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    SubjectRe: [PATCH -rt] Buggy uart (for 2.6.16)
    Steven Rostedt wrote:

    >I've noticed that you dropped my "buggy uart" patch. Probably because
    >the 2.6.14 version would cause a deadlock on 2.6.16. I've sent you a
    >new update, but it must have been lost in all the noise. Here's the
    >patch again. If you don't think this is a bug, try running the attached
    >program on the machine that deadlocked (it is the one with the buggy
    >uart). Without the patch, the serial_test will miss a wake up, and then
    >be stuck in the sleeping TASK_INTERRUPTIBLE state (at least you can
    >still kill it). With the patch, it runs fine.
    >I ran the program with the following parameters:
    ># ./serial_test /dev/ttyS0 115200 8 0 0 4
    >(Disclaimer: I did not write this serial_test. It was hacked up by my
    >customer to show me that this bug exists).
    >This may also be a bug with the vanilla kernel, since I don't see why it
    >is not. I'll run more tests on the vanilla kernel, and if it too misses
    >a wake up, I'll submit this to vanilla as well.
    >Some 8250 uarts don't zero out the NO_INTERRUPT bit of the IIR register
    Can you name the exact 8250 model which is buggy ?

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      Last update: 2006-04-10 19:08    [W:0.025 / U:7.900 seconds]
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