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    SubjectRe: [PATCH 4/6] drivers:misc: sources for Init manager module
    --- On Wed, 24/3/10, Alan Cox <> wrote:

    > From: Alan Cox <>
    > Subject: Re: [PATCH 4/6] drivers:misc: sources for Init manager module
    > To: "Pavan Savoy" <>
    > Cc: "Marcel Holtmann" <>, "Greg KH" <>, "PavanSavoy" <>, "" <>
    > Date: Wednesday, 24 March, 2010, 10:33 PM
    > Ok I had a brief dig
    > Making a driver able to say "and open me in this ldisc" is
    > about ten
    > lines of code to the core tty layer if that.
    > There is one caveat - the actual ldisc attach method for an
    > ldisc attach
    > isn't allowed to fail the attach. That's something we
    > eventually need to
    > fix anyway.
    > Otherwise it doesn't look too scary and it would occur when
    > the user
    > opened the file not when the device was created.

    So as I understand the user-space application/daemon should do an open on the TTY and then do nothing ?
    Somewhere down the line, the driver may do a tty_set_ldisc, and use it the way it wants to ?

    Isn't there a mechanism for the tty_set_ldisc to do what _open does ?
    I mean there might be plenty of devices on UART which might not need /dev/tty at all ? i.e An App need not open for a ldisc to be installed.

    > Alan

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