Messages in this thread | | | Date | Wed, 05 Feb 2003 08:56:35 -0800 | From | Ross Biro <> | Subject | Re: 2.4.21-pre4: PDC ide driver problems with shared interrupts |
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Benjamin Herrenschmidt wrote:
>>Okay, I had to watch for it a bit longer and it turns out that the kernel PDC driver has a problem in this shared interrupt setup. When loads get high it seems to run into some timing problem which causes things like: >> >>Feb 4 01:02:22 admin kernel: hde: dma_intr: status=0xd0 { Busy } >> >> >> Since the busy bit is set, we know the drive must have received a command. Since dma_intr thought the drive was not busy, an interrupt must have snuck through between the command being issued and the dma being started. I think in my original patch, I had the dma start outside of the spinlock, that is a bug. The command to the controller to start the dma must be inside of the spinlock.
I have not looked at 2.4.21-pre4 at all, so I could be entirely off base here.
Ross
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