linux-kernel - Re: [PATCH v3] soc: qcom: llcc: Check return value on Broadcast

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Date: Tue, 13 Feb 2024 12:19:56 +0530
From: Mukesh Ojha <quic_mojha@...cinc.com>
To: Unnathi Chalicheemala <quic_uchalich@...cinc.com>,
        Bjorn Andersson
	<andersson@...nel.org>,
        Konrad Dybcio <konrad.dybcio@...aro.org>,
        Abel Vesa
	<abel.vesa@...aro.org>
CC: <linux-arm-msm@...r.kernel.org>, <linux-kernel@...r.kernel.org>,
        <kernel@...cinc.com>, Elliot Berman <quic_eberman@...cinc.com>
Subject: Re: [PATCH v3] soc: qcom: llcc: Check return value on Broadcast_OR
 reg read



On 2/13/2024 12:05 AM, Unnathi Chalicheemala wrote:
> Commit c72ca343f911 ("soc: qcom: llcc: Add v4.1 HW version support")
> introduced a new 4.1 if statement in llcc_update_act_ctrl() without
> considering that ret might be overwritten. So, add return value check
> after Broadcast_OR register read in llcc_update_act_ctrl().
> 
> Fixes: c72ca343f911 ("soc: qcom: llcc: Add v4.1 HW version support")
> Signed-off-by: Unnathi Chalicheemala <quic_uchalich@...cinc.com>
> Reviewed-by: Elliot Berman <quic_eberman@...cinc.com>
> 
> ---
> Changes in v3:
> - Bunched Fixes tag with other tags.
> - Modified commit message.
> - Link to v2: https://lore.kernel.org/all/20240210011415.3440236-1-quic_uchalich@quicinc.com/
> 
> Changes in v2:
> - Referenced right commit to be fixed in the commit message.
> - Added Elliot's R-B tag.
> - Modified commit message to better explain problem statement.
> - Link to v1: https://lore.kernel.org/all/20240202-fix_llcc_update_act_ctrl-v1-1-d36df95c8bd5@quicinc.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;


Nice catch, Thanks.
Reviewed-by: Mukesh Ojha <quic_mojha@...cinc.com>

-Mukesh

>   
>   	if (drv_data->version >= LLCC_VERSION_4_1_0_0)
>   		ret = regmap_write(drv_data->bcast_regmap, act_clear_reg,