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    SubjectRe: TTY loosing data with u_serial gadget

    (please don't top-post)

    On Fri, Mar 18, 2011 at 05:35:56PM +0100, Stefan Bigler wrote:
    > Thanks for your quick answer. Meanwhile we ported our board to 2.6.38.
    > We recognize the same problem again.
    > I had also a look at the relevant fixes, a lot is done but I could not find
    > the required protection of the attribute receive_room.
    > I added a printk in case of failure were receive_room shows more
    > space that is really available in the queue and also used.
    > The printk is attached below and also the log.
    > Regards
    > Stefan
    > Log:
    > flush_to_ldisc, receive_room to small count=201, receive_room=287,
    > real_room=0
    > flush_to_ldisc, receive_room to small count=225, receive_room=1031,
    > real_room=0
    > flush_to_ldisc, receive_room to small count=33, receive_room=4095,
    > real_room=0

    I had the same problem while I was working at Nokia developing the N900.
    I even sent a patch (twice) with Alan Cox on the loop but nothing has
    happened. The patch might still be floating on the archives but
    essentially it would make ->receive_buf() return the amount of received
    bytes (as IMHO it should be done).


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