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    SubjectRe: [PATCH v2 0/2] Reset PCIe devices to address DMA problem on kdump with iommu
    (2012/10/03 4:37), Andi Kleen wrote:
    > Takao Indoh <indou.takao@jp.fujitsu.com> writes:
    >
    >> These patches reset PCIe devices at boot time to address DMA problem on
    >> kdump with iommu. When "reset_devices" is specified, a hot reset is
    >> triggered on each PCIe root port and downstream port to reset its
    >> downstream endpoint.
    >
    > Great. I've been pondering this for a long time, but you did finally
    > implement it. I hope this will make kdump a lot more reliable at least
    > on the systems that support per port reset.

    Actually I got the idea of this patch from your comment below;-)
    http://permalink.gmane.org/gmane.linux.network/162414

    >
    > Now the only question is: why make it a option and not default?

    Except kdump I don't know the situation where this reset is useful, so I
    introduced it as option so that it works only during kdump.

    Thanks,
    Takao Indoh



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