[lkml]   [2003]   [Feb]   [5]   [last100]   RSS Feed
Views: [wrap][no wrap]   [headers]  [forward] 
Messages in this thread
    SubjectRe: 2.4.21-pre4: PDC ide driver problems with shared interrupts
    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


    To unsubscribe from this list: send the line "unsubscribe linux-kernel" in
    the body of a message to
    More majordomo info at
    Please read the FAQ at

     \ /
      Last update: 2005-03-22 13:32    [W:0.018 / U:41.700 seconds]
    ©2003-2016 Jasper Spaans. hosted at Digital OceanAdvertise on this site