[bug report] ath11k: Fix pktlog lite rx events

[Anilkumar Kolli]

On 2021-11-30 16:12, Dan Carpenter wrote:
> Hello Anilkumar Kolli,
> 
> The patch ab18e3bc1c13: "ath11k: Fix pktlog lite rx events" from Sep
> 28, 2021, leads to the following Smatch static checker warning:
> 
> 	drivers/net/wireless/ath/ath11k/dp_rx.c:3105 
> ath11k_dp_rx_process_mon_status()
> 	error: uninitialized symbol 'rx_buf_sz'.
> 
> drivers/net/wireless/ath/ath11k/dp_rx.c
>     3043 int ath11k_dp_rx_process_mon_status(struct ath11k_base *ab, 
> int mac_id,
>     3044                                     struct napi_struct *napi,
> int budget)
>     3045 {
>     3046         struct ath11k *ar = ath11k_ab_to_ar(ab, mac_id);
>     3047         enum hal_rx_mon_status hal_status;
>     3048         struct sk_buff *skb;
>     3049         struct sk_buff_head skb_list;
>     3050         struct hal_rx_mon_ppdu_info ppdu_info;
>     3051         struct ath11k_peer *peer;
>     3052         struct ath11k_sta *arsta;
>     3053         int num_buffs_reaped = 0;
>     3054         u32 rx_buf_sz;
>                  ^^^^^^^^^^^^^
> 
>     3055         u16 log_type = 0;
>     3056
>     3057         __skb_queue_head_init(&skb_list);
>     3058
>     3059         num_buffs_reaped =
> ath11k_dp_rx_reap_mon_status_ring(ab, mac_id, &budget,
>     3060
> &skb_list);
>     3061         if (!num_buffs_reaped)
>     3062                 goto exit;
>     3063
>     3064         while ((skb = __skb_dequeue(&skb_list))) {
>     3065                 memset(&ppdu_info, 0, sizeof(ppdu_info));
>     3066                 ppdu_info.peer_id = HAL_INVALID_PEERID;
>     3067
>     3068                 if 
> (ath11k_debugfs_is_pktlog_lite_mode_enabled(ar)) {
>     3069                         log_type = ATH11K_PKTLOG_TYPE_LITE_RX;
>     3070                         rx_buf_sz = DP_RX_BUFFER_SIZE_LITE;
>     3071                 } else if
> (ath11k_debugfs_is_pktlog_rx_stats_enabled(ar)) {
>     3072                         log_type = 
> ATH11K_PKTLOG_TYPE_RX_STATBUF;
>     3073                         rx_buf_sz = DP_RX_BUFFER_SIZE;
>     3074                 }
> 
> No else statement.
> 
>     3075
>     3076                 if (log_type)
>     3077                         trace_ath11k_htt_rxdesc(ar,
> skb->data, log_type, rx_buf_sz);
>     3078
>     3079                 hal_status =
> ath11k_hal_rx_parse_mon_status(ab, &ppdu_info, skb);
>     3080
>     3081                 if (ppdu_info.peer_id == HAL_INVALID_PEERID ||
>     3082                     hal_status != HAL_RX_MON_STATUS_PPDU_DONE) 
> {
>     3083                         dev_kfree_skb_any(skb);
>     3084                         continue;
>     3085                 }
>     3086
>     3087                 rcu_read_lock();
>     3088                 spin_lock_bh(&ab->base_lock);
>     3089                 peer = ath11k_peer_find_by_id(ab, 
> ppdu_info.peer_id);
>     3090
>     3091                 if (!peer || !peer->sta) {
>     3092                         ath11k_dbg(ab, ATH11K_DBG_DATA,
>     3093                                    "failed to find the peer
> with peer_id %d\n",
>     3094                                    ppdu_info.peer_id);
>     3095                         spin_unlock_bh(&ab->base_lock);
>     3096                         rcu_read_unlock();
>     3097                         dev_kfree_skb_any(skb);
>     3098                         continue;
>     3099                 }
>     3100
>     3101                 arsta = (struct ath11k_sta 
> *)peer->sta->drv_priv;
>     3102                 ath11k_dp_rx_update_peer_stats(arsta, 
> &ppdu_info);
>     3103
>     3104                 if (ath11k_debugfs_is_pktlog_peer_valid(ar,
> peer->addr))
> --> 3105                         trace_ath11k_htt_rxdesc(ar,
> skb->data, log_type, rx_buf_sz);
> 
>            ^^^^^^^^^
> Warning here.
> 
>     3106
>     3107                 spin_unlock_bh(&ab->base_lock);
>     3108                 rcu_read_unlock();
>     3109
>     3110                 dev_kfree_skb_any(skb);
>     3111         }
>     3112 exit:
>     3113         return num_buffs_reaped;
>     3114 }
> 
> regards,
> dan carpenter

Hi Dan carpenter

Thanks for reporting issue. Could you please help in reproducing the 
issue,

I tried to reproduce the warnings using command, but could not
     make C=1 CHECK="smatch -p=kernel" -C. 
drivers/net/wireless/ath/ath11k/ modules

My PC has,

gcc --version
gcc (Ubuntu 10.3.0-1ubuntu1~20.04) 10.3.0

sparse --version
v0.6.3-rc1

smatch --version
v0.5.0-7764-g0951ed59

Build LOGS:
drivers/net/wireless/ath/ath11k/dp.c:213 ath11k_dp_srng_msi_setup() 
error: uninitialized symbol 'addr_lo'.
drivers/net/wireless/ath/ath11k/dp.c:214 ath11k_dp_srng_msi_setup() 
error: uninitialized symbol 'addr_hi'.
   CHECK   drivers/net/wireless/ath/ath11k/dp_tx.c
   CHECK   drivers/net/wireless/ath/ath11k/dp_rx.c
drivers/net/wireless/ath/ath11k/dp_rx.c:5372 
ath11k_dp_rx_full_mon_deliver_ppdu() error: uninitialized symbol 'ret'.

Thanks
Anil.