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    SubjectRe: [PATCH RFC 34/77] ioat: Update MSI/MSI-X interrupts enablement code
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    On Wed, Oct 2, 2013 at 10:31 AM, Williams, Dan J
    <dan.j.williams@intel.com> wrote:
    > [ dropping all cc's except lkml ]
    >
    > On Wed, Oct 2, 2013 at 3:48 AM, Alexander Gordeev <agordeev@redhat.com> wrote:
    >> As result of recent re-design of the MSI/MSI-X interrupts enabling
    >> pattern this driver has to be updated to use the new technique to
    >> obtain a optimal number of MSI/MSI-X interrupts required.
    >>
    >
    > What happens if this patch is not applied. This changelog does not
    > have enough information for me to judge the patch. Unless I missed it
    > I do not see a patch 00/77 explaining the background of the change,
    > and a quick search did not turn up a discussion of why drivers now
    > need to call pci_msix_table_size() prior to pci_enable_msix.

    I see patch 00/77 now and I still don't see the need for ioatdma to be
    updated. If we fail the subsequent request_irq, the driver will still
    fall back to trying less interrupts.


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