regcache: extract __regcache_sync() to deduplicate sync dispatch

regcache_sync() and regcache_sync_region() both open-code the same
pattern: check cache_dirty, then dispatch to either cache_ops->sync()
or regcache_default_sync().

Extract this into a static __regcache_sync() helper that both callers
share. The helper checks cache_dirty and returns 0 early when the
cache is clean, dispatches to the backend sync callback when present,
and falls back to regcache_default_sync() otherwise.

In regcache_sync_region(), the cache_dirty early-exit previously
skipped setting map->async. With the helper, map->async is set to
true before the call and restored to false unconditionally afterward,
so when cache_dirty is false the flag is toggled and immediately
restored - functionally equivalent.

No functional change.

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

0 files changed, 0 insertions, 0 deletions