PCI/portdrv: Do not setup up IRQs if there are no users

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Avoid registering service IRQs if there is no service that offers them
or no driver to register a handler against them. This saves IRQ vectors
when they are limited (e.g. on x86) and also avoids that spurious events
could hit a missing handler. Such spurious events need to be generated
by the Jailhouse hypervisor for active MSI vectors when enabling or
disabling itself.

Link: https://lore.kernel.org/r/8f9a13ac-8ab1-15ac-06cb-c131b488a36f@siemens.com
Signed-off-by: Jan Kiszka <jan.kiszka@siemens.com>
Signed-off-by: Bjorn Helgaas <bhelgaas@google.com>

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Jan Kiszka 2021-08-30 10:08:10 +02:00 • committed by Bjorn Helgaas

parent e4e737bb5c

commit 0e8ae5a6ff

1 changed files with 30 additions and 17 deletions

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drivers/pci/pcie/portdrv_core.c

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