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drm/radeon: fix atom aux payload size check for writes (v2)
The atom aux param interface only supports 4 bits for the total write transfer size (header + payload). This limits us to 12 bytes of payload rather than 16. Add a check for this. Reads are not affected. v2: switch to WARN_ON_ONCE Reviewed-by: Michel Dänzer <[email protected]> Signed-off-by: Alex Deucher <[email protected]>
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