CVE-2024-27002 — clk: mediatek: Do a runtime PM get on controllers during probe

Affected: Linux

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

clk: mediatek: Do a runtime PM get on controllers during probe

mt8183-mfgcfg has a mutual dependency with genpd during the probing stage, which leads to a deadlock in the following call stack:

CPU0: genpd_lock --> clk_prepare_lock genpd_power_off_work_fn() genpd_lock() generic_pm_domain::power_off() clk_unprepare() clk_prepare_lock()

CPU1: clk_prepare_lock --> genpd_lock clk_register() __clk_core_init() clk_prepare_lock() clk_pm_runtime_get() genpd_lock()

Do a runtime PM get at the probe function to make sure clk_register() won't acquire the genpd lock. Instead of only modifying mt8183-mfgcfg, do this on all mediatek clock controller probings because we don't believe this would cause any regression.

Verified on MT8183 and MT8192 Chromebooks.

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CVE-2024-27002 — clk: mediatek: Do a runtime PM get on controllers during probe