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| author | Rafael J. Wysocki <rafael.j.wysocki@intel.com> | 2017-06-05 14:51:18 +0200 |
|---|---|---|
| committer | Rafael J. Wysocki <rafael.j.wysocki@intel.com> | 2017-06-05 14:51:18 +0200 |
| commit | 57caf4ec2b8bfbcb4f738ab5a12eedf3a8786045 (patch) | |
| tree | 19d5662b5b54fe439eeb62520f021ff71eabf30d /kernel/power | |
| parent | cpufreq: intel_pstate: Document the current behavior and user interface (diff) | |
| download | linux-57caf4ec2b8bfbcb4f738ab5a12eedf3a8786045.tar.xz linux-57caf4ec2b8bfbcb4f738ab5a12eedf3a8786045.zip | |
cpufreq: intel_pstate: Avoid division by 0 in min_perf_pct_min()
Commit c5a2ee7dde89 (cpufreq: intel_pstate: Active mode P-state
limits rework) incorrectly assumed that pstate.turbo_pstate would
always be nonzero for CPU0 in min_perf_pct_min() if
cpufreq_register_driver() had succeeded which may not be the case
in virtualized environments.
If that assumption doesn't hold, it leads to an early crash on boot
in intel_pstate_register_driver(), so add a sanity check to
min_perf_pct_min() to prevent the crash from happening.
Fixes: c5a2ee7dde89 (cpufreq: intel_pstate: Active mode P-state limits rework)
Reported-and-tested-by: Jongman Heo <jongman.heo@samsung.com>
Signed-off-by: Rafael J. Wysocki <rafael.j.wysocki@intel.com>
Diffstat (limited to 'kernel/power')
0 files changed, 0 insertions, 0 deletions