Messages in this thread | | | Date | Mon, 10 Apr 2006 18:53:04 +0200 | From | Gunther Mayer <> | Subject | Re: [PATCH -rt] Buggy uart (for 2.6.16) |
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Steven Rostedt wrote:
>Ingo, > >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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