On Fri, 2006-11-03 at 09:54 -0600, Mike Miller (OS Dev) wrote:
> PATCH 5 of 8 resend
>
> This patch unconditionally disables DMA prefetch on the P600 controller. A
> bug in the ASIC may result in prefetching either beyond the end of memory
> or to fall off into a memory hole.
> Please consider this for inclusion.
>
> Thanks,
> mikem
>
> Signed-off-by: Mike Miller <mike.miller@xxxxxx>
>
> cciss.c | 13 +++++++++++++
> cciss_cmd.h | 1 +
> 2 files changed, 14 insertions(+)
> --------------------------------------------------------------------------------
> diff -urNp linux-2.6-p00004/drivers/block/cciss.c linux-2.6-p00005/drivers/block/cciss.c
> --- linux-2.6-p00004/drivers/block/cciss.c 2006-10-31 15:20:25.000000000 -0600
> +++ linux-2.6-p00005/drivers/block/cciss.c 2006-11-03 09:43:55.000000000 -0600
> @@ -2997,6 +2997,19 @@ static int cciss_pci_init(ctlr_info_t *c
> }
> #endif
>
> + {
> + /* Disabling DMA prefetch for the P600
> + * An ASIC bug may result in a prefetch beyond
> + * physical memory.
> + */
> + __u32 dma_prefetch
> + if(board_id == 0x3225103C) {
> + dma_prefetch = readl(c->vaddr + I2O_DMA1_CFG);
> + dma_prefetch |= 0x8000;
> + writel(dma_prefetch, c->vaddr + I2O_DMA1_CFG);
> + }
> + }
> +
if you remove the if() you might as well also remove the {}'s ;)
--
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