Messages in this thread | | | Date | Thu, 10 Jun 2021 09:06:19 +0100 | From | Marc Zyngier <> | Subject | Re: linux-next: NVME using PCI legacy interrupts only |
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On Wed, 09 Jun 2021 19:43:57 +0100, Heiner Kallweit <hkallweit1@gmail.com> wrote: > > I found that on linux-next from June 8th my nvme disk is using legacy > interrupts only. Some debugging lead me to irq_find_mapping() in > msi_domain_alloc() returning -EEXIST. > > The nvme core first allocates a MSI-X interrupt for setup purposes > and later frees it and allocates the final number of MSI-X interrupts. > > The following experimental change brought back the MSI-X interrupts. > This makes me think that somehow freeing a MSI-X interrupt doesn't > free it completely. I didn't see this behavior a few days ago, > therefore I think it's related to the recent changes to > irqdomain/genirq. > > Didn't do a bisect yet, maybe you have an idea already.
Yeah, recent changes in the irqdomain subsystem seem to have uncovered a long standing issue where we are leaving dangling references in some domains....
I've now dropped the branch from -next while I figure it out.
Thanks,
M.
-- Without deviation from the norm, progress is not possible.
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