cppc_cpufreq_update_perf_limits() reads policy->min and policy->max
without holding the policy lock. The cpufreq core updates those fields
with separate stores, so a reader can observe the old minimum together
with the new maximum and construct MIN_PERF greater than MAX_PERF.
Read both fields once and, if the lockless snapshot is inconsistent,
reduce the minimum to the observed maximum. This matches the conservative
correction used by cpufreq_driver_resolve_freq() and ensures that CPPC
never receives an inverted limit pair.
Fixes: ea3db45ae4 ("cpufreq: cppc: Update MIN_PERF/MAX_PERF in target callbacks")
Cc: stable@vger.kernel.org
Signed-off-by: Christian Loehle <christian.loehle@arm.com>
Link: https://patch.msgid.link/20260722093825.1030594-3-christian.loehle@arm.com
Signed-off-by: Rafael J. Wysocki <rafael.j.wysocki@intel.com>
9753c0ab89