1. 25 May, 2024 3 commits
  2. 21 May, 2024 1 commit
    • Baochen Qiang's avatar
      wifi: ath12k: fix Smatch warnings on ath12k_core_suspend() · 33370412
      Baochen Qiang authored
      Smatch is throwing below warning:
      
      Commit 692921ea ("wifi: ath12k: flush all packets before
      suspend") leads to the following Smatch static checker warning:
      
      	drivers/net/wireless/ath/ath12k/core.c:58 ath12k_core_suspend()
      	warn: sleeping in atomic context
      
      and also gives the reason:
      
      drivers/net/wireless/ath/ath12k/core.c
          48         int ret, i;
          49
          50         if (!ab->hw_params->supports_suspend)
          51                 return -EOPNOTSUPP;
          52
          53         rcu_read_lock();
                     ^^^^^^^^^^^^^^^
      Disables preemption.
      
          54         for (i = 0; i < ab->num_radios; i++) {
          55                 ar = ath12k_mac_get_ar_by_pdev_id(ab, i);
          56                 if (!ar)
          57                         continue;
      --> 58                 ret = ath12k_mac_wait_tx_complete(ar);
                                              ^^^^^^^
      Sleeping in atomic context.
      
          59                 if (ret) {
          60                         ath12k_warn(ab, "failed to wait tx complete: %d\n", ret);
          61                         rcu_read_unlock();
          62                         return ret;
          63                 }
          64         }
          65         rcu_read_unlock();
      
      But it is weird that no warning on this in run time even with
      CONFIG_DEBUG_ATOMIC_SLEEP=y. With some debug it is found that this is
      because: when system goes to suspend, ath12k_mac_op_stop() gets called
      where then in ath12k_mac_stop() ab->pdevs_active[ar->pdev_idx] is cleared.
      This results in ath12k_mac_get_ar_by_pdev_id() always returning a NULL ar,
      and thereby ath12k_mac_wait_tx_complete() never gets a chance to run.
      
      Fix it by retrieving ar directly from ab->pdevs[].ar instead of using
      ath12k_mac_get_ar_by_pdev_id(). Since ab->pdevs[].ar is set at boot time
      and won't get cleared when suspend, ath12k_mac_wait_tx_complete() won't
      be skipped. In addition, with ath12k_mac_get_ar_by_pdev_id() removed,
      rcu_read_lock()/unlock() are not needed any more, so remove them. This
      also fixes the warning above.
      
      Tested-on: WCN7850 hw2.0 PCI WLAN.HMT.1.0-03427-QCAHMTSWPL_V1.0_V2.0_SILICONZ-1.15378.4
      
      Fixes: 692921ea ("wifi: ath12k: flush all packets before suspend")
      Reported-by: default avatarDan Carpenter <dan.carpenter@linaro.org>
      Closes: https://lore.kernel.org/ath12k/7a96ca11-80b5-4751-8cfc-fa637f3aa63a@moroto.mountain/Signed-off-by: default avatarBaochen Qiang <quic_bqiang@quicinc.com>
      Acked-by: default avatarJeff Johnson <quic_jjohnson@quicinc.com>
      Signed-off-by: default avatarKalle Valo <quic_kvalo@quicinc.com>
      Link: https://msgid.link/20240511095045.9623-1-quic_bqiang@quicinc.com
      33370412
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