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If we get a msg.reply of REPLY_DEFER, we also get an err of 0 so we fail reads with 0 < size and return -EPROTO instead of trying again. v2: same fix in i2c code. Found writing MST support. Reviewed-by: Jani Nikula <jani.nikula@intel.com> Reviewed-by: Thierry Reding <treding@nvidia.com> Signed-off-by: Dave Airlie <airlied@redhat.com>