Messages in this thread | | | Date | Wed, 31 Oct 2001 09:33:53 +0100 | From | Jens Axboe <> | Subject | Re: SCSI tape crashes (was Re: BUG() in asm/pci.h:142 with 2.4.13) |
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On Tue, Oct 30 2001, Dan Maas wrote: > > Can people try out this patch? I believe this will fix the bug. > > + tb->sg[0].page = NULL; > > if (tb->sg[segs].address == NULL) { > > For the sake of making this clear to other kernel hackers (I got bitten by > it too) - starting with 2.4.13 you must zero out the fields of struct > scatterlist that you are not using. i.e. it is no longer sufficient to > simply set sg.address and sg.length, because junk might still be present in > the new sg.page field, and pci_map_*() will BUG() if both sg.address and > sg.page are non-zero.
True, perhaps we should add a init_sg or something like that.
-- Jens Axboe
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