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WSL2-Linux-Kernel
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ath11k: add packet log support for QCA6390 

Add packet log support for QCA6390, otherwise the data connection will stall
within a minute or so.  Enable it via debugfs and use trace-cmd to capture the
pktlogs.

echo 0xffff 1 > /sys/kernel/debug/ath11k/qca6390\ hw2.0/mac0/pktlog_filter

The mon status ring doesn't support interrupt so far, so host starts
a timer to reap this ring. The timer handler also reaps the
rxdma_err_dst_ring in case of monitor mode.

As QCA6390 requires bss created ahead of starting vdev, so check
vdev_start_delay for monitor mode.

For QCA6390, it uses wbm_desc_rel_ring to return descriptors.
It also uses rx_refill_buf_ring to fill mon buffer instead of
rxdma_mon_buf_ring.

Tested-on: QCA6390 hw2.0 PCI WLAN.HST.1.0.1-01740-QCAHSTSWPLZ_V2_TO_X86-1

Signed-off-by: Carl Huang <cjhuang@codeaurora.org>
Signed-off-by: Kalle Valo <kvalo@codeaurora.org>
Link: https://lore.kernel.org/r/1601463073-12106-2-git-send-email-kvalo@codeaurora.org
This commit is contained in:
Carl Huang 2020-09-30 13:51:09 +03:00 коммит произвёл Kalle Valo
Родитель 87e8497a7d
Коммит 701e48a43e
9 изменённых файлов: 166 добавлений и 53 удалений
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3
drivers/net/wireless/ath/ath11k/core.h
Просмотреть файл

@ -37,6 +37,8 @@
extern unsigned int ath11k_frame_mode;
#define ATH11K_MON_TIMER_INTERVAL 10
enum ath11k_supported_bw {
ATH11K_BW_20 = 0,
ATH11K_BW_40 = 1,
@ -727,6 +729,7 @@ struct ath11k_base {
struct ath11k_dbring_cap *db_caps;
u32 num_db_cap;
struct timer_list mon_reap_timer;
/* must be last */
u8 drv_priv[0] __aligned(sizeof(void *));
};

2
drivers/net/wireless/ath/ath11k/dp.c
Просмотреть файл

@ -828,6 +828,8 @@ void ath11k_dp_pdev_free(struct ath11k_base *ab)
struct ath11k *ar;
int i;
del_timer_sync(&ab->mon_reap_timer);
for (i = 0; i < ab->num_radios; i++) {
ar = ab->pdevs[i].ar;
ath11k_dp_rx_pdev_free(ab, i);

3
drivers/net/wireless/ath/ath11k/dp.h
Просмотреть файл

@ -40,6 +40,7 @@ struct dp_rx_tid {
#define DP_REO_DESC_FREE_THRESHOLD 64
#define DP_REO_DESC_FREE_TIMEOUT_MS 1000
#define DP_MON_SERVICE_BUDGET 128
struct dp_reo_cache_flush_elem {
struct list_head list;
@ -497,7 +498,7 @@ struct htt_ppdu_stats_cfg_cmd {
} __packed;
#define HTT_PPDU_STATS_CFG_MSG_TYPE GENMASK(7, 0)
#define HTT_PPDU_STATS_CFG_PDEV_ID GENMASK(16, 9)
#define HTT_PPDU_STATS_CFG_PDEV_ID GENMASK(15, 8)
#define HTT_PPDU_STATS_CFG_TLV_TYPE_BITMASK GENMASK(31, 16)
enum htt_ppdu_stats_tag_type {

108
drivers/net/wireless/ath/ath11k/dp_rx.c
Просмотреть файл

@ -262,6 +262,18 @@ static u32 ath11k_dp_rxdesc_get_ppduid(struct hal_rx_desc *rx_desc)
return __le16_to_cpu(rx_desc->mpdu_start.phy_ppdu_id);
}
static void ath11k_dp_service_mon_ring(struct timer_list *t)
{
struct ath11k_base *ab = from_timer(ab, t, mon_reap_timer);
int i;
for (i = 0; i < ab->hw_params.num_rxmda_per_pdev; i++)
ath11k_dp_rx_process_mon_rings(ab, i, NULL, DP_MON_SERVICE_BUDGET);
mod_timer(&ab->mon_reap_timer, jiffies +
msecs_to_jiffies(ATH11K_MON_TIMER_INTERVAL));
}
/* Returns number of Rx buffers replenished */
int ath11k_dp_rxbufs_replenish(struct ath11k_base *ab, int mac_id,
struct dp_rxdma_ring *rx_ring,
@ -569,9 +581,14 @@ static int ath11k_dp_rx_pdev_srng_alloc(struct ath11k *ar)
/* if rxdma1_enable is false, then it doesn't need
* to setup rxdam_mon_buf_ring, rxdma_mon_dst_ring
* and rxdma_mon_desc_ring.
* init reap timer for QCA6390.
*/
if (!ar->ab->hw_params.rxdma1_enable)
if (!ar->ab->hw_params.rxdma1_enable) {
//init mon status buffer reap timer
timer_setup(&ar->ab->mon_reap_timer,
ath11k_dp_service_mon_ring, 0);
return 0;
}
ret = ath11k_dp_srng_setup(ar->ab,
&dp->rxdma_mon_buf_ring.refill_buf_ring,
@ -4289,8 +4306,13 @@ int ath11k_dp_rx_monitor_link_desc_return(struct ath11k *ar,
void *src_srng_desc;
int ret = 0;
dp_srng = &dp->rxdma_mon_desc_ring;
hal_srng = &ar->ab->hal.srng_list[dp_srng->ring_id];
if (ar->ab->hw_params.rxdma1_enable) {
dp_srng = &dp->rxdma_mon_desc_ring;
hal_srng = &ar->ab->hal.srng_list[dp_srng->ring_id];
} else {
dp_srng = &ar->ab->dp.wbm_desc_rel_ring;
hal_srng = &ar->ab->hal.srng_list[dp_srng->ring_id];
}
ath11k_hal_srng_access_begin(ar->ab, hal_srng);
@ -4314,16 +4336,16 @@ int ath11k_dp_rx_monitor_link_desc_return(struct ath11k *ar,
static
void ath11k_dp_rx_mon_next_link_desc_get(void *rx_msdu_link_desc,
dma_addr_t *paddr, u32 *sw_cookie,
u8 *rbm,
void **pp_buf_addr_info)
{
struct hal_rx_msdu_link *msdu_link =
(struct hal_rx_msdu_link *)rx_msdu_link_desc;
struct ath11k_buffer_addr *buf_addr_info;
u8 rbm = 0;
buf_addr_info = (struct ath11k_buffer_addr *)&msdu_link->buf_addr_info;
ath11k_hal_rx_buf_addr_info_get(buf_addr_info, paddr, sw_cookie, &rbm);
ath11k_hal_rx_buf_addr_info_get(buf_addr_info, paddr, sw_cookie, rbm);
*pp_buf_addr_info = (void *)buf_addr_info;
}
@ -4434,7 +4456,7 @@ static void ath11k_dp_mon_get_buf_len(struct hal_rx_msdu_desc_info *info,
}
static u32
ath11k_dp_rx_mon_mpdu_pop(struct ath11k *ar,
ath11k_dp_rx_mon_mpdu_pop(struct ath11k *ar, int mac_id,
void *ring_entry, struct sk_buff **head_msdu,
struct sk_buff **tail_msdu, u32 *npackets,
u32 *ppdu_id)
@ -4459,9 +4481,15 @@ ath11k_dp_rx_mon_mpdu_pop(struct ath11k *ar,
struct hal_reo_entrance_ring *ent_desc =
(struct hal_reo_entrance_ring *)ring_entry;
int buf_id;
u32 rx_link_buf_info[2];
u8 rbm;
if (!ar->ab->hw_params.rxdma1_enable)
rx_ring = &dp->rx_refill_buf_ring;
ath11k_hal_rx_reo_ent_buf_paddr_get(ring_entry, &paddr,
&sw_cookie, &p_last_buf_addr_info,
&sw_cookie,
&p_last_buf_addr_info, &rbm,
&msdu_cnt);
if (FIELD_GET(HAL_REO_ENTR_RING_INFO1_RXDMA_PUSH_REASON,
@ -4487,9 +4515,14 @@ ath11k_dp_rx_mon_mpdu_pop(struct ath11k *ar,
return rx_bufs_used;
}
rx_msdu_link_desc =
(void *)pmon->link_desc_banks[sw_cookie].vaddr +
(paddr - pmon->link_desc_banks[sw_cookie].paddr);
if (ar->ab->hw_params.rxdma1_enable)
rx_msdu_link_desc =
(void *)pmon->link_desc_banks[sw_cookie].vaddr +
(paddr - pmon->link_desc_banks[sw_cookie].paddr);
else
rx_msdu_link_desc =
(void *)ar->ab->dp.link_desc_banks[sw_cookie].vaddr +
(paddr - ar->ab->dp.link_desc_banks[sw_cookie].paddr);
ath11k_hal_rx_msdu_list_get(ar, rx_msdu_link_desc, &msdu_list,
&num_msdus);
@ -4585,15 +4618,22 @@ next_msdu:
spin_unlock_bh(&rx_ring->idr_lock);
}
ath11k_hal_rx_buf_addr_info_set(rx_link_buf_info, paddr, sw_cookie, rbm);
ath11k_dp_rx_mon_next_link_desc_get(rx_msdu_link_desc, &paddr,
&sw_cookie,
&sw_cookie, &rbm,
&p_buf_addr_info);
if (ath11k_dp_rx_monitor_link_desc_return(ar,
p_last_buf_addr_info,
dp->mac_id))
ath11k_dbg(ar->ab, ATH11K_DBG_DATA,
"dp_rx_monitor_link_desc_return failed");
if (ar->ab->hw_params.rxdma1_enable) {
if (ath11k_dp_rx_monitor_link_desc_return(ar,
p_last_buf_addr_info,
dp->mac_id))
ath11k_dbg(ar->ab, ATH11K_DBG_DATA,
"dp_rx_monitor_link_desc_return failed");
} else {
ath11k_dp_rx_link_desc_return(ar->ab, rx_link_buf_info,
HAL_WBM_REL_BM_ACT_PUT_IN_IDLE);
}
p_last_buf_addr_info = p_buf_addr_info;
@ -4777,8 +4817,8 @@ mon_deliver_fail:
return -EINVAL;
}
static void ath11k_dp_rx_mon_dest_process(struct ath11k *ar, u32 quota,
struct napi_struct *napi)
static void ath11k_dp_rx_mon_dest_process(struct ath11k *ar, int mac_id,
u32 quota, struct napi_struct *napi)
{
struct ath11k_pdev_dp *dp = &ar->dp;
struct ath11k_mon_data *pmon = (struct ath11k_mon_data *)&dp->mon_data;
@ -4786,10 +4826,16 @@ static void ath11k_dp_rx_mon_dest_process(struct ath11k *ar, u32 quota,
void *mon_dst_srng;
u32 ppdu_id;
u32 rx_bufs_used;
u32 ring_id;
struct ath11k_pdev_mon_stats *rx_mon_stats;
u32 npackets = 0;
mon_dst_srng = &ar->ab->hal.srng_list[dp->rxdma_mon_dst_ring.ring_id];
if (ar->ab->hw_params.rxdma1_enable)
ring_id = dp->rxdma_mon_dst_ring.ring_id;
else
ring_id = dp->rxdma_err_dst_ring[mac_id].ring_id;
mon_dst_srng = &ar->ab->hal.srng_list[ring_id];
if (!mon_dst_srng) {
ath11k_warn(ar->ab,
@ -4812,7 +4858,7 @@ static void ath11k_dp_rx_mon_dest_process(struct ath11k *ar, u32 quota,
head_msdu = NULL;
tail_msdu = NULL;
rx_bufs_used += ath11k_dp_rx_mon_mpdu_pop(ar, ring_entry,
rx_bufs_used += ath11k_dp_rx_mon_mpdu_pop(ar, mac_id, ring_entry,
&head_msdu,
&tail_msdu,
&npackets, &ppdu_id);
@ -4839,15 +4885,21 @@ static void ath11k_dp_rx_mon_dest_process(struct ath11k *ar, u32 quota,
if (rx_bufs_used) {
rx_mon_stats->dest_ppdu_done++;
ath11k_dp_rxbufs_replenish(ar->ab, dp->mac_id,
&dp->rxdma_mon_buf_ring,
rx_bufs_used,
HAL_RX_BUF_RBM_SW3_BM);
if (ar->ab->hw_params.rxdma1_enable)
ath11k_dp_rxbufs_replenish(ar->ab, dp->mac_id,
&dp->rxdma_mon_buf_ring,
rx_bufs_used,
HAL_RX_BUF_RBM_SW3_BM);
else
ath11k_dp_rxbufs_replenish(ar->ab, dp->mac_id,
&dp->rx_refill_buf_ring,
rx_bufs_used,
HAL_RX_BUF_RBM_SW3_BM);
}
}
static void ath11k_dp_rx_mon_status_process_tlv(struct ath11k *ar,
u32 quota,
int mac_id, u32 quota,
struct napi_struct *napi)
{
struct ath11k_pdev_dp *dp = &ar->dp;
@ -4871,7 +4923,7 @@ static void ath11k_dp_rx_mon_status_process_tlv(struct ath11k *ar,
if (tlv_status == HAL_TLV_STATUS_PPDU_DONE) {
rx_mon_stats->status_ppdu_done++;
pmon->mon_ppdu_status = DP_PPDU_STATUS_DONE;
ath11k_dp_rx_mon_dest_process(ar, quota, napi);
ath11k_dp_rx_mon_dest_process(ar, mac_id, quota, napi);
pmon->mon_ppdu_status = DP_PPDU_STATUS_START;
}
dev_kfree_skb_any(status_skb);
@ -4886,10 +4938,10 @@ static int ath11k_dp_mon_process_rx(struct ath11k_base *ab, int mac_id,
struct ath11k_mon_data *pmon = (struct ath11k_mon_data *)&dp->mon_data;
int num_buffs_reaped = 0;
num_buffs_reaped = ath11k_dp_rx_reap_mon_status_ring(ar->ab, dp->mac_id, &budget,
num_buffs_reaped = ath11k_dp_rx_reap_mon_status_ring(ar->ab, mac_id, &budget,
&pmon->rx_status_q);
if (num_buffs_reaped)
ath11k_dp_rx_mon_status_process_tlv(ar, budget, napi);
ath11k_dp_rx_mon_status_process_tlv(ar, mac_id, budget, napi);
return num_buffs_reaped;
}

71
drivers/net/wireless/ath/ath11k/dp_tx.c
Просмотреть файл

@ -786,9 +786,9 @@ int ath11k_dp_tx_htt_srng_setup(struct ath11k_base *ab, u32 ring_id,
cmd->ring_tail_off32_remote_addr_hi = (u64)tp_addr >>
HAL_ADDR_MSB_REG_SHIFT;
cmd->ring_msi_addr_lo = 0;
cmd->ring_msi_addr_hi = 0;
cmd->msi_data = 0;
cmd->ring_msi_addr_lo = params.msi_addr & 0xffffffff;
cmd->ring_msi_addr_hi = ((uint64_t)(params.msi_addr) >> 32) & 0xffffffff;
cmd->msi_data = params.msi_data;
cmd->intr_info = FIELD_PREP(
HTT_SRNG_SETUP_CMD_INTR_INFO_BATCH_COUNTER_THRESH,
@ -804,6 +804,15 @@ int ath11k_dp_tx_htt_srng_setup(struct ath11k_base *ab, u32 ring_id,
params.low_threshold);
}
ath11k_dbg(ab, ATH11k_DBG_HAL,
"%s msi_addr_lo:0x%x, msi_addr_hi:0x%x, msi_data:0x%x\n",
__func__, cmd->ring_msi_addr_lo, cmd->ring_msi_addr_hi,
cmd->msi_data);
ath11k_dbg(ab, ATH11k_DBG_HAL,
"ring_id:%d, ring_type:%d, intr_info:0x%x, flags:0x%x\n",
ring_id, ring_type, cmd->intr_info, cmd->info2);
ret = ath11k_htc_send(&ab->htc, ab->dp.eid, skb);
if (ret)
goto err_free;
@ -868,24 +877,27 @@ int ath11k_dp_tx_htt_h2t_ppdu_stats_req(struct ath11k *ar, u32 mask)
int len = sizeof(*cmd);
u8 pdev_mask;
int ret;
int i;
skb = ath11k_htc_alloc_skb(ab, len);
if (!skb)
return -ENOMEM;
for (i = 0; i < ab->hw_params.num_rxmda_per_pdev; i++) {
skb = ath11k_htc_alloc_skb(ab, len);
if (!skb)
return -ENOMEM;
skb_put(skb, len);
cmd = (struct htt_ppdu_stats_cfg_cmd *)skb->data;
cmd->msg = FIELD_PREP(HTT_PPDU_STATS_CFG_MSG_TYPE,
HTT_H2T_MSG_TYPE_PPDU_STATS_CFG);
skb_put(skb, len);
cmd = (struct htt_ppdu_stats_cfg_cmd *)skb->data;
cmd->msg = FIELD_PREP(HTT_PPDU_STATS_CFG_MSG_TYPE,
HTT_H2T_MSG_TYPE_PPDU_STATS_CFG);
pdev_mask = 1 << (ar->pdev_idx);
cmd->msg |= FIELD_PREP(HTT_PPDU_STATS_CFG_PDEV_ID, pdev_mask);
cmd->msg |= FIELD_PREP(HTT_PPDU_STATS_CFG_TLV_TYPE_BITMASK, mask);
pdev_mask = 1 << (i + 1);
cmd->msg |= FIELD_PREP(HTT_PPDU_STATS_CFG_PDEV_ID, pdev_mask);
cmd->msg |= FIELD_PREP(HTT_PPDU_STATS_CFG_TLV_TYPE_BITMASK, mask);
ret = ath11k_htc_send(&ab->htc, dp->eid, skb);
if (ret) {
dev_kfree_skb_any(skb);
return ret;
ret = ath11k_htc_send(&ab->htc, dp->eid, skb);
if (ret) {
dev_kfree_skb_any(skb);
return ret;
}
}
return 0;
@ -1028,10 +1040,23 @@ int ath11k_dp_tx_htt_monitor_mode_ring_config(struct ath11k *ar, bool reset)
HTT_RX_MON_MO_DATA_FILTER_FLASG3;
}
ret = ath11k_dp_tx_htt_rx_filter_setup(ar->ab, ring_id, dp->mac_id,
HAL_RXDMA_MONITOR_BUF,
DP_RXDMA_REFILL_RING_SIZE,
&tlv_filter);
if (ab->hw_params.rxdma1_enable) {
ret = ath11k_dp_tx_htt_rx_filter_setup(ar->ab, ring_id, dp->mac_id,
HAL_RXDMA_MONITOR_BUF,
DP_RXDMA_REFILL_RING_SIZE,
&tlv_filter);
} else if (!reset) {
/* set in monitor mode only */
for (i = 0; i < ab->hw_params.num_rxmda_per_pdev; i++) {
ring_id = dp->rx_mac_buf_ring[i].ring_id;
ret = ath11k_dp_tx_htt_rx_filter_setup(ar->ab, ring_id,
dp->mac_id + i,
HAL_RXDMA_BUF,
1024,
&tlv_filter);
}
}
if (ret)
return ret;
@ -1050,5 +1075,9 @@ int ath11k_dp_tx_htt_monitor_mode_ring_config(struct ath11k *ar, bool reset)
&tlv_filter);
}
if (!ar->ab->hw_params.rxdma1_enable)
mod_timer(&ar->ab->mon_reap_timer, jiffies +
msecs_to_jiffies(ATH11K_MON_TIMER_INTERVAL));
return ret;
}

2
drivers/net/wireless/ath/ath11k/hal.c
Просмотреть файл

@ -560,6 +560,8 @@ void ath11k_hal_srng_get_params(struct ath11k_base *ab, struct hal_srng *srng,
params->intr_batch_cntr_thres_entries =
srng->intr_batch_cntr_thres_entries;
params->low_threshold = srng->u.src_ring.low_threshold;
params->msi_addr = srng->msi_addr;
params->msi_data = srng->msi_data;
params->flags = srng->flags;
}

4
drivers/net/wireless/ath/ath11k/hal_rx.c
Просмотреть файл

@ -1195,7 +1195,7 @@ ath11k_hal_rx_parse_mon_status(struct ath11k_base *ab,
void ath11k_hal_rx_reo_ent_buf_paddr_get(void *rx_desc, dma_addr_t *paddr,
u32 *sw_cookie, void **pp_buf_addr,
u32 *msdu_cnt)
u8 *rbm, u32 *msdu_cnt)
{
struct hal_reo_entrance_ring *reo_ent_ring =
(struct hal_reo_entrance_ring *)rx_desc;
@ -1217,6 +1217,8 @@ void ath11k_hal_rx_reo_ent_buf_paddr_get(void *rx_desc, dma_addr_t *paddr,
*sw_cookie = FIELD_GET(BUFFER_ADDR_INFO1_SW_COOKIE,
buf_addr_info->info1);
*rbm = FIELD_GET(BUFFER_ADDR_INFO1_RET_BUF_MGR,
buf_addr_info->info1);
*pp_buf_addr = (void *)buf_addr_info;
}

2
drivers/net/wireless/ath/ath11k/hal_rx.h
Просмотреть файл

@ -321,7 +321,7 @@ void ath11k_hal_rx_reo_ent_paddr_get(struct ath11k_base *ab, void *desc,
dma_addr_t *paddr, u32 *desc_bank);
void ath11k_hal_rx_reo_ent_buf_paddr_get(void *rx_desc,
dma_addr_t *paddr, u32 *sw_cookie,
void **pp_buf_addr_info,
void **pp_buf_addr_info, u8 *rbm,
u32 *msdu_cnt);
enum hal_rx_mon_status
ath11k_hal_rx_parse_mon_status(struct ath11k_base *ab,

24
drivers/net/wireless/ath/ath11k/mac.c
Просмотреть файл

@ -4703,6 +4703,10 @@ static void ath11k_mac_op_configure_filter(struct ieee80211_hw *hw,
ath11k_warn(ar->ab,
"fail to set monitor filter: %d\n", ret);
}
ath11k_dbg(ar->ab, ATH11K_DBG_MAC,
"changed_flags:0x%x, total_flags:0x%x, reset_flag:%d\n",
changed_flags, *total_flags, reset_flag);
mutex_unlock(&ar->conf_mutex);
}
@ -5208,6 +5212,7 @@ ath11k_mac_op_assign_vif_chanctx(struct ieee80211_hw *hw,
struct ath11k_base *ab = ar->ab;
struct ath11k_vif *arvif = (void *)vif->drv_priv;
int ret;
struct peer_create_params param;
mutex_lock(&ar->conf_mutex);
@ -5217,7 +5222,8 @@ ath11k_mac_op_assign_vif_chanctx(struct ieee80211_hw *hw,
/* for QCA6390 bss peer must be created before vdev_start */
if (ab->hw_params.vdev_start_delay &&
arvif->vdev_type != WMI_VDEV_TYPE_AP) {
arvif->vdev_type != WMI_VDEV_TYPE_AP &&
arvif->vdev_type != WMI_VDEV_TYPE_MONITOR) {
memcpy(&arvif->chanctx, ctx, sizeof(*ctx));
mutex_unlock(&ar->conf_mutex);
return 0;
@ -5228,6 +5234,13 @@ ath11k_mac_op_assign_vif_chanctx(struct ieee80211_hw *hw,
return -EBUSY;
}
if (ab->hw_params.vdev_start_delay) {
param.vdev_id = arvif->vdev_id;
param.peer_type = WMI_PEER_TYPE_DEFAULT;
param.peer_addr = ar->mac_addr;
ret = ath11k_peer_create(ar, arvif, NULL, &param);
}
ret = ath11k_mac_vdev_start(arvif, &ctx->def);
if (ret) {
ath11k_warn(ab, "failed to start vdev %i addr %pM on freq %d: %d\n",
@ -5273,6 +5286,11 @@ ath11k_mac_op_unassign_vif_chanctx(struct ieee80211_hw *hw,
WARN_ON(!arvif->is_started);
if (ab->hw_params.vdev_start_delay &&
arvif->vdev_type == WMI_VDEV_TYPE_MONITOR &&
ath11k_peer_find_by_addr(ab, ar->mac_addr))
ath11k_peer_delete(ar, arvif->vdev_id, ar->mac_addr);
ret = ath11k_mac_vdev_stop(arvif);
if (ret)
ath11k_warn(ab, "failed to stop vdev %i: %d\n",
@ -5280,6 +5298,10 @@ ath11k_mac_op_unassign_vif_chanctx(struct ieee80211_hw *hw,
arvif->is_started = false;
if (ab->hw_params.vdev_start_delay &&
arvif->vdev_type == WMI_VDEV_TYPE_MONITOR)
ath11k_wmi_vdev_down(ar, arvif->vdev_id);
mutex_unlock(&ar->conf_mutex);
}