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Currently the function heap allocates when we have any payload. Where in many case the payload is 1 byte - ouch. >From casual observation, vast majority of the payloads are smaller than 8 bytes - so use a stack array tx[8] to avoid the senseless kmalloc and kfree dance. Cc: Jani Nikula <jani.nikula@intel.com> Cc: Thierry Reding <treding@nvidia.com> Signed-off-by: Emil Velikov <emil.velikov@collabora.com> Reviewed-by: Thierry Reding <treding@nvidia.com> Signed-off-by: Sam Ravnborg <sam@ravnborg.org> Link: https://patchwork.freedesktop.org/patch/msgid/20200505160329.2976059-1-emil.l.velikov@gmail.com