PCI: Do any VF BAR updates before enabling the BARs

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Previously we enabled VFs and enable their memory space before calling
pcibios_sriov_enable().  But pcibios_sriov_enable() may update the VF BARs:
for example, on PPC PowerNV we may change them to manage the association of
VFs to PEs.

Because 64-bit BARs cannot be updated atomically, it's unsafe to update
them while they're enabled.  The half-updated state may conflict with other
devices in the system.

Call pcibios_sriov_enable() before enabling the VFs so any BAR updates
happen while the VF BARs are disabled.

[bhelgaas: changelog]
Tested-by: Carol Soto <clsoto@us.ibm.com>
Signed-off-by: Gavin Shan <gwshan@linux.vnet.ibm.com>
Signed-off-by: Bjorn Helgaas <bhelgaas@google.com>

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This commit is contained in:

Gavin Shan 2016-10-26 12:15:35 +11:00 • committed by Bjorn Helgaas

parent 1600f62534

commit f40ec3c748

1 changed files with 7 additions and 7 deletions

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drivers/pci/iov.c

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