[PATCH v2 2/2] wifi: ath11k: add srng->lock for ath11k_hal_srng_* in monitor mode

[Jeff Johnson]

On 9/24/2024 3:23 AM, Kang Yang wrote:
> ath11k_hal_srng_* should be used with srng->lock to protect srng data.
> 
> For ath11k_dp_rx_mon_dest_process() and ath11k_dp_full_mon_process_rx(),
> they use ath11k_hal_srng_* for many times but never call srng->lock.
> 
> So when running (full) monitor mode, warning will occurr:

WARNING:TYPO_SPELLING: 'occurr' may be misspelled - perhaps 'occur'?

> RIP: 0010:ath11k_hal_srng_dst_peek+0x18/0x30 [ath11k]
> Call Trace:

WARNING:MISSING_FIXES_TAG: The commit message has 'Call Trace:', perhaps it
also needs a 'Fixes:' tag?

>  ? ath11k_hal_srng_dst_peek+0x18/0x30 [ath11k]
>  ath11k_dp_rx_process_mon_status+0xc45/0x1190 [ath11k]
>  ? idr_alloc_u32+0x97/0xd0
>  ath11k_dp_rx_process_mon_rings+0x32a/0x550 [ath11k]
>  ath11k_dp_service_srng+0x289/0x5a0 [ath11k]
>  ath11k_pcic_ext_grp_napi_poll+0x30/0xd0 [ath11k]
>  __napi_poll+0x30/0x1f0
>  net_rx_action+0x198/0x320
>  __do_softirq+0xdd/0x319
> 
> So add srng->lock for them to avoid such warnings.
> 
> Tested-on: WCN6855 hw2.0 PCI WLAN.HSP.1.1-03125-QCAHSPSWPL_V1_V2_SILICONZ_LITE-3.6510.30
> Tested-on: QCN9074 hw1.0 PCI WLAN.HK.2.7.0.1-01744-QCAHKSWPL_SILICONZ-1

should be blank line here since the Tested-on tags are ath-specific and not
"official" kernel.org tags

> Signed-off-by: Kang Yang <quic_kangyang at quicinc.com>
> ---
>  drivers/net/wireless/ath/ath11k/dp_rx.c | 10 ++++++++--
>  1 file changed, 8 insertions(+), 2 deletions(-)
> 
> diff --git a/drivers/net/wireless/ath/ath11k/dp_rx.c b/drivers/net/wireless/ath/ath11k/dp_rx.c
> index 072963d3396c..5fd681b5df2e 100644
> --- a/drivers/net/wireless/ath/ath11k/dp_rx.c
> +++ b/drivers/net/wireless/ath/ath11k/dp_rx.c
> @@ -5146,7 +5146,7 @@ static void ath11k_dp_rx_mon_dest_process(struct ath11k *ar, int mac_id,
>  	struct ath11k_mon_data *pmon = (struct ath11k_mon_data *)&dp->mon_data;
>  	const struct ath11k_hw_hal_params *hal_params;
>  	void *ring_entry;
> -	void *mon_dst_srng;
> +	struct hal_srng *mon_dst_srng;
>  	u32 ppdu_id;
>  	u32 rx_bufs_used;
>  	u32 ring_id;
> @@ -5163,6 +5163,7 @@ static void ath11k_dp_rx_mon_dest_process(struct ath11k *ar, int mac_id,
>  
>  	spin_lock_bh(&pmon->mon_lock);
>  
> +	spin_lock_bh(&mon_dst_srng->lock);
>  	ath11k_hal_srng_access_begin(ar->ab, mon_dst_srng);
>  
>  	ppdu_id = pmon->mon_ppdu_info.ppdu_id;
> @@ -5221,6 +5222,7 @@ static void ath11k_dp_rx_mon_dest_process(struct ath11k *ar, int mac_id,
>  								mon_dst_srng);
>  	}
>  	ath11k_hal_srng_access_end(ar->ab, mon_dst_srng);
> +	spin_unlock_bh(&mon_dst_srng->lock);
>  
>  	spin_unlock_bh(&pmon->mon_lock);
>  
> @@ -5607,7 +5609,7 @@ static int ath11k_dp_full_mon_process_rx(struct ath11k_base *ab, int mac_id,
>  	struct hal_sw_mon_ring_entries *sw_mon_entries;
>  	struct ath11k_pdev_mon_stats *rx_mon_stats;
>  	struct sk_buff *head_msdu, *tail_msdu;
> -	void *mon_dst_srng = &ar->ab->hal.srng_list[dp->rxdma_mon_dst_ring.ring_id];
> +	struct hal_srng *mon_dst_srng;
>  	void *ring_entry;
>  	u32 rx_bufs_used = 0, mpdu_rx_bufs_used;
>  	int quota = 0, ret;
> @@ -5623,6 +5625,9 @@ static int ath11k_dp_full_mon_process_rx(struct ath11k_base *ab, int mac_id,
>  		goto reap_status_ring;
>  	}
>  
> +	mon_dst_srng = &ar->ab->hal.srng_list[dp->rxdma_mon_dst_ring.ring_id];
> +	spin_lock_bh(&mon_dst_srng->lock);
> +
>  	ath11k_hal_srng_access_begin(ar->ab, mon_dst_srng);
>  	while ((ring_entry = ath11k_hal_srng_dst_peek(ar->ab, mon_dst_srng))) {
>  		head_msdu = NULL;
> @@ -5666,6 +5671,7 @@ static int ath11k_dp_full_mon_process_rx(struct ath11k_base *ab, int mac_id,
>  	}
>  
>  	ath11k_hal_srng_access_end(ar->ab, mon_dst_srng);
> +	spin_unlock_bh(&mon_dst_srng->lock);
>  	spin_unlock_bh(&pmon->mon_lock);
>  
>  	if (rx_bufs_used) {

actual patch LGTM