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

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Date:   Tue, 15 Mar 2022 16:36:48 +0800
From:   Jinlong Mao <quic_jinlmao@...cinc.com>
To:     Suzuki K Poulose <suzuki.poulose@....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 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 ?

Thanks
Jinlong Mao