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s390/pci: Do not disable PF when VFs exist 

The Physical function should not be disabled until no virtual
functions depends on it.
Let's force the user to first use echo 0 > sriov_numfs before
allowing to disable the PF with echo 0 > power.

Signed-off-by: Pierre Morel <pmorel@linux.ibm.com>
Reviewed-by: Niklas Schnelle <schnelle@linux.ibm.com>
Signed-off-by: Vasily Gorbik <gor@linux.ibm.com>
This commit is contained in:
Pierre Morel 2020-03-26 12:07:03 -04:00 committed by Vasily Gorbik
parent 44510d6fa0
commit 53dd462ac4
1 changed files with 3 additions and 0 deletions
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3
drivers/pci/hotplug/s390_pci_hpc.c
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@ -91,6 +91,9 @@ static int disable_slot(struct hotplug_slot *hotplug_slot)
pdev = pci_get_slot(zbus->bus, zdev->devfn);
if (pdev) {
if (pci_num_vf(pdev))
return -EBUSY;
pci_stop_and_remove_bus_device_locked(pdev);
pci_dev_put(pdev);
}