Add validity checks for the dmc ids computed from pipe parameters in intel_dmc_enable_pipe() and intel_dmc_disable_pipe(). It's slightly difficult for humans and static analyzers alike to ensure the resulting dmc ids are within bounds. Just check them and reject invalid ones.
Signed-off-by: Jani Nikula <[email protected]> --- drivers/gpu/drm/i915/display/intel_dmc.c | 8 ++++++-- 1 file changed, 6 insertions(+), 2 deletions(-) diff --git a/drivers/gpu/drm/i915/display/intel_dmc.c b/drivers/gpu/drm/i915/display/intel_dmc.c index ab0ad8e3e620..3b8e8193d042 100644 --- a/drivers/gpu/drm/i915/display/intel_dmc.c +++ b/drivers/gpu/drm/i915/display/intel_dmc.c @@ -415,7 +415,9 @@ static void pipedmc_clock_gating_wa(struct drm_i915_private *i915, bool enable) void intel_dmc_enable_pipe(struct drm_i915_private *i915, enum pipe pipe) { - if (!has_dmc_id_fw(i915, PIPE_TO_DMC_ID(pipe))) + enum intel_dmc_id dmc_id = PIPE_TO_DMC_ID(pipe); + + if (!is_valid_dmc_id(dmc_id) || !has_dmc_id_fw(i915, dmc_id)) return; if (DISPLAY_VER(i915) >= 14) @@ -426,7 +428,9 @@ void intel_dmc_enable_pipe(struct drm_i915_private *i915, enum pipe pipe) void intel_dmc_disable_pipe(struct drm_i915_private *i915, enum pipe pipe) { - if (!has_dmc_id_fw(i915, PIPE_TO_DMC_ID(pipe))) + enum intel_dmc_id dmc_id = PIPE_TO_DMC_ID(pipe); + + if (!is_valid_dmc_id(dmc_id) || !has_dmc_id_fw(i915, dmc_id)) return; if (DISPLAY_VER(i915) >= 14) -- 2.34.1
