linux-kernel - Re: [PATCH] IB/rdmavt: add lock to call to rvt_error

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Message-ID: <20220408163046.GA3612436@nvidia.com>
Date:   Fri, 8 Apr 2022 13:30:46 -0300
From:   Jason Gunthorpe <jgg@...dia.com>
To:     Niels Dossche <dossche.niels@...il.com>
Cc:     linux-rdma@...r.kernel.org, linux-kernel@...r.kernel.org,
        Dennis Dalessandro <dennis.dalessandro@...nelisnetworks.com>,
        Mike Marciniszyn <mike.marciniszyn@...nelisnetworks.com>
Subject: Re: [PATCH] IB/rdmavt: add lock to call to rvt_error_qp to prevent a
 race condition

On Mon, Feb 28, 2022 at 05:53:30PM +0100, Niels Dossche wrote:
> The documentation of the function rvt_error_qp says both r_lock and
> s_lock need to be held when calling that function.
> It also asserts using lockdep that both of those locks are held.
> However, the commit I referenced in Fixes accidentally makes the call
> to rvt_error_qp in rvt_ruc_loopback no longer covered by r_lock.
> This results in the lockdep assertion failing and also possibly in a
> race condition.
> 
> Fixes: d757c60eca9b ("IB/rdmavt: Fix concurrency panics in QP post_send and modify to error")
> Signed-off-by: Niels Dossche <dossche.niels@...il.com>
> ---
>  drivers/infiniband/sw/rdmavt/qp.c | 6 +++++-
>  1 file changed, 5 insertions(+), 1 deletion(-)

Applied to for-rc, thanks

Jason