drm/i915/display: check configuration index before shifting

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The calc_allowed_config_filter() function passes the return value of
iter_pos_to_idx() directly to BIT(), but the helper can return -1 for
an invalid iterator.

The iterator already rejects negative indices before doing a
configuration, so this should not matter in normal flows.  In any
case, for robustness, check the index explicitly and warn if it is
negative, avoiding an undefined shift.

Fixes: 39e30bdf2f ("drm/i915/dp_link_caps: Add link configuration iterator")
Reviewed-by: Imre Deak <imre.deak@intel.com>
Link: https://patch.msgid.link/20260908100659.113555-1-luciano.coelho@intel.com
Signed-off-by: Luca Coelho <luciano.coelho@intel.com>
(cherry picked from commit fe05cb9b9f)
Signed-off-by: Jani Nikula <jani.nikula@intel.com>

...

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Luca Coelho 2026-09-08 13:06:51 +03:00 • committed by Jani Nikula

parent fd73f4a665

commit ee415ce8cb

1 changed files with 8 additions and 1 deletions

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drivers/gpu/drm/i915/display/intel_dp_link_caps.c

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