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Similar to UAC1 spec, UAC2 feature unit descriptor has variable size. Current audio-v2 feature unit descriptor structure is used for parsing descriptors, but can't be used to define your own descriptor. Add a new macro similar to what audio v1 already has. Signed-off-by: Ruslan Bilovol <ruslan.bilovol@gmail.com> Signed-off-by: Pavel Hofman <pavel.hofman@ivitera.com> Link: https://lore.kernel.org/r/20210712125529.76070-2-pavel.hofman@ivitera.com Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>