linux-kernel - Re: [PATCH] IB/hfi1: Fix potential deadlock on &sde->flushlist

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Date:   Wed, 5 Jul 2023 10:08:16 -0400
From:   Dennis Dalessandro <dennis.dalessandro@...nelisnetworks.com>
To:     Chengfeng Ye <dg573847474@...il.com>,
        Leon Romanovsky <leon@...nel.org>
Cc:     jgg@...pe.ca, linux-rdma@...r.kernel.org,
        linux-kernel@...r.kernel.org
Subject: Re: [PATCH] IB/hfi1: Fix potential deadlock on &sde->flushlist_lock

On 7/5/23 2:47 AM, Chengfeng Ye wrote:
>> Exactly, we already called to spin_lock_irqsave(), there is no value in
>> doing it twice.
> 
> Oh yeah, I just notice that the lock acquisition of &sde->flushlist_lock
> is always nested inside &sde->tail_lock due to the goto. Then it is true
> that no need for irq invariant lock/unlock on &sde->flushlist_lock.
> 
> Thanks much for your reply and your time.

Agree. Thanks Leon for looking at this. I was out of the office and just now
seen it.

-Denny