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

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Date: Fri, 2 Feb 2024 16:45:06 -0800
From: Unnathi Chalicheemala <quic_uchalich@...cinc.com>
To: Bjorn Andersson <andersson@...nel.org>,
        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: [PATCH] soc: qcom: llcc: Check return value on Broadcast_OR reg
 read

On 2/2/2024 3:20 PM, Bjorn Andersson wrote:
> 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
> 

Exactly right thank you for taking the time to review.
I will name the right fix in v2 patch.

>>
>>> 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>
>>>