[PATCH v2 0/9] coresight: Fix assorted bugs reported by Sashiko

[James Clark]

Small fixes for bugs in the CoreSight drivers that were found by
Sashiko. Mostly reference and resource leaks on error paths, plus a
deadlock, a missing lock, and a sysfs store that should return -EBUSY
while a sysfs session is enabled.

Assisted by Claude Opus 5.5 and Sashiko

Signed-off-by: James Clark <james.clark@xxxxxxxxxx>
---
Changes in v2:
- Cherry pick "coresight: etm-perf: Serialize AUX topology access"
  into this set so that it now has no dependencies.
- Drop "coresight: cpu-debug: Fix PM usage counter leak in
  debug_enable_func()" which is fixed more generally by
  https://lore.kernel.org/linux-arm-kernel/20260911-b4-coresight-runtime-pm-failures-v1-1-acdf49756e11@xxxxxxxxxxxxxxxx/#r

- Link to v1: https://patch.msgid.link/20261027-james-cs-sashiko-easy-fixes-1-v1-0-db43c4668644@xxxxxxxxxx

---
James Clark (9):
      coresight: etm-perf: Serialize AUX topology access
      coresight: etm4x: Remove perf symlink if config registration fails
      coresight: etm4x: Fix truncation of nr_ext_inp
      coresight: etm-perf: Fix sink device reference leak in etm_setup_aux()
      coresight: syscfg: Take csdev lock when removing owned features
      coresight: syscfg: Fix deadlock in cscfg_create_device() error path
      coresight: Fix resource leaks on coresight_build_path() errors
      coresight: etm3x: Don't ignore etm_parse_event_config() errors
      coresight: etm3x: Prohibit modifying seq_curr_state while session is enabled

 drivers/hwtracing/coresight/coresight-core.c       | 26 +++++++++++++++++-----
 drivers/hwtracing/coresight/coresight-etm-perf.c   | 15 +++++++++----
 drivers/hwtracing/coresight/coresight-etm3x-core.c |  6 ++++-
 .../hwtracing/coresight/coresight-etm3x-sysfs.c    |  5 +++++
 drivers/hwtracing/coresight/coresight-etm4x-core.c |  1 +
 drivers/hwtracing/coresight/coresight-etm4x.h      |  2 +-
 drivers/hwtracing/coresight/coresight-priv.h       |  1 +
 drivers/hwtracing/coresight/coresight-syscfg.c     |  8 ++++++-
 drivers/hwtracing/coresight/coresight-sysfs.c      |  4 ++--
 9 files changed, 53 insertions(+), 15 deletions(-)
---
base-commit: 343cfcbb3ecfdb80aa576a428cfa3b65ad783842
change-id: 20261027-james-cs-sashiko-easy-fixes-1-692d80016a89

Best regards,
--  
James Clark <james.clark@xxxxxxxxxx>