linux-kernel - Re: [PATCH] rdma_rxe: call comp_handler without holding cq->cq

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Message-ID: <4b91db63-8a6d-4491-8882-276f115a4df8@linux.dev>
Date: Thu, 14 Aug 2025 21:25:00 -0700
From: Zhu Yanjun <yanjun.zhu@...ux.dev>
To: Daisuke Matsuda <dskmtsd@...il.com>,
 Philipp Reisner <philipp.reisner@...bit.com>
Cc: Zhu Yanjun <zyjzyj2000@...il.com>, Jason Gunthorpe <jgg@...pe.ca>,
 Leon Romanovsky <leon@...nel.org>, linux-rdma@...r.kernel.org,
 linux-kernel@...r.kernel.org
Subject: Re: [PATCH] rdma_rxe: call comp_handler without holding cq->cq_lock

>>>
>>> ===
>>> diff --git a/drivers/infiniband/sw/rxe/rxe_comp.c 
>>> b/drivers/infiniband/sw/rxe/rxe_comp.c
>>> index a5b2b62f596b..a10a173e53cf 100644
>>> --- a/drivers/infiniband/sw/rxe/rxe_comp.c
>>> +++ b/drivers/infiniband/sw/rxe/rxe_comp.c
>>> @@ -454,7 +454,7 @@ static void do_complete(struct rxe_qp *qp, 
>>> struct rxe_send_wqe *wqe)
>>>         queue_advance_consumer(qp->sq.queue, QUEUE_TYPE_FROM_CLIENT);
>>>
>>>         if (post)
>>> -               rxe_cq_post(qp->scq, &cqe, 0);
>>> +               while (rxe_cq_post(qp->scq, &cqe, 0) == -EBUSY);

Just now the maillist notified the mail was not sent successfully. Thus 
I resend it now.


Do you make tests with your commit in the local hosts?


I have applied your commit and made tests in my local host. I run the 
tests for 10000 times.

Sometimes problems occurred. I am not sure if this problem is related 
with this commit or not.

I will make further investigations about this problem.

Yanjun.Zhu