From: Mathieu Poirier <mathieu.poirier@linaro.org>
To: Mike Leach <mike.leach@linaro.org>
Cc: linux-arm-kernel@lists.infradead.org, coresight@lists.linaro.org,
suzuki.poulose@arm.com, leo.yan@linaro.org
Subject: Re: [PATCH v5 0/2] Fix lockdep issues seen in CoreSight configfs interface
Date: Wed, 29 Jun 2022 09:42:21 -0600 [thread overview]
Message-ID: <20220629154221.GA2013207@p14s> (raw)
In-Reply-To: <20220628173004.30002-1-mike.leach@linaro.org>
On Tue, Jun 28, 2022 at 06:30:02PM +0100, Mike Leach wrote:
> Issues with lockdep possible deadlock scenarios have been reported when using the
> coresight configfs interface handling complex configuration, when unloading modules.
>
> These are due to holding the main configuration mutex during configfs register, but
> taking it later when accessing configfs files.
>
> The patches improve the clean up of configurations and update load and unload of
> configurations and initialisation of configfs to fix the locking mechanisms.
>
> Applies to coresight/next (5.19-rc2)
> Tested on DB410c (with patch [0] also applied to fix separate console boot issue).
>
> Fixes: eb2ec49606c2 ("coresight: syscfg: Update load API for config loadable modules")
> Reported-by: Suzuki Poulose <suzuki.poulose@arm.com>
> Signed-off-by: Mike Leach <mike.leach@linaro.org>
>
Applied.
Thanks,
Mathieu
> [0] https://lkml.kernel.org/r/20220614124618.2830569-1-suzuki.poulose@arm.com
>
> Changes since v4:
> No functional change - fixed comment in patch header 1/2 and error string format to
> remove checkpatch warning as requested by Mathieu.
>
> Changes since v3:
> Addressed minor issues raised by Suzuki.
>
> Changes since v2:
> Added additional work to fix load and unload ops after issue recurred
> due to file access.
>
> Mike Leach (2):
> coresight: configfs: Fix unload of configurations on module exit
> coresight: syscfg: Update load and unload operations
>
> .../hwtracing/coresight/coresight-config.h | 2 +
> .../hwtracing/coresight/coresight-syscfg.c | 298 +++++++++++++++---
> .../hwtracing/coresight/coresight-syscfg.h | 13 +
> 3 files changed, 261 insertions(+), 52 deletions(-)
>
> --
> 2.17.1
>
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prev parent reply other threads:[~2022-06-29 15:43 UTC|newest]
Thread overview: 4+ messages / expand[flat|nested] mbox.gz Atom feed top
2022-06-28 17:30 [PATCH v5 0/2] Fix lockdep issues seen in CoreSight configfs interface Mike Leach
2022-06-28 17:30 ` [PATCH v5 1/2] coresight: configfs: Fix unload of configurations on module exit Mike Leach
2022-06-28 17:30 ` [PATCH v5 2/2] coresight: syscfg: Update load and unload operations Mike Leach
2022-06-29 15:42 ` Mathieu Poirier [this message]
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