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Only one session/channel combination may be in use at any one time. However, the failure does not occur until the tty is opened (in rfcomm_dlc_open()). Because these settings are actually bound at rfcomm device creation (via RFCOMMCREATEDEV ioctl), validate and fail before creating the rfcomm tty device. Signed-off-by: Peter Hurley <peter@hurleysoftware.com> Tested-By: Alexander Holler <holler@ahsoftware.de> Signed-off-by: Marcel Holtmann <marcel@holtmann.org>