Messages in this thread | | | From | David Mosberger <> | Date | Wed, 4 Jun 2003 23:42:16 -0700 | Subject | problem with blk_queue_bounce_limit() |
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On platforms with I/O MMU hardware, memory above 4GB, and IDE hard disks, this check:
BUG_ON(dma_addr < BLK_BOUNCE_ISA);
causes an instant panic. The reason is quite obvious: since there is an I/O MMU, BLK_BOUNCE_ISA is effectively unlimited, and most IDE controllers can of course DMA only to <4GB.
So, the check is wrong. I think the proper way to fix this is to pass a "struct dev" into the routine and then to use dma_supported() to check whether bounce buffers will be needed. Do you agree? If so, can you fix it?
Thanks,
--david - 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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