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Prevent input fences from being installed on zero batch execs or zero binds, which were originally added to support queue idling in Mesa via output fences. Although input fence support was introduced for interface consistency, it leads to incorrect behavior due to chained composite fences, which are disallowed. Avoid the complexity of fixing this by removing support, as input fences for these cases are not used in practice. Signed-off-by: Matthew Brost <matthew.brost@intel.com> Reviewed-by: Thomas Hellström <thomas.hellstrom@linux.intel.com> Link: https://patch.msgid.link/20251031234050.3043507-6-matthew.brost@intel.com