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    SubjectRe: [PATCH/RFC] PCI prepare/activate instead of enable to avoid IRQ storm and rogue DMA access
    Andi Kleen wrote:
    > Tejun Heo <> writes:
    >> Let's assume there's a device which shares its INTX IRQ line with
    >> another device and the other one is already initialized. During boot,
    >> due to BIOS's fault, bad hardware design or sheer bad luck, the device
    >> has got a pending IRQ.
    > This seems to be also common after kexec during kexec crashdumps
    > where the device just continues doing what it did before the crash.
    >> This patch expands the pci_set_master() approach. Instead of enabling
    >> the device in one go, it's done in two steps - prepare and activate.
    >> 'prepare' enables access to PCI configuration,
    > I hope there aren't any new erratas triggered by this. Perhaps it would
    > make sense to add some paranoia sleeps at least before touching other
    > state?

    Do you mean between disabling IRQ mechanisms and enabling PCI device in


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