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acpi-cpufreq: Skip initializtion if a cpufreq driver exists

Mark Langsdorf requested to merge mlangsdorf/centos-stream-9:bz2028238 into main

Bugzilla: https://bugzilla.redhat.com/show_bug.cgi?id=2028238

Return -EBUSY when attempting to reload a module in the BUSY state. This should prevent systemd from repeatedly attempting to reload multiple instances of the same driver. Specifically, this should speed up boot times on large multi-core Intel systems where the intel_pstate driver is available but acpi_cpufreq would also be an option.

Signed-off-by: Mark Langsdorf mlangsdo@redhat.com

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