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    SubjectRe: [RFC][PATCH] Reset PCIe devices to address DMA problem on kdump with iommu
    On Tue, Sep 11, 2012 at 07:32:35PM +0900, Takao Indoh wrote:

    [..]
    > I'll post new patch which clears bus master bit and resets devices in
    > second kernel.
    >
    > As to the boot parameter to enable this function, you suggested using
    > reset_devices. I found that on a certain platform resetting devices
    > caused PCIe error due to a hardware bug. Therefore I think we need
    > new parameter apart from reset_devices to disable this function on
    > such a machine.

    Can you explain a bit more how the error happens. I still don't think
    that because of a bug in a platform somewhere we should be introducing
    a separate command line parameter and not reuse the exisiting one. Also
    you have not explained what's the bug and how a new parameter will
    avoid the bug.

    Thanks
    Vivek


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