linux-kernel - Re: [PATCH v3] coresight: core: Fix coresight device probe failure issue

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Date:   Wed, 4 May 2022 12:01:46 +0100
From:   Suzuki K Poulose <suzuki.poulose@....com>
To:     Jinlong Mao <quic_jinlmao@...cinc.com>,
        Mathieu Poirier <mathieu.poirier@...aro.org>,
        Mike Leach <mike.leach@...aro.org>,
        Leo Yan <leo.yan@...aro.org>,
        Alexander Shishkin <alexander.shishkin@...ux.intel.com>
Cc:     coresight@...ts.linaro.org, linux-arm-kernel@...ts.infradead.org,
        linux-kernel@...r.kernel.org, linux-arm-msm@...r.kernel.org,
        Tingwei Zhang <quic_tingweiz@...cinc.com>,
        Yuanfang Zhang <quic_yuanfang@...cinc.com>,
        Tao Zhang <quic_taozha@...cinc.com>,
        Hao Zhang <quic_hazha@...cinc.com>
Subject: Re: [PATCH v3] coresight: core: Fix coresight device probe failure
 issue

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@....com>
>>>>> Suggested-by: Mike Leach <mike.leach@...aro.org>
>>>>> Signed-off-by: Mao Jinlong <quic_jinlmao@...cinc.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