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

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Message-ID: <a1790ad9-b5e0-9a00-debc-fc8ef2c757cb@arm.com>
Date:   Thu, 10 Mar 2022 09:10:55 +0000
From:   Suzuki K Poulose <suzuki.poulose@....com>
To:     Mao Jinlong <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

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