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[RFC,kernel,0/2] irq: Add reference counting to IRQ mappings

Message ID 20201027090655.14118-1-aik@ozlabs.ru (mailing list archive)
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Series irq: Add reference counting to IRQ mappings | expand

Message

Alexey Kardashevskiy Oct. 27, 2020, 9:06 a.m. UTC 
This is an attempt to fix a bug with PCI hot unplug with
a bunch of PCIe bridges and devices sharing INTx.

This did not hit us before as even if we did not
call irq_domain_ops::unmap, the platform (PowerVM) would not
produce an error but with POWER9's XIVE interrupt controller
there is an error if unmap is not called at all (2/2 fixes that)
or an error if we unmapped an interrupt which is still in use
by another device (1/2 fixes that).

One way of fixing that is doing reference counting in
the POWERPC code but since there is a kobj in irq_desc
already, I thought I'll give it a try first.


This is based on sha1
4525c8781ec0 Linus Torvalds "scsi: qla2xxx: remove incorrect sparse #ifdef".

Please comment. Thanks.



Alexey Kardashevskiy (1):
  irq: Add reference counting to IRQ mappings

Oliver O'Halloran (1):
  powerpc/pci: Remove LSI mappings on device teardown

 arch/powerpc/kernel/pci-common.c | 21 +++++++++++++++++++
 kernel/irq/irqdesc.c             | 35 +++++++++++++++++++++-----------
 kernel/irq/irqdomain.c           | 27 ++++++++++++------------
 3 files changed, 57 insertions(+), 26 deletions(-)