regcache: extract locked helpers to replace open-coded lock/unlock pairs

The previous patch ("regcache: use the regmap scoped lock guard")
deliberately left regcache_init() with explicit map->lock()/unlock()
calls because the function has a goto err_* cleanup ladder and mixing
goto with cleanup helpers in the same function is discouraged by
cleanup.h.

Solve this by extracting two static helpers:

  regcache_locked_op()  - acquires the regmap lock via guard(regmap),
                          invokes an int-returning cache_ops callback
                          (init, populate), and returns its result.
                          Returns 0 when the callback is NULL.

  regcache_locked_exit() - acquires the regmap lock via guard(regmap)
                           and invokes the void-returning exit
                           callback.  Returns immediately when the
                           callback is NULL.

Because the lock scope is now entirely inside the helper functions,
it never crosses a goto target in the caller, so the cleanup.h
concern does not apply.

Convert all four remaining open-coded lock/unlock sites in
regcache_init() (init, populate, error-path exit) and the
scoped_guard in regcache_exit() to use these helpers.

No functional change.

Assisted-by: LLM
Signed-off-by: Peng Fan <peng.fan@nxp.com>
Link: https://patch.msgid.link/20261002-regmap-lock-2nd-v2-1-e172b0501c52@nxp.com
Signed-off-by: Mark Brown <broonie@kernel.org>

0 files changed, 0 insertions, 0 deletions