• Greg Kroah-Hartman's avatar
    USB: serial: make minor allocation dynamic · e5b1e206
    Greg Kroah-Hartman authored
    This moves the allocation of minor device numbers from a static array to
    be dynamic, using the idr interface.  This means that you could
    potentially get "gaps" in a minor number range for a single USB serial
    device with multiple ports, but all should still work properly.
    
    We remove the 'minor' field from the usb_serial structure, as it no
    longer makes any sense for it (use the field in the usb_serial_port
    structure if you really want to know this number), and take the fact
    that we were overloading a number in this field to determine if we had
    initialized the minor numbers or not, and just use a flag variable
    instead.
    
    Note, we still have the limitation of 255 USB to serial devices in the
    system, as that is all we are registering with the TTY layer at this
    point in time.
    Tested-by: default avatarTobias Winter <tobias@linuxdingsda.de>
    Reviewed-by: default avatarJohan Hovold <jhovold@gmail.com>
    Signed-off-by: default avatarGreg Kroah-Hartman <gregkh@linuxfoundation.org>
    e5b1e206
usb_wwan.c 17.5 KB