Messages in this thread |  | | | Subject | Re: [PATCH/RFC] PCI prepare/activate instead of enable to avoid IRQ storm and rogue DMA access | | From | Andi Kleen <> | | Date | 14 Mar 2007 22:46:47 +0100 |
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Tejun Heo <htejun@gmail.com> 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?
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