CVE-2026-89946ASoC: cs35l33: drain threaded IRQ before runtime suspend

Official description

In the Linux kernel, the following vulnerability has been resolved: 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.

Affected packages & fixed versions

Affected products (as reported)

References

• https://git.kernel.org/stable/c/d07799302721d381aef834fac8a11d196894eccb
• https://git.kernel.org/stable/c/5b5311427e54d9c0d07178ee42df68ba44c2d5ca
• https://git.kernel.org/stable/c/a04722542c76ce861031384480825afded8cc4f4
• https://git.kernel.org/stable/c/614c2616ea677abfbed917a92bdc5141efff3536
• https://git.kernel.org/stable/c/6ae98918240585eb2ad32b097c4810f4e2dabe88
• https://git.kernel.org/stable/c/6e369bc46663b4bfce3d5f8b8ed08e71ecea13a2
• https://git.kernel.org/stable/c/84cf6acd01a1ec8f30276578a039216327af782e
• https://git.kernel.org/stable/c/e074c12c428c633e079154301207a6079a208583