[PATCH v2 0/8] coresight: Fix device registration and unregistration

[Leo Yan]

This series is to fix and refactor CoreSight device registration and
unregistration, it can be divided into three small parts:

  Patches 01-03: Three fixes for memory leak, device reference and mutex
                 protection.
  Patches 04-05: Move connection cleanup operations into
                 coresight_remove_conns().
  Patches 06-08: Refactor error handling in coresight_register().

This series is verified on Juno board with kmemleak detector.

For kmemleak verifying:

  echo clear > /sys/kernel/debug/kmemleak
  insmod coresight modules
  rmmod coresight modules
  echo scan > /sys/kernel/debug/kmemleak

The result shows no memory leak during a cycle of device registration
and unregistration.

---
Changes in v2:
- Refined the commit log in patch 06 (Suzuki).
- Unified to call coresight_unregister() for error handling (Suzuki).
- Refactor connection and sysfs group release.
- Link to v1: https://lore.kernel.org/linux-arm-kernel/20250512154108.23920-1-leo.yan@xxxxxxx/

To: Suzuki K Poulose <suzuki.poulose@xxxxxxx>
To: Mike Leach <mike.leach@xxxxxxxxxx>
To: James Clark <james.clark@xxxxxxxxxx>
To: Alexander Shishkin <alexander.shishkin@xxxxxxxxxxxxxxx>
To: Greg Kroah-Hartman <gregkh@xxxxxxxxxxxxxxxxxxx>
To: Mathieu Poirier <mathieu.poirier@xxxxxxxxxx>
To: Mao Jinlong <quic_jinlmao@xxxxxxxxxxx>
Cc: coresight@xxxxxxxxxxxxxxxx
Cc: linux-arm-kernel@xxxxxxxxxxxxxxxxxxx
Cc: linux-kernel@xxxxxxxxxxxxxxx
Signed-off-by: Leo Yan <leo.yan@xxxxxxx>

---
Leo Yan (8):
      coresight: Fix memory leak in coresight_alloc_device_name()
      coresight: Get parent device reference after sink ID map allocation
      coresight: Protect unregistration with mutex
      coresight: Refactor output connection sysfs link cleanup
      coresight: Refactor sysfs connection group cleanup
      coresight: Move sink validation into etm_perf_add_symlink_sink()
      coresight: Do not mix success path with failure handling
      coresight: Unify error handling in coresight_register()

 drivers/hwtracing/coresight/coresight-core.c     | 105 +++++++++++------------
 drivers/hwtracing/coresight/coresight-etm-perf.c |   5 +-
 drivers/hwtracing/coresight/coresight-platform.c |   2 +-
 drivers/hwtracing/coresight/coresight-priv.h     |   3 +-
 4 files changed, 56 insertions(+), 59 deletions(-)
---
base-commit: eebe8dbd8630f51cf70b1f68a440cd3d7f7a914d
change-id: 20260120-arm_coresight_refactor_dev_register-f16c069db41d

Best regards,
-- 
Leo Yan <leo.yan@xxxxxxx>