package/kernel/mac80211/patches/ath11k/0036-wifi-ath11k-fix-SAC-bug-on-peer-addition-with-sta-ba.patch

   1 From 60b7d62ba8cdbd073997bff0f1cdae8d844002c0 Mon Sep 17 00:00:00 2001
   2 From: Christian Marangi <ansuelsmth@gmail.com>
   3 Date: Thu, 9 Feb 2023 23:26:22 +0100
   4 Subject: [PATCH] wifi: ath11k: fix SAC bug on peer addition with sta band
   5  migration
   6
   7 Fix sleep in atomic context warning detected by Smatch static checker
   8 analyzer.
   9
  10 Following the locking pattern for peer_rhash_add lock tbl_mtx_lock mutex
  11 always even if sta is not transitioning to another band.
  12 This is peer_add function and a more secure locking should not cause
  13 performance regression.
  14
  15 Tested-on: IPQ8074 hw2.0 AHB WLAN.HK.2.5.0.1-01208-QCAHKSWPL_SILICONZ-1
  16
  17 Fixes: d673cb6fe6c0 ("wifi: ath11k: fix peer addition/deletion error on sta band migration")
  18 Reported-by: Dan Carpenter <error27@gmail.com>
  19 Signed-off-by: Christian Marangi <ansuelsmth@gmail.com>
  20 Signed-off-by: Kalle Valo <quic_kvalo@quicinc.com>
  21 Link: https://lore.kernel.org/r/20230209222622.1751-1-ansuelsmth@gmail.com
  22 ---
  23  drivers/net/wireless/ath/ath11k/peer.c | 5 +++--
  24  1 file changed, 3 insertions(+), 2 deletions(-)
  25
  26 --- a/drivers/net/wireless/ath/ath11k/peer.c
  27 +++ b/drivers/net/wireless/ath/ath11k/peer.c
  28 @@ -382,22 +382,23 @@ int ath11k_peer_create(struct ath11k *ar
  29                 return -ENOBUFS;
  30         }
  31
  32 +       mutex_lock(&ar->ab->tbl_mtx_lock);
  33         spin_lock_bh(&ar->ab->base_lock);
  34         peer = ath11k_peer_find_by_addr(ar->ab, param->peer_addr);
  35         if (peer) {
  36                 if (peer->vdev_id == param->vdev_id) {
  37                         spin_unlock_bh(&ar->ab->base_lock);
  38 +                       mutex_unlock(&ar->ab->tbl_mtx_lock);
  39                         return -EINVAL;
  40                 }
  41
  42                 /* Assume sta is transitioning to another band.
  43                  * Remove here the peer from rhash.
  44                  */
  45 -               mutex_lock(&ar->ab->tbl_mtx_lock);
  46                 ath11k_peer_rhash_delete(ar->ab, peer);
  47 -               mutex_unlock(&ar->ab->tbl_mtx_lock);
  48         }
  49         spin_unlock_bh(&ar->ab->base_lock);
  50 +       mutex_unlock(&ar->ab->tbl_mtx_lock);
  51
  52         ret = ath11k_wmi_send_peer_create_cmd(ar, param);
  53         if (ret) {