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Message-ID: <93f0e003-e9ce-c37f-e603-ddf22ffec0d6@arm.com>
Date:   Wed, 4 May 2022 12:01:46 +0100
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Subject: Re: [PATCH v3] coresight: core: Fix coresight device probe failure
 issue
To:     Jinlong Mao <quic_jinlmao@quicinc.com>,
        Mathieu Poirier <mathieu.poirier@linaro.org>,
        Mike Leach <mike.leach@linaro.org>,
        Leo Yan <leo.yan@linaro.org>,
        Alexander Shishkin <alexander.shishkin@linux.intel.com>
Cc:     coresight@lists.linaro.org, linux-arm-kernel@lists.infradead.org,
        linux-kernel@vger.kernel.org, linux-arm-msm@vger.kernel.org,
        Tingwei Zhang <quic_tingweiz@quicinc.com>,
        Yuanfang Zhang <quic_yuanfang@quicinc.com>,
        Tao Zhang <quic_taozha@quicinc.com>,
        Hao Zhang <quic_hazha@quicinc.com>
References: <20220309142206.15632-1-quic_jinlmao@quicinc.com>
 <a1790ad9-b5e0-9a00-debc-fc8ef2c757cb@arm.com>
 <9cbb2e86-640f-4b5d-22ff-00c63a1b9743@quicinc.com>
 <99845680-c2a5-2538-a57c-6fbf395faa8b@arm.com>
 <0ef5aa68-fc1c-6f0b-a1cb-46c5548952db@quicinc.com>
From:   Suzuki K Poulose <suzuki.poulose@arm.com>
In-Reply-To: <0ef5aa68-fc1c-6f0b-a1cb-46c5548952db@quicinc.com>
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On 15/03/2022 08:52, Jinlong Mao wrote:
> 
> On 3/15/2022 4:42 PM, Suzuki K Poulose wrote:
>> On 15/03/2022 08:36, Jinlong Mao wrote:
>>> On 3/10/2022 5:10 PM, Suzuki K Poulose wrote:
>>>> Hi Jinlong
>>>>
>>>>
>>>> On 09/03/2022 14:22, Mao Jinlong wrote:
>>>>> It is possibe that probe failure issue happens when the device
>>>>> and its child_device's probe happens at the same time.
>>>>> In coresight_make_links, has_conns_grp is true for parent, but
>>>>> has_conns_grp is false for child device as has_conns_grp is set
>>>>> to true in coresight_create_conns_sysfs_group. The probe of parent
>>>>> device will fail at this condition. Add has_conns_grp check for
>>>>> child device before make the links and make the process from
>>>>> device_register to connection_create be atomic to avoid this
>>>>> probe failure issue.
>>>>>
>>>>> Suggested-by: Suzuki K Poulose <suzuki.poulose@arm.com>
>>>>> Suggested-by: Mike Leach <mike.leach@linaro.org>
>>>>> Signed-off-by: Mao Jinlong <quic_jinlmao@quicinc.com>
>>>>
>>>> Thanks for the rework. The patch looks good to me.
>>>>
>>>> Suzuki
>>> Thanks Suzuki.
>>>
>>> Hi Mathieu & Mike,
>>>
>>> Could you please help to review and provide your comments for the 
>>> PATCH V3 ?
>>
>> Thats what I just said above. The patch looks good to me, I can queue
>> this in the next cycle.

Queued here:

https://git.kernel.org/pub/scm/linux/kernel/git/coresight/linux.git/commit/?h=next&id=8c1d3f79d9ca48e406b78e90e94cf09a8c076bf2

Cheers
Suzuki