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| author | Mario Limonciello <mario.limonciello@amd.com> | 2026-09-21 14:02:32 -0500 |
|---|---|---|
| committer | Mario Limonciello <superm1@kernel.org> | 2026-10-01 12:56:41 -0500 |
| commit | f6d3cbc63935fa8911da87e91ed768824d495470 (patch) | |
| tree | cacdb2d426a610ec14c317d1e7be8f602c9b8eb3 /tools/perf/scripts/python/stackcollapse.py | |
| parent | b3f9051ae263940af4a69212c88fd094401cf92d (diff) | |
cpufreq: amd-pstate: Restore previous mode when changing driver mode fails
amd_pstate_change_driver_mode() unregisters the currently active driver
before registering the requested mode. If amd_pstate_register_driver()
fails for the new mode, the function returns the error without restoring
anything, leaving the system with no cpufreq scaling driver at all until
a valid mode is manually re-selected.
Remember the mode that was active before the transition and, if
registering the requested mode fails, register the previous mode again so
the system keeps a working scaling driver. The original error is still
returned to the caller so the sysfs write reports the failure.
Reported-by: Sashiko <sashiko-bot@kernel.org>
Closes: https://sashiko.dev/#/bug/linux-5b138ddb-c88b-4f82-8a2d-f39446b625d4
Fixes: 3ca7bc818d8c ("cpufreq: amd-pstate: Add guided mode control support via sysfs")
Signed-off-by: Mario Limonciello <mario.limonciello@amd.com>
Link: https://lore.kernel.org/r/20260921190235.3651688-1-mario.limonciello@amd.com
Signed-off-by: Mario Limonciello <superm1@kernel.org>
Diffstat (limited to 'tools/perf/scripts/python/stackcollapse.py')
0 files changed, 0 insertions, 0 deletions