 447 ts->rate_stats);
1b8bb94c0612cf Wen Gong 2021-12-20 448 sgi = FIELD_GET(HAL_TX_RATE_STATS_INFO0_SGI,
1b8bb94c0612cf Wen Gong 2021-12-20 449 ts->rate_stats);
1b8bb94c0612cf Wen Gong 2021-12-20 450 bw = FIELD_GET(HAL_TX_RATE_STATS_INFO0_BW, ts->rate_stats);
1b8bb94c0612cf Wen Gong 2021-12-20 451 ru_tones = FIELD_GET(HAL_TX_RATE_STATS_INFO0_TONES_IN_RU, ts->rate_stats);
1b8bb94c0612cf Wen Gong 2021-12-20 452 ofdma = FIELD_GET(HAL_TX_RATE_STATS_INFO0_OFDMA_TX, ts->rate_stats);
1b8bb94c0612cf Wen Gong 2021-12-20 453
1b8bb94c0612cf Wen Gong 2021-12-20 454 /* This is to prefer choose the real NSS value arsta->last_txrate.nss,
1b8bb94c0612cf Wen Gong 2021-12-20 455 * if it is invalid, then choose the NSS value while assoc.
1b8bb94c0612cf Wen Gong 2021-12-20 456 */
1b8bb94c0612cf Wen Gong 2021-12-20 457 if (arsta->last_txrate.nss)
1b8bb94c0612cf Wen Gong 2021-12-20 458 arsta->txrate.nss = arsta->last_txrate.nss;
1b8bb94c0612cf Wen Gong 2021-12-20 459 else
1b8bb94c0612cf Wen Gong 2021-12-20 460 arsta->txrate.nss = arsta->peer_nss;
1b8bb94c0612cf Wen Gong 2021-12-20 461
1b8bb94c0612cf Wen Gong 2021-12-20 462 if (pkt_type == HAL_TX_RATE_STATS_PKT_TYPE_11A ||
1b8bb94c0612cf Wen Gong 2021-12-20 463 pkt_type == HAL_TX_RATE_STATS_PKT_TYPE_11B) {
1b8bb94c0612cf Wen Gong 2021-12-20 464 ret = ath11k_mac_hw_ratecode_to_legacy_rate(mcs,
1b8bb94c0612cf Wen Gong 2021-12-20 465 pkt_type,
1b8bb94c0612cf Wen Gong 2021-12-20 466 &rate_idx,
1b8bb94c0612cf Wen Gong 2021-12-20 467 &rate);
1b8bb94c0612cf Wen Gong 2021-12-20 468 if (ret < 0)
1b8bb94c0612cf Wen Gong 2021-12-20 469 goto err_out;
1b8bb94c0612cf Wen Gong 2021-12-20 470 arsta->txrate.legacy = rate;

"rate_idx" only set on this path

1b8bb94c0612cf Wen Gong 2021-12-20 471 } else if (pkt_type == HAL_TX_RATE_STATS_PKT_TYPE_11N) {
1b8bb94c0612cf Wen Gong 2021-12-20 472 if (mcs > 7) {
1b8bb94c0612cf Wen Gong 2021-12-20 473 ath11k_warn(ab, "Invalid HT mcs index %d\n", mcs);
1b8bb94c0612cf Wen Gong 2021-12-20 474 goto err_out;
1b8bb94c0612cf Wen Gong 2021-12-20 475 }
1b8bb94c0612cf Wen Gong 2021-12-20 476
1b8bb94c0612cf Wen Gong 2021-12-20 477 if (arsta->txrate.nss != 0)
1b8bb94c0612cf Wen Gong 2021-12-20 478 arsta->txrate.mcs = mcs + 8 * (arsta->txrate.nss - 1);
1b8bb94c0612cf Wen Gong 2021-12-20 479 arsta->txrate.flags = RATE_INFO_FLAGS_MCS;
1b8bb94c0612cf Wen Gong 2021-12-20 480 if (sgi)
1b8bb94c0612cf Wen Gong 2021-12-20 481 arsta->txrate.flags |= RATE_INFO_FLAGS_SHORT_GI;
1b8bb94c0612cf Wen Gong 2021-12-20 482 } else if (pkt_type == HAL_TX_RATE_STATS_PKT_TYPE_11AC) {
1b8bb94c0612cf Wen Gong 2021-12-20 483 if (mcs > 9) {
1b8bb94c0612cf Wen Gong 2021-12-20 484 ath11k_warn(ab, "Invalid VHT mcs index %d\n", mcs);
1b8bb94c0612cf Wen Gong 2021-12-20 485 goto err_out;
1b8bb94c0612cf Wen Gong 2021-12-20 486 }
1b8bb94c0612cf Wen Gong 2021-12-20 487
1b8bb94c0612cf Wen Gong 2021-12-20 488 arsta->txrate.mcs = mcs;
1b8bb94c0612cf Wen Gong 2021-12-20 489 arsta->txrate.flags = RATE_INFO_FLAGS_VHT_MCS;
1b8bb94c0612cf Wen Gong 2021-12-20 490 if (sgi)
1b8bb94c0612cf Wen Gong 2021-12-20 491 arsta->txrate.flags |= RATE_INFO_FLAGS_SHORT_GI;
1b8bb94c0612cf Wen Gong 2021-12-20 492 } else if (pkt_type == HAL_TX_RATE_STATS_PKT_TYPE_11AX) {
1b8bb94c0612cf Wen Gong 2021-12-20 493 if (mcs > 11) {
1b8bb94c0612cf Wen Gong 2021-12-20 494 ath11k_warn(ab, "Invalid HE mcs index %d\n", mcs);
1b8bb94c0612cf Wen Gong 2021-12-20 495 goto err_out;
1b8bb94c0612cf Wen Gong 2021-12-20 496 }
1b8bb94c0612cf Wen Gong 2021-12-20 497
1b8bb94c0612cf Wen Gong 2021-12-20 498 arsta->txrate.mcs = mcs;
1b8bb94c0612cf Wen Gong 2021-12-20 499 arsta->txrate.flags = RATE_INFO_FLAGS_HE_MCS;
1b8bb94c0612cf Wen Gong 2021-12-20 500 arsta->txrate.he_gi = ath11k_mac_he_gi_to_nl80211_he_gi(sgi);
1b8bb94c0612cf Wen Gong 2021-12-20 501 }
1b8bb94c0612cf Wen Gong 2021-12-20 502
1b8bb94c0612cf Wen Gong 2021-12-20 503 arsta->txrate.bw = ath11k_mac_bw_to_mac80211_bw(bw);
1b8bb94c0612cf Wen Gong 2021-12-20 504 if (ofdma && pkt_type == HAL_TX_RATE_STATS_PKT_TYPE_11AX) {
1b8bb94c0612cf Wen Gong 2021-12-20 505 arsta->txrate.bw = RATE_INFO_BW_HE_RU;
1b8bb94c0612cf Wen Gong 2021-12-20 506 arsta->txrate.he_ru_alloc =
1b8bb94c0612cf Wen Gong 2021-12-20 507 ath11k_mac_he_ru_tones_to_nl80211_he_ru_alloc(ru_tones);
1b8bb94c0612cf Wen Gong 2021-12-20 508 }
1b8bb94c0612cf Wen Gong 2021-12-20 509
1b8bb94c0612cf Wen Gong 2021-12-20 510 if (ath11k_debugfs_is_extd_tx_stats_enabled(ar))
1b8bb94c0612cf Wen Gong 2021-12-20 @511 ath11k_debugfs_sta_add_tx_stats(arsta, peer_stats, rate_idx);
^^^^^^^^
Used here

1b8bb94c0612cf Wen Gong 2021-12-20 512
1b8bb94c0612cf Wen Gong 2021-12-20 513 err_out:
1b8bb94c0612cf Wen Gong 2021-12-20 514 spin_unlock_bh(&ab->base_lock);
1b8bb94c0612cf Wen Gong 2021-12-20 515 }

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