linux-kernel - Re: [PATCH V2 net-next 2/2] net: qrtr: Add support for processing DEL

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Message-ID: <dffdbd5c-3d21-5cee-03d6-b89e0caf9a41@quicinc.com>
Date:   Mon, 25 Sep 2023 16:55:38 -0700
From:   Chris Lew <quic_clew@...cinc.com>
To:     Sricharan Ramabadhran <quic_srichara@...cinc.com>,
        <mani@...nel.org>, <davem@...emloft.net>, <edumazet@...gle.com>,
        <kuba@...nel.org>, <pabeni@...hat.com>,
        <linux-arm-msm@...r.kernel.org>, <linux-kernel@...r.kernel.org>,
        <netdev@...r.kernel.org>, <quic_viswanat@...cinc.com>,
        <horms@...nel.org>
Subject: Re: [PATCH V2 net-next 2/2] net: qrtr: Add support for processing
 DEL_PROC type control message



On 9/23/2023 6:49 PM, Sricharan Ramabadhran wrote:
>>>    */
>>>   struct qrtr_node {
>>>       struct mutex ep_lock;
>>> @@ -134,6 +138,9 @@ struct qrtr_node {
>>>       struct sk_buff_head rx_queue;
>>>       struct list_head item;
>>> +    struct kthread_worker kworker;
>>> +    struct task_struct *task;
>>> +    struct kthread_work read_data;
>>
>> I think our own kthread here might have been overkill. I forget why we 
>> needed it instead of using a workqueue.
> 
>    I added a workqueue here because endpoint post is getting called from
>    atomic contexts and below DEL_PROC handling acquires qrtr_tx_lock.


Got it, I think deferring the processing makes sense. I was more 
focusing on the fact that we are creating our own kthread instead of 
using the system workqueues.

Prior to commit e04df98adf7d ("net: qrtr: Remove receive worker"), this 
was a work_struct. I think we should keep it as a work_struct until we 
can motivate why a qrtr_node needs it's own kthread.