linux-kernel - Re: [PATCH 1/6] i3c: master: svc: fix race condition in ibi work thread

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Message-ID: <ZS6j/tpqEppFADk1@lizhi-Precision-Tower-5810>
Date:   Tue, 17 Oct 2023 11:10:54 -0400
From:   Frank Li <Frank.li@....com>
To:     Miquel Raynal <miquel.raynal@...tlin.com>
Cc:     conor.culhane@...vaco.com, alexandre.belloni@...tlin.com,
        joe@...ches.com, linux-i3c@...ts.infradead.org,
        linux-kernel@...r.kernel.org, imx@...ts.linux.dev
Subject: Re: [PATCH 1/6] i3c: master: svc: fix race condition in ibi work
 thread

On Tue, Oct 17, 2023 at 04:49:46PM +0200, Miquel Raynal wrote:
> Hi Frank,
> 
> Frank.li@....com wrote on Tue, 17 Oct 2023 10:37:57 -0400:
> 
> > On Tue, Oct 17, 2023 at 04:16:58PM +0200, Miquel Raynal wrote:
> > > Hi Frank,
> > > 
> > > Frank.Li@....com wrote on Mon, 16 Oct 2023 11:32:27 -0400:
> > >   
> > > > The ibi work thread operates asynchronously with other transfers, such as
> > > > svc_i3c_master_priv_xfers(). Introduces mutex protection to ensure the  
> > > 
> > > Introduce
> > >   
> > > > completion of the entire i3c/i2c transaction.  
> > > 
> > > Did you experience faulty conditions or was it reported thanks to
> > > static analysis?  
> > 
> > Yes, I met. But it needs my slave part patches, which will be ready sent
> > out review soon.
> 
> I believe several of the "fixes" in this series are related to newer
> uses (typically your i3c slave support) which were not in the scope of
> the original submission. As these new features are not supposed to be
> backported in stable kernels and because these are new corner cases,you
> may drop the CC:/Fixes tags to avoid useless backports.

I don't think so. The issue exists. Just difficult to find it. If there are
i3c device that use IBI frequently. The problem should be trigger. My case
just make it easy to trigger the problem.

In previous existed code, IBI is supported.

I think it is typical case, which need CC/Fixes.

Frank

> 
> Some of them however are real fixes for situations we may happen with
> the current level of support, please keep the tags in these, and move
> them all to the beginning of your series.
> 
> Thanks,
> Miquèl