Albert Lee wrote: > Hi Bart, > >>Albert Lee wrote: >> >> >>>Problem: IDE ATAPI DMA lost irq with CDB intr devices on Intel ICHx >>>machines. >>> >>>This patch clears the INTR and ERROR bits of DMA status before starting >>>BMDMA to fix the problem. >> >> >>[PATCH] ide-cd: Handle strange interrupt on the Intel ESB2 >>http://lkml.org/lkml/2006/12/4/201 >> >>The above patch was already merged so it seems that the list >>of PCI IDs requiring ->atapi_irq_bogon needs to be expanded... > > > Instead of adding PCI IDs to the blacklist, could we just unconditionally > clear the dma_status:INTR in ide_dma_start()? > Sorry I did not read through the ICH7 irq storm problem well. It seems clearing dma_status:INTR in ide_dma_start() is only good for 1. Spurious interrupt problem (http://lkml.org/lkml/2006/12/4/201) and 2. This CDB intr device + ICHx irq lost problem (http://www.mail-archive.com/linux-ide@xxxxxxxxxxxxxxx/msg02934.html) But it does not fix 3. ICH7 native mode irq storm problem (http://lkml.org/lkml/2006/11/15/94). Maybe we should clearing the INTR in the interrupt handler, no matter it is DMA/PIO/ATA/ATAPI, just like what libata does. Will check ide_intr() to see if we can clear the bmdma_status:INTR there. -- albert - To unsubscribe from this list: send the line "unsubscribe linux-ide" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html
