linux-kernel - Re: Re: [PATCH] soc: qcom: llcc: Check return value on Broadcast

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Date: Fri, 2 Feb 2024 17:20:46 -0600
From: Bjorn Andersson <andersson@...nel.org>
To: Unnathi Chalicheemala <quic_uchalich@...cinc.com>, 
	Konrad Dybcio <konrad.dybcio@...aro.org>, Satya Durga Srinivasu Prabhala <quic_satyap@...cinc.com>, 
	linux-arm-msm@...r.kernel.org, linux-kernel@...r.kernel.org, kernel@...cinc.com, 
	Dmitry Baryshkov <dmitry.baryshkov@...aro.org>
Subject: Re: Re: [PATCH] soc: qcom: llcc: Check return value on Broadcast_OR
 reg read

On Fri, Feb 02, 2024 at 11:56:53AM -0800, Elliot Berman wrote:
> On Fri, Feb 02, 2024 at 11:47:43AM -0800, Unnathi Chalicheemala wrote:
> > Commit a3134fb09e0b ("drivers: soc: Add LLCC driver") didn't
> > check return value after Broadcast_OR register read in
> > llcc_update_act_ctrl(), add it.
> > 
> 
> Reviewed-by: Elliot Berman <quic_eberman@...cinc.com>
> 
> You'll probably want to add:
> 
> Fixes: a3134fb09e0b ("drivers: soc: Add LLCC driver")

No, this was correct in a3134fb09e0b, ret was returned on the following
line. The problem was introduced when the new 4.1 if statement was
introduced without considering that ret might be overwritten.

Fixes: c72ca343f911 ("soc: qcom: llcc: Add v4.1 HW version support")

Regards,
Bjorn

> 
> > Signed-off-by: Unnathi Chalicheemala <quic_uchalich@...cinc.com>
> > ---
> >  drivers/soc/qcom/llcc-qcom.c | 2 ++
> >  1 file changed, 2 insertions(+)
> > 
> > diff --git a/drivers/soc/qcom/llcc-qcom.c b/drivers/soc/qcom/llcc-qcom.c
> > index 4ca88eaebf06..cbef0dea1d5d 100644
> > --- a/drivers/soc/qcom/llcc-qcom.c
> > +++ b/drivers/soc/qcom/llcc-qcom.c
> > @@ -859,6 +859,8 @@ static int llcc_update_act_ctrl(u32 sid,
> >  	ret = regmap_read_poll_timeout(drv_data->bcast_regmap, status_reg,
> >  				      slice_status, !(slice_status & status),
> >  				      0, LLCC_STATUS_READ_DELAY);
> > +	if (ret)
> > +		return ret;
> >  
> >  	if (drv_data->version >= LLCC_VERSION_4_1_0_0)
> >  		ret = regmap_write(drv_data->bcast_regmap, act_clear_reg,
> > 
> > ---
> > base-commit: 021533194476035883300d60fbb3136426ac8ea5
> > change-id: 20240202-fix_llcc_update_act_ctrl-64908aed9450
> > 
> > Best regards,
> > -- 
> > Unnathi Chalicheemala <quic_uchalich@...cinc.com>
> >