[PATCH v2 0/3] debugfs: make debugfs_create_str() read-only

debugfs_create_str() currently supports writable files through a generic
string replacement helper.  Concurrent writers can race in that helper.

Instead of adding more locking to the generic debugfs string code, convert
the existing writable in-tree users to local file operations first, then make
debugfs_create_str() read-only and refuse modes with write permission bits.

Changes since v1:
- Follow Greg's suggestion to avoid adding locking to the generic
  debugfs_create_str() write path.
- Convert the existing writable in-tree users to local file operations.
- Make debugfs_create_str() read-only and refuse writable modes.
- Split the change into a 3-patch series.

Yichong Chen (3):
  interconnect: debugfs: replace writable string helper
  soundwire: debugfs: replace writable string helper
  debugfs: make debugfs_create_str() read-only

 drivers/interconnect/debugfs-client.c | 75 ++++++++++++++++++++-----
 drivers/soundwire/debugfs.c           | 56 ++++++++++++++++--
 fs/debugfs/file.c                     | 81 ++++-----------------------
 3 files changed, 124 insertions(+), 88 deletions(-)

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2.51.0