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(-) -- 2.17.1
