wifi: ath12k: Decrease ath12k_bss_assoc() stack usage

Currently when building ath12k with gcc-14.2.0 the following warning
is observed:

drivers/net/wireless/ath/ath12k/mac.c: In function 'ath12k_bss_assoc':
drivers/net/wireless/ath/ath12k/mac.c:3080:1: warning: the frame size of 1040 bytes is larger than 1024 bytes [-Wframe-larger-than=]

A major contributor to the stack usage in this function is:

	struct ath12k_wmi_peer_assoc_arg peer_arg;

Avoid the excess stack usage by dynamically allocating peer_arg
instead of declaring it on the stack.

Tested-on: QCN9274 hw2.0 PCI WLAN.WBE.1.3.1-00173-QCAHKSWPL_SILICONZ-1
Tested-on: WCN7850 hw2.0 PCI WLAN.HMT.1.0.c5-00481-QCAHMTSWPL_V1.0_V2.0_SILICONZ-3

Signed-off-by: Jeff Johnson <quic_jjohnson@quicinc.com>
Signed-off-by: Kalle Valo <quic_kvalo@quicinc.com>
Link: https://patch.msgid.link/20241217202618.1329312-3-kvalo@kernel.org
Signed-off-by: Jeff Johnson <jeff.johnson@oss.qualcomm.com>

diff --git a/drivers/net/wireless/ath/ath12k/mac.c b/drivers/net/wireless/ath/ath12k/mac.c
index 05d2c75e5df2928762d4db79abcfc333fadd5039..2a30a11903c5fd06359e7323ed134328f9ae2f22 100644 (file)
--- a/drivers/net/wireless/ath/ath12k/mac.c
+++ b/drivers/net/wireless/ath/ath12k/mac.c
@@ -3133,7 +3133,6 @@ static void ath12k_bss_assoc(struct ath12k *ar,
        struct ath12k_vif *ahvif = arvif->ahvif;
        struct ieee80211_vif *vif = ath12k_ahvif_to_vif(ahvif);
        struct ath12k_wmi_vdev_up_params params = {};
-       struct ath12k_wmi_peer_assoc_arg peer_arg = {};
        struct ieee80211_link_sta *link_sta;
        u8 link_id = bss_conf->link_id;
        struct ath12k_link_sta *arsta;
@@ -3145,6 +3144,11 @@ static void ath12k_bss_assoc(struct ath12k *ar,
 
        lockdep_assert_wiphy(ath12k_ar_to_hw(ar)->wiphy);
 
+       struct ath12k_wmi_peer_assoc_arg *peer_arg __free(kfree) =
+                                       kzalloc(sizeof(*peer_arg), GFP_KERNEL);
+       if (!peer_arg)
+               return;
+
        ath12k_dbg(ar->ab, ATH12K_DBG_MAC,
                   "mac vdev %i link id %u assoc bssid %pM aid %d\n",
                   arvif->vdev_id, link_id, arvif->bssid, ahvif->aid);
@@ -3177,11 +3181,11 @@ static void ath12k_bss_assoc(struct ath12k *ar,
                return;
        }
 
-       ath12k_peer_assoc_prepare(ar, arvif, arsta, &peer_arg, false);
+       ath12k_peer_assoc_prepare(ar, arvif, arsta, peer_arg, false);
 
        rcu_read_unlock();
 
-       ret = ath12k_wmi_send_peer_assoc_cmd(ar, &peer_arg);
+       ret = ath12k_wmi_send_peer_assoc_cmd(ar, peer_arg);
        if (ret) {
                ath12k_warn(ar->ab, "failed to run peer assoc for %pM vdev %i: %d\n",
                            bss_conf->bssid, arvif->vdev_id, ret);