linux-kernel - Re: [PATCH 2/2] coresight: Abort probe for missing CPU phandle

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Message-ID: <e3e13629-a723-8b08-cbae-5a3295170900@codeaurora.org>
Date:   Thu, 20 Jun 2019 20:25:16 +0530
From:   Sai Prakash Ranjan <saiprakash.ranjan@...eaurora.org>
To:     Suzuki K Poulose <suzuki.poulose@....com>,
        mathieu.poirier@...aro.org, leo.yan@...aro.org,
        alexander.shishkin@...ux.intel.com, david.brown@...aro.org,
        mark.rutland@....com
Cc:     rnayak@...eaurora.org, vivek.gautam@...eaurora.org,
        sibis@...eaurora.org, linux-arm-kernel@...ts.infradead.org,
        linux-kernel@...r.kernel.org, linux-arm-msm@...r.kernel.org
Subject: Re: [PATCH 2/2] coresight: Abort probe for missing CPU phandle

On 6/20/2019 7:28 PM, Suzuki K Poulose wrote:
> 
> 
> On 20/06/2019 14:45, Sai Prakash Ranjan wrote:
>> Currently the coresight etm and cpu-debug drivers
>> assume the affinity to CPU0 returned by coresight
>> platform and continue the probe in case of missing
>> CPU phandle. This is not true and leads to crash
>> in some cases, so abort the probe in case of missing
>> CPU phandle.
>>
>> Signed-off-by: Sai Prakash Ranjan <saiprakash.ranjan@...eaurora.org>
>> ---
>>   drivers/hwtracing/coresight/coresight-cpu-debug.c | 3 +++
>>   drivers/hwtracing/coresight/coresight-etm3x.c     | 3 +++
>>   drivers/hwtracing/coresight/coresight-etm4x.c     | 3 +++
>>   3 files changed, 9 insertions(+)
>>
>> diff --git a/drivers/hwtracing/coresight/coresight-cpu-debug.c 
>> b/drivers/hwtracing/coresight/coresight-cpu-debug.c
>> index 07a1367c733f..43f32fa71ff9 100644
>> --- a/drivers/hwtracing/coresight/coresight-cpu-debug.c
>> +++ b/drivers/hwtracing/coresight/coresight-cpu-debug.c
>> @@ -579,6 +579,9 @@ static int debug_probe(struct amba_device *adev, 
>> const struct amba_id *id)
>>           return -ENOMEM;
>>       drvdata->cpu = coresight_get_cpu(dev);
>> +    if (drvdata->cpu == -ENODEV)
>> +        return -ENODEV;
> 
> if (drvdata->cpu < 0)
>      return drvdata->cpu;
> 
> Same everywhere below ?
> 
> Also, I would like to hear Mathieu's thoughts on this change. If he's OK
> with it:
> 
> Reviewed-by: Suzuki K Poulose <suzuki.poulose@....com> with the change 
> above.
> 
> 

Thanks, I will make the change and repost.

-Sai

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