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    SubjectRe: Very strange data loss with jsm driver
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    On Fri, Jul 29, 2011 at 12:53:42PM -0400, Lennart Sorensen wrote:
    > On Fri, Jul 29, 2011 at 05:27:36PM +0100, Alan Cox wrote:
    > > > The trigger point appears to be lines of up to 14 bytes, followed by
    > > > a newline. With 15 bytes or more per line it seems to be OK.
    > > >
    > > > Anyone got a clue?
    > >
    > > FIFO size perhaps - and some kind of missed wakeup or tx handling bug ?
    >
    > FIFO size is 64bytes, so that doesn't immediately sound related.
    >
    > The thing I find weird is that it thinks everything was sent right away.
    >
    > Also why should the newline have anything to do with it? If you send
    > 100100 bytes should it matter where the newlines are unless the tty
    > layer or the driver is interpreting the newlines for some reason.

    Same breakage on 2.6.18. I suspect this has always been broken.

    Hmm.

    I noticed fifosize in the uart_port info is set to 16, even though the
    fifo size is actually 64 bytes as all actual driver bits know. What is
    fifosize actually used for?

    --
    Len Sorensen


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