linux-kernel - [PATCH v2 0/3] coresight: cti: Add PM runtime call in enable

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Message-Id: <20230106152331.1374973-1-james.clark@arm.com>
Date:   Fri,  6 Jan 2023 15:23:27 +0000
From:   James Clark <james.clark@....com>
To:     coresight@...ts.linaro.org, quic_jinlmao@...cinc.com,
        suzuki.poulose@....com, mike.leach@...aro.org
Cc:     James Clark <james.clark@....com>,
        Mathieu Poirier <mathieu.poirier@...aro.org>,
        Leo Yan <leo.yan@...aro.org>,
        Alexander Shishkin <alexander.shishkin@...ux.intel.com>,
        Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
        linux-arm-kernel@...ts.infradead.org, linux-kernel@...r.kernel.org
Subject: [PATCH v2 0/3] coresight: cti: Add PM runtime call in enable_store

This should be a slight improvement on Jinlong's previous version.
Now it's not possible to trigger the error message from
pm_runtime_put() by calling disable twice.

It's also similar to the original pre-breaking change version where
pm_runtime_put() was only called if the device was actually disabled,
but with one difference: Previously pm_runtime_put() was only called
once for the last disable call, but because of the reference counting
in pm_runtime, it should have been called once for each enable call.
This meant that the clock would have never been disabled if there were
ever multiple enable calls. This is now fixed.

The third commit is a refactor and doesn't need to be backported. I
removed one of the atomic types because it didn't appear to be
required. Maybe it was added for a reason which I'm not aware of, if
so it should be pretty easy to drop that change.

James Clark (2):
  coresight: cti: Prevent negative values of enable count
  coresight: cti: Remove atomic type from enable_req_count

Mao Jinlong (1):
  coresight: cti: Add PM runtime call in enable_store

 .../hwtracing/coresight/coresight-cti-core.c  | 23 ++++++++++++-------
 .../hwtracing/coresight/coresight-cti-sysfs.c | 15 +++++++++---
 drivers/hwtracing/coresight/coresight-cti.h   |  2 +-
 3 files changed, 28 insertions(+), 12 deletions(-)

base-commit: c767c34740132ffc478226864a7461493cdc2413
-- 
2.25.1