Re: highmem, aic7xxx, and vfat: too few segs for dma mapping

From: Steve Lord (
Date: Thu Dec 13 2001 - 15:58:31 EST

On Thu, 2001-12-13 at 14:48, Justin T. Gibbs wrote:
> >So according to this, zero.
> Thanks for the info - its the first useful report I've gotten todate. 8-)
> I believe I've found and fixed the bug. I've changed a few other things
> in the driver for the 6.2.5 release, so once I've tested them I'll release
> new patches. In the mean time, you should be able to avoid the problem by
> moving the initialization of scb->sg_count to 0 in the function:
> aic7xxx_linux.c:ahc_linux_run_device_queue()
> to before the statement:
> if (cmd->use_sg != 0) {
> I'd give you diffs, but these other changes in my tree need more testing
> before I'll feel comfortable releasing them. I also don't have a 2.5 tree
> downloaded yet to verify that the driver functions there.
> In order to reproduce the bug, you need to issue a command that uses
> all of the segments of a given transaction and then have a command with
> use_sg == 0 be the next command to use that same SCB. This explains why
> I was not able to reproduce the problem here.

Thanks, I will test it out here and let you know, looks like David
Miller is proposing the same assignment in a different place.


> --
> Justin


Steve Lord voice: +1-651-683-3511 Principal Engineer, Filesystem Software email: - 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

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