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    SubjectRe: [PATCH -rt] buggy UART fix
    On Tue, 2006-02-28 at 21:40 +0100, Ingo Molnar wrote:
    > hm, i just got the deadlock below, most likely due to your serial fix.
    > (never got this before) It's not 100% reproducible - booted the kernel a
    > dozen times (with your patch applied, working on other stuff) before i
    > got this deadlock.

    The original patch grabs the port.lock and then
    calls serial8250_handle_port() which grabs the lock
    again. Just remove the spin_lock/spin_unlock below.

    + /*
    + * If we have a buggy TX line, that doesn't
    + * notify us via iir that we need to transmit
    + * then force the call.
    + */
    + if (!handled && (up->bugs & UART_BUG_TXEN)) {
    + spin_lock(&up->port.lock);
    + serial8250_handle_port(up, regs);
    + spin_unlock(&up->port.lock);
    + }

    Paul Fulghum
    Microgate Systems, Ltd

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      Last update: 2006-02-28 22:29    [W:0.045 / U:4.796 seconds]
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