linux-kernel - Re: [PATCH 1/3] i2c: qcom-geni: Use the correct return value

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Message-ID: <YtXeiKWhFtldI2eE@baldur>
Date:   Mon, 18 Jul 2022 17:28:24 -0500
From:   Bjorn Andersson <bjorn.andersson@...aro.org>
To:     Vinod Koul <vkoul@...nel.org>
Cc:     Konrad Dybcio <konrad.dybcio@...ainline.org>,
        Wolfram Sang <wsa@...nel.org>, linux-arm-msm@...r.kernel.org,
        linux-i2c@...r.kernel.org, linux-kernel@...r.kernel.org
Subject: Re: [PATCH 1/3] i2c: qcom-geni: Use the correct return value

On Mon 18 Jul 00:36 CDT 2022, Vinod Koul wrote:

> On 16-07-22, 20:50, Bjorn Andersson wrote:
> > The introduction of GPI support moved things around and instead of
> > returning the result from geni_i2c_xfer() the number of messages in the
> > request was returned, ignoring the actual result. Fix this.
> 
> Thanks for the fix, looking at master_xfer() it does expect error
> return, so look good with one nit:
> 
> > 
> > Fixes: d8703554f4de ("i2c: qcom-geni: Add support for GPI DMA")
> > Signed-off-by: Bjorn Andersson <bjorn.andersson@...aro.org>
> > ---
> >  drivers/i2c/busses/i2c-qcom-geni.c | 2 +-
> >  1 file changed, 1 insertion(+), 1 deletion(-)
> > 
> > diff --git a/drivers/i2c/busses/i2c-qcom-geni.c b/drivers/i2c/busses/i2c-qcom-geni.c
> > index 6ac402ea58fb..3bec7c782824 100644
> > --- a/drivers/i2c/busses/i2c-qcom-geni.c
> > +++ b/drivers/i2c/busses/i2c-qcom-geni.c
> > @@ -688,7 +688,7 @@ static int geni_i2c_xfer(struct i2c_adapter *adap,
> >  	pm_runtime_put_autosuspend(gi2c->se.dev);
> >  	gi2c->cur = NULL;
> >  	gi2c->err = 0;
> 
> Unrelated, should gi2c->err be set to ret here..?
> 

When we reach this point we have concluded the current transfer
(successfully or not...), so I believe that the purpose of this line is
to clear the "error state" that might have occurred during that transfer.

I believe this line could be removed, as the first step in a transfer is
to clear the error state again. But as you suggest this is separate to
the proposed change.


May I have a R-b?

Regards,
Bjorn

> > -	return num;
> > +	return ret;
> >  }
> >  
> >  static u32 geni_i2c_func(struct i2c_adapter *adap)
> > -- 
> > 2.35.1
> 
> -- 
> ~Vinod