cpufreq: intel_pstate: Refuse to turn off with HWP enabled
[ Upstream commit43298db300
] After commitf6ebbcf08f
("cpufreq: intel_pstate: Implement passive mode with HWP enabled") it is possible to change the driver status to "off" via sysfs with HWP enabled, which effectively causes the driver to unregister itself, but HWP remains active and it forces the minimum performance, so even if another cpufreq driver is loaded, it will not be able to control the CPU frequency. For this reason, make the driver refuse to change the status to "off" with HWP enabled. Signed-off-by: Rafael J. Wysocki <rafael.j.wysocki@intel.com> Acked-by: Srinivas Pandruvada <srinivas.pandruvada@linux.intel.com> Signed-off-by: Sasha Levin <sashal@kernel.org>
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@ -2533,9 +2533,15 @@ static int intel_pstate_update_status(const char *buf, size_t size)
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{
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int ret;
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if (size == 3 && !strncmp(buf, "off", size))
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return intel_pstate_driver ?
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intel_pstate_unregister_driver() : -EINVAL;
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if (size == 3 && !strncmp(buf, "off", size)) {
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if (!intel_pstate_driver)
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return -EINVAL;
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if (hwp_active)
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return -EBUSY;
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return intel_pstate_unregister_driver();
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}
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if (size == 6 && !strncmp(buf, "active", size)) {
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if (intel_pstate_driver) {
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