Messages in this thread | | | Subject | Re: highmem, aic7xxx, and vfat: too few segs for dma mapping | From | Steve Lord <> | Date | 13 Dec 2001 15:17:24 -0600 |
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On Thu, 2001-12-13 at 14:58, Steve Lord wrote: > 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. >
OK, I can confirm this fixes it for me. A side not for Jens, this still pushes the scsi layer into those DMA shortage messages:
Warning - running *really* short on DMA buffers SCSI: depth is 175, # segs 128, # hw segs 1 Warning - running *really* short on DMA buffers Warning - running *really* short on DMA buffers SCSI: depth is 181, # segs 128, # hw segs 1 Warning - running *really* short on DMA buffers SCSI: depth is 182, # segs 128, # hw segs 1 Warning - running *really* short on DMA buffers SCSI: depth is 183, # segs 128, # hw segs 1 SCSI: depth is 173, # segs 128, # hw segs 1
Steve
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Steve Lord voice: +1-651-683-3511 Principal Engineer, Filesystem Software email: lord@sgi.com - To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to majordomo@vger.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/
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