Messages in this thread | | | Date | Thu, 22 Nov 2007 19:01:39 -0600 | From | Robert Hancock <> | Subject | Re: [PATCH] sata_nv: fix ADMA ATAPI issues with memory over 4GB (v2) |
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Tejun Heo wrote: > Hello, Robert. > > Robert Hancock wrote: >> This fixes some problems with ATAPI devices on nForce4 controllers in ADMA >> mode on systems with memory located above 4GB. We need to delay setting the >> 64-bit DMA mask until the PRD table and padding buffer are allocated so that >> they don't get allocated above 4GB and break legacy mode (which is needed for >> ATAPI devices). Also, explicitly set a 32-bit DMA mask before allocating the >> legacy buffers since setting the DMA mask affects both ports and we need to >> ensure the second port's buffers are allocated properly (fixes a problem >> with the previous version of this patch). >> >> Signed-off-by: Robert Hancock <hancockr@shaw.ca> >> >> + /* Ensure DMA mask is set to 32-bit before allocating legacy PRD and >> + pad buffers */ >> + pci_set_dma_mask(pdev, DMA_BIT_MASK(32)); >> + pci_set_consistent_dma_mask(pdev, DMA_BIT_MASK(32)); > [--snip--] >> + pci_set_dma_mask(pdev, DMA_BIT_MASK(64)); >> + pci_set_consistent_dma_mask(pdev, DMA_BIT_MASK(64)); > > I'm probably being paranoid here but please add error checks. Just > checking return value and returning error suffices.
In the 32-bit case, I'm pretty sure those are guaranteed not to fail because 32-bit is the default. For the 64-bit ones, we don't care if they fail, because then we'll just use whatever mask ends up being set (we store the actual set DMA mask in adma_dma_mask for use when we need to reconfigure the bounce limit). We definitely don't want to fail initialization if the 64-bit set doesn't succeed.. - 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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