ASoC: cs35l33: drain threaded IRQ before runtime suspend

cs35l33_runtime_suspend() currently switches the codec into
regcache_cache_only(true) and powers it down without first quiescing the
threaded IRQ registered by devm_request_threaded_irq(). That leaves a
window where cs35l33_irq_thread() can still run after suspend has closed
off live register access.

A running system can reach this during runtime PM while the driver still
has critical fault IRQs unmasked. If the threaded handler runs in that
window, it reads volatile INT_STATUS_1/2 after cache_only has been
enabled, ignores the regmap_read() failures, and can still drive the
AMP_SHORT_RLS, CAL_ERR_RLS, OTE_RLS, and OTW_RLS release paths.

Use disable_irq() before entering cache_only/power-off so any in-flight
threaded handler is drained and no new IRQ thread can run during the
suspended state. Re-enable the IRQ only after runtime_resume() has
restored live register access with regcache_sync(). Since probe only
warns if devm_request_threaded_irq() fails, track whether the IRQ was
actually installed before disabling or re-enabling it.

Fixes: 3333cb7187b9 ("ASoC: cs35l33: Initial commit of the cs35l33 CODEC driver.")
Cc: stable@vger.kernel.org
Signed-off-by: Runyu Xiao <runyu.xiao@seu.edu.cn>
Link: https://patch.msgid.link/20260611161553.3378721-2-runyu.xiao@seu.edu.cn
Signed-off-by: Mark Brown <broonie@kernel.org>

0 files changed, 0 insertions, 0 deletions