[bug report] wifi: ath11k: fix peer addition/deletion error on sta band migration
Kalle Valo
kvalo at kernel.org
Mon Feb 13 04:26:59 PST 2023
Christian Marangi <ansuelsmth at gmail.com> writes:
> On Thu, Feb 09, 2023 at 12:35:20PM +0300, Dan Carpenter wrote:
>
>> Hello Christian Marangi,
>>
>> The patch d673cb6fe6c0: "wifi: ath11k: fix peer addition/deletion
>> error on sta band migration" from Sep 22, 2022, leads to the
>> following Smatch static checker warning:
>>
>> drivers/net/wireless/ath/ath11k/peer.c:396 ath11k_peer_create()
>> warn: sleeping in atomic context
>>
>> drivers/net/wireless/ath/ath11k/peer.c
>> 370 int ath11k_peer_create(struct ath11k *ar, struct ath11k_vif *arvif,
>> 371 struct ieee80211_sta *sta, struct peer_create_params *param)
>> 372 {
>> 373 struct ath11k_peer *peer;
>> 374 struct ath11k_sta *arsta;
>> 375 int ret, fbret;
>> 376
>> 377 lockdep_assert_held(&ar->conf_mutex);
>> 378
>> 379 if (ar->num_peers > (ar->max_num_peers - 1)) {
>> 380 ath11k_warn(ar->ab,
>> 381 "failed to create peer due to insufficient peer entry resource in firmware\n");
>> 382 return -ENOBUFS;
>> 383 }
>> 384
>> 385 spin_lock_bh(&ar->ab->base_lock);
>> ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
>> Holding a spin lock.
>>
>> 386 peer = ath11k_peer_find_by_addr(ar->ab, param->peer_addr);
>> 387 if (peer) {
>> 388 if (peer->vdev_id == param->vdev_id) {
>> 389 spin_unlock_bh(&ar->ab->base_lock);
>> 390 return -EINVAL;
>> 391 }
>> 392
>> 393 /* Assume sta is transitioning to another band.
>> 394 * Remove here the peer from rhash.
>> 395 */
>> --> 396 mutex_lock(&ar->ab->tbl_mtx_lock);
>> ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
>> So we can't take a mutex.
>>
>> 397 ath11k_peer_rhash_delete(ar->ab, peer);
>> 398 mutex_unlock(&ar->ab->tbl_mtx_lock);
>> 399 }
>> 400 spin_unlock_bh(&ar->ab->base_lock);
>> 401
>> 402 ret = ath11k_wmi_send_peer_create_cmd(ar, param);
>
> thanks for the report. I send a patch to ath mailing list that should
> fix this bug!
Christian, thanks for the patch. For reference here's the patch:
https://patchwork.kernel.org/project/linux-wireless/patch/20230209222622.1751-1-ansuelsmth@gmail.com/
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