[PATCH 0/2] Disable MSI/MSI-X interrupts manually at PCI probe time in PowerPC architecture

Guilherme G. Piccoli gpiccoli at linux.vnet.ibm.com
Wed Aug 19 07:13:48 AEST 2015

These 2 patches correct a bogus behaviour introduced by commit 1851617cd2
("PCI/MSI: Disable MSI at enumeration even if kernel doesn't support MSI").
The commit moved the logic responsible to disable MSI/MSI-X interrupts
at PCI probe time to a new function, named pci_msi_setup_pci_dev(), that
is not reachable in the code path of PowerPC pSeries platform.

Since then, devices aren't able to activate MSI/MSI-X capability, even
after boot. The first patch makes the function pci_msi_setup_pci_dev()
non-static. The second patch inserts a call to the function in powerpc
code, so it explicitly disables MSI/MSI-X interrupts at PCI probe time.

Guilherme G. Piccoli (2):
  PCI: Make pci_msi_setup_pci_dev() non-static for use by arch code
  powerpc/PCI: Disable MSI/MSI-X interrupts at PCI probe time in OF case

 arch/powerpc/kernel/pci_of_scan.c | 3 +++
 drivers/pci/probe.c               | 2 +-
 include/linux/pci.h               | 1 +
 3 files changed, 5 insertions(+), 1 deletion(-)


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