From: Kang Yang <quic_kangyang@quicinc.com>
To: Kalle Valo <kvalo@kernel.org>
Cc: <ath12k@lists.infradead.org>, <linux-wireless@vger.kernel.org>
Subject: Re: [PATCH v6 08/11] wifi: ath12k: allow specific mgmt frame tx while vdev is not up
Date: Thu, 7 Mar 2024 17:46:45 +0800 [thread overview]
Message-ID: <4536614a-7f4c-420f-b042-f71cf46ba08d@quicinc.com> (raw)
In-Reply-To: <87il31r26k.fsf@kernel.org>
On 2/7/2024 12:24 AM, Kalle Valo wrote:
> Kang Yang <quic_kangyang@quicinc.com> writes:
>
>> In current code, the management frames must be sent after vdev is started.
>> But for P2P device, vdev won't start until P2P negotiation is done. So
>> this logic doesn't make sense for P2P device.
>>
>> Also use ar->conf_mutex to synchronize ar to avoid potential conflicts.
>
> Please do locking changes in a separate followup patch, I removed this
> in the pending branch:
>
> https://git.kernel.org/pub/scm/linux/kernel/git/kvalo/ath.git/commit/?h=pending&id=d357dcb3cd0cd3bf57064dc673b5477d884454b3
>
> I assume you are referring to ar->allocated_vdev_map and access to that
> indeed doesn't look consistent. Most of the places take conf->mutex but
> I see some places which it's accessed without the mutex, for example
> ath12k_mac_get_arvif_by_vdev_id() and ath12k_mac_get_ar_by_vdev_id().
>
Hi, kalle:
I just take a look for ath12k_mac_get_arvif_by_vdev_id() and
ath12k_mac_get_ar_by_vdev_id.
Both of them use rcu_read_lock(), so we don't need mutex_lock() anymore,
right?
I also tried to add mutex_lock() for them, cannot work well:
[ 7804.291286] BUG: sleeping function called from invalid context at
kernel/locking/mutex.c:585
[ 7804.291349] in_atomic(): 1, irqs_disabled(): 0, non_block: 0, pid: 0,
name: swapper/8
[ 7804.291358] preempt_count: 101, expected: 0
[ 7804.291366] RCU nest depth: 1, expected: 0
[ 7804.291374] 1 lock held by swapper/8/0:
……
> I recommend in the followup patch checking all the access to
> ar->allocated_vdev_map, fixing that if needed and adding documentation
> to struct ath12k::allocated_vdev_map how it's supposed to be protected.
>
So i think the initial change is sufficient: just use mutex_lock() in
ath12k_mgmt_over_wmi_tx_work().
next prev parent reply other threads:[~2024-03-07 9:47 UTC|newest]
Thread overview: 43+ messages / expand[flat|nested] mbox.gz Atom feed top
2024-01-30 4:02 [PATCH v6 00/11] wifi: ath12k: P2P support for WCN7850 Kang Yang
2024-01-30 4:02 ` [PATCH v6 01/11] wifi: ath12k: fix broken structure wmi_vdev_create_cmd Kang Yang
2024-01-30 16:48 ` Jeff Johnson
2024-02-05 15:46 ` Kalle Valo
2024-02-07 15:07 ` Kalle Valo
2024-01-30 4:02 ` [PATCH v6 02/11] wifi: ath12k: fix incorrect logic of calculating vdev_stats_id Kang Yang
2024-01-30 16:51 ` Jeff Johnson
2024-02-05 15:33 ` Kalle Valo
2024-01-30 4:02 ` [PATCH v6 03/11] wifi: ath12k: change interface combination for P2P mode Kang Yang
2024-01-30 16:52 ` Jeff Johnson
2024-01-30 4:02 ` [PATCH v6 04/11] wifi: ath12k: add P2P IE in beacon template Kang Yang
2024-01-30 17:02 ` Jeff Johnson
2024-02-05 16:24 ` Kalle Valo
2024-02-05 16:17 ` Kalle Valo
2024-02-05 16:35 ` Jeff Johnson
2024-02-06 9:52 ` Kalle Valo
2024-01-30 4:02 ` [PATCH v6 05/11] wifi: ath12k: implement handling of P2P NoA event Kang Yang
2024-01-30 17:14 ` Jeff Johnson
2024-02-02 13:53 ` Kalle Valo
2024-02-02 16:25 ` Jeff Johnson
2024-02-06 2:21 ` Kang Yang
2024-02-06 9:56 ` Kalle Valo
2024-02-06 16:11 ` Kalle Valo
2024-02-06 18:17 ` Kalle Valo
2024-02-07 17:43 ` Jeff Johnson
2024-02-07 4:36 ` Kang Yang
2024-01-30 4:02 ` [PATCH v6 06/11] wifi: ath12k: implement remain on channel for P2P mode Kang Yang
2024-01-30 17:16 ` Jeff Johnson
2024-01-30 4:02 ` [PATCH v6 07/11] wifi: ath12k: change WLAN_SCAN_PARAMS_MAX_IE_LEN from 256 to 512 Kang Yang
2024-01-30 17:19 ` Jeff Johnson
2024-01-30 4:03 ` [PATCH v6 08/11] wifi: ath12k: allow specific mgmt frame tx while vdev is not up Kang Yang
2024-01-30 17:23 ` Jeff Johnson
2024-02-06 16:24 ` Kalle Valo
2024-02-07 4:44 ` Kang Yang
2024-03-07 9:46 ` Kang Yang [this message]
2024-01-30 4:03 ` [PATCH v6 09/11] wifi: ath12k: move peer delete after vdev stop of station for WCN7850 Kang Yang
2024-01-30 17:24 ` Jeff Johnson
2024-01-30 4:03 ` [PATCH v6 10/11] wifi: ath12k: designating channel frequency for ROC scan Kang Yang
2024-01-30 17:24 ` Jeff Johnson
2024-01-30 4:03 ` [PATCH v6 11/11] wifi: ath12k: advertise P2P dev support for WCN7850 Kang Yang
2024-01-30 17:25 ` Jeff Johnson
2024-02-05 15:40 ` [PATCH v6 00/11] wifi: ath12k: P2P " Kalle Valo
2024-02-07 6:50 ` Kang Yang
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