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If the doorbell failed to ring we return -EIO, but the caller can't determine why it failed. Pass the reason for the failure in an argument for caller to investigate. Suggested-by: Mark Hasemeyer <markhas@chromium.org> Signed-off-by: Mario Limonciello <mario.limonciello@amd.com> Reviewed-by: Mark Hasemeyer <markhas@chromium.org> Tested-by: Mark Hasemeyer <markhas@chromium.org> Signed-off-by: Herbert Xu <herbert@gondor.apana.org.au>