netdev - Re: [PATCH net-next 08/14] ice: protect init and calibrating fields with spinlock

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Date:   Fri, 2 Dec 2022 15:07:16 -0800
From:   Jacob Keller <jacob.e.keller@...el.com>
To:     Leon Romanovsky <leon@...nel.org>,
        Tony Nguyen <anthony.l.nguyen@...el.com>
CC:     <davem@...emloft.net>, <kuba@...nel.org>, <pabeni@...hat.com>,
        <edumazet@...gle.com>, <netdev@...r.kernel.org>,
        <richardcochran@...il.com>, Gurucharan G <gurucharanx.g@...el.com>
Subject: Re: [PATCH net-next 08/14] ice: protect init and calibrating fields
 with spinlock



On 12/2/2022 10:36 AM, Jacob Keller wrote:
> I am not sure what the best way to fix c) is. Perhaps an additional flag 
> of some sort which indicates that the timestamp thread function is 
> processing so that tear down can wait until after the interrupt function 
> completes. Once init is cleared, the function will stop re-executing, 
> but we need a way to wait until it has stopped. That method in tear down 
> can't hold the lock or else we'd potentially deadlock... Maybe an 
> additional "processing" flag which is set under lock only if the init 
> flag is set? and then cleared when the function exits. Then the tear 
> down can check and wait for the processing to be complete? Hmm.
> 

For what its worth, I think this is an issue regardless of whether this 
series is applied, since the change from kthread to threaded IRQ was 
done a while ago.