Linux Kernel cpufreq amd-pstate Driver Lock Removal Vulnerability

A vulnerability in the Linux kernel's cpufreq amd-pstate driver has been addressed by removing an unnecessary driver-wide lock in the set_boost function. This lock was not needed as set_boost is a per-policy function call. The previous implementation posed a risk of deadlock by potentially colliding with another mutex acquisition from the mode-switch path in the status_store function.

Impact

The removal of the unnecessary driver lock prevents potential deadlocks that could arise from conflicting mutex acquisitions in different parts of the driver.