From: Leo Yan <leo.yan@arm.com>
To: Suzuki K Poulose <suzuki.poulose@arm.com>
Cc: Mike Leach <mike.leach@arm.com>,
James Clark <james.clark@linaro.org>,
Alexander Shishkin <alexander.shishkin@linux.intel.com>,
Greg Kroah-Hartman <gregkh@linuxfoundation.org>,
Mathieu Poirier <mathieu.poirier@linaro.org>,
Mao Jinlong <quic_jinlmao@quicinc.com>,
coresight@lists.linaro.org, linux-arm-kernel@lists.infradead.org,
linux-kernel@vger.kernel.org
Subject: Re: [PATCH v4 0/8] coresight: Fix device registration and unregistration
Date: Tue, 24 Feb 2026 11:06:59 +0000 [thread overview]
Message-ID: <20260224110659.GA4184494@e132581.arm.com> (raw)
In-Reply-To: <ad38ffc4-eb0b-4430-8d5e-898a2e66977b@arm.com>
On Mon, Feb 23, 2026 at 01:28:03PM +0000, Suzuki K Poulose wrote:
[...]
> [ 827.216924] Possible unsafe locking scenario:
> [ 827.216924]
> [ 827.222849] CPU0 CPU1
> [ 827.227380] ---- ----
> [ 827.231912] lock(coresight_mutex);
> [ 827.235491] lock(ect_mutex);
> [ 827.241073] lock(coresight_mutex);
> [ 827.247176] lock(ect_mutex);
> [ 827.250233]
> [ 827.250233] *** DEADLOCK ***
Thanks for the test, Suzuki.
I have sent a refactor patch to dismiss locking chain:
https://lore.kernel.org/linux-arm-kernel/20260224-arm_coresight_refactor_cti_resource_release-v1-1-ff1b2bca9176@arm.com/T/#u
For recording, I enabled the following configs to reproduce the lockdep
report:
CONFIG_LOCKUP_DETECTOR
CONFIG_PROVE_LOCKING
Thanks,
Leo
next prev parent reply other threads:[~2026-02-24 11:07 UTC|newest]
Thread overview: 14+ messages / expand[flat|nested] mbox.gz Atom feed top
2026-02-09 12:44 [PATCH v4 0/8] coresight: Fix device registration and unregistration Leo Yan
2026-02-09 12:44 ` [PATCH v4 1/8] coresight: Fix memory leak in coresight_alloc_device_name() Leo Yan
2026-02-09 12:44 ` [PATCH v4 2/8] coresight: Get parent device reference after sink ID map allocation Leo Yan
2026-02-09 12:44 ` [PATCH v4 3/8] coresight: Protect unregistration with mutex Leo Yan
2026-02-09 12:44 ` [PATCH v4 4/8] coresight: Refactor output connection sysfs link cleanup Leo Yan
2026-02-09 12:44 ` [PATCH v4 5/8] coresight: Refactor sysfs connection group cleanup Leo Yan
2026-02-09 12:44 ` [PATCH v4 6/8] coresight: Move sink validation into etm_perf_add_symlink_sink() Leo Yan
2026-02-09 12:44 ` [PATCH v4 7/8] coresight: Do not mix success path with failure handling Leo Yan
2026-02-09 12:44 ` [PATCH v4 8/8] coresight: Unify bus unregistration via coresight_unregister() Leo Yan
2026-02-17 14:51 ` James Clark
2026-02-23 13:28 ` [PATCH v4 0/8] coresight: Fix device registration and unregistration Suzuki K Poulose
2026-02-24 11:06 ` Leo Yan [this message]
2026-02-24 11:16 ` Suzuki K Poulose
2026-02-25 14:29 ` Suzuki K Poulose
Reply instructions:
You may reply publicly to this message via plain-text email
using any one of the following methods:
* Save the following mbox file, import it into your mail client,
and reply-to-all from there: mbox
Avoid top-posting and favor interleaved quoting:
https://en.wikipedia.org/wiki/Posting_style#Interleaved_style
* Reply using the --to, --cc, and --in-reply-to
switches of git-send-email(1):
git send-email \
--in-reply-to=20260224110659.GA4184494@e132581.arm.com \
--to=leo.yan@arm.com \
--cc=alexander.shishkin@linux.intel.com \
--cc=coresight@lists.linaro.org \
--cc=gregkh@linuxfoundation.org \
--cc=james.clark@linaro.org \
--cc=linux-arm-kernel@lists.infradead.org \
--cc=linux-kernel@vger.kernel.org \
--cc=mathieu.poirier@linaro.org \
--cc=mike.leach@arm.com \
--cc=quic_jinlmao@quicinc.com \
--cc=suzuki.poulose@arm.com \
/path/to/YOUR_REPLY
https://kernel.org/pub/software/scm/git/docs/git-send-email.html
* If your mail client supports setting the In-Reply-To header
via mailto: links, try the mailto: link
Be sure your reply has a Subject: header at the top and a blank line
before the message body.
This is a public inbox, see mirroring instructions
for how to clone and mirror all data and code used for this inbox