PCI: Test INTx masking during enumeration, not at run-time

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The test for INTx masking via PCI_COMMAND_INTX_DISABLE performed in
pci_intx_mask_supported() should be done before the device can be used.
This is to avoid writing PCI_COMMAND while the driver owns the device, in
case that has any effect on MSI/MSI-X interrupts.

Move the content of pci_intx_mask_supported() to pci_intx_mask_broken() and
call it from pci_setup_device().

The test result can be queried at any time later using the same
pci_intx_mask_supported() interface as before (though with changed
implementation), so callers (uio, vfio) should be unaffected.

Signed-off-by: Piotr Gregor <piotrgregor@rsyncme.org>
[bhelgaas: changelog, remove quirk check, remove locking, move
dev->broken_intx_masking assignment to caller]
Signed-off-by: Bjorn Helgaas <bhelgaas@google.com>
Reviewed-by: Alex Williamson <alex.williamson@redhat.com>
Acked-by: Michael S. Tsirkin <mst@redhat.com>

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Piotr Gregor 2017-05-26 22:02:25 +01:00 • committed by Bjorn Helgaas

parent 2ea659a9ef

commit 99b3c58f7b

3 changed files with 41 additions and 43 deletions

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42

drivers/pci/pci.c

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30

drivers/pci/probe.c

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12

include/linux/pci.h

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