On Tue, 25 Apr 2006 22:41:28 +0200 (CEST) Guennadi Liakhovetski wrote: > On Tue, 25 Apr 2006, Randy.Dunlap wrote: > > > I've spent a lot of time using the sg-PIO patch with the aha152x > > driver. The sg-PIO part of it works for me, but the aha152x driver > > sometimes does not complete a full DMA-out transfer (data-out phase). > > The driver calls this the need to "resend" some data (in datao_end()). > > Sorry, didn't quite understand it - you mean the "in" direction modified > to use sg-pio works, whereas the "out" doesn't? How exactly it doesn't > work? It's not a problem with the (your) sg patch. It's just that this SCSI chip sometimes (apparently) stops a DMA-out transfer before it should (e.g., half way thru an sg list). The driver detects this and decides that it needs to "resend" the remaining part of the sg list, but first it must back up the sg list ptr (possibly), the data transfer ptr (before this patch), this_residual, and possibly buffers_residual. I've made many attempts at doing that, but they are not succeeding. > > I can't get this resend logic to work correctly with the sg-PIO > > changes and I can't keep spending time on it without some docs and/or > > errata, so I'll just continue to use my lowmem patch for the > > aha152x driver. > > Could you send me / upload your current patch using k(un)map_atomic_pio? Sure, it's here: http://www.xenotime.net/linux/patches/aha152x-sg-pio.patch --- ~Randy - : send the line "unsubscribe linux-scsi" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html
