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[WHY] 0, original pstate X 1, ctx_A_create -> ctx_A->stable_pstate = X 2, ctx_A_set_pstate (Y) -> current pstate is Y (PEAK or STANDARD) 3, ctx_B_create -> ctx_B->stable_pstate = Y 4, ctx_A_destroy -> restore pstate to X 5, ctx_B_destroy -> restore pstate to Y Above sequence will cause final pstate is wrong (Y), should be original X. [HOW] When ctx_B create, if ctx_A touched pstate setting (not auto, stable_pstate_ctx != NULL), set ctx_B->stable_pstate the same value as ctx_A saved, if stable_pstate_ctx == NULL, fetch current pstate to fill ctx_B->stable_pstate. Signed-off-by: Chengming Gui <Jack.Gui@amd.com> Reviewed-by: Alex Deucher <alexander.deucher@amd.com> Signed-off-by: Alex Deucher <alexander.deucher@amd.com> Cc: stable@vger.kernel.org |
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