Comment 8 for bug 1618151

------- Comment From <email address hidden> 2016-09-27 19:58 EDT-------
This is verified successfully.
Updating tags.

The controller release function is only called when the last reference to one of its devices (eg, disks) is dropped.

# echo 'func pcibios_free_controller_deferred +pf' > /sys/kernel/debug/dynamic_debug/control

# lspci | grep Fibre
0021:01:00.0 Fibre Channel: Emulex Corporation Lancer-X: LightPulse Fibre Channel Host Adapter (rev 30)
0021:01:00.1 Fibre Channel: Emulex Corporation Lancer-X: LightPulse Fibre Channel Host Adapter (rev 30)

# ls -ld /sys/block/sd* | grep -m1 0021:01:00.0
<...> /sys/block/sdav -> ../devices/pci0021:01/0021:01:00.0/<...>

# ls -ld /sys/block/sd* | grep -m1 0021:01:00.1
<...> /sys/block/sdaa -> ../devices/pci0021:01/0021:01:00.1/<...>

# cat >/dev/sdav & pid1=$!
# cat >/dev/sdaa & pid2=$!

# dmesg -c >/dev/null

# drmgr -w 5 -d 1 -c phb -s 'PHB 33' -r
Validating PHB DLPAR capability...yes.

# dmesg -c | tail -n3
[11629.473248] iommu: Removing device 0021:01:00.0 from group 1
[11639.480792] pci_bus 0021:01: busn_res: [bus 01-ff] is released
[11639.480874] rpadlpar_io: slot PHB 33 removed

# kill -9 $pid1
# dmesg -c
[11682.255067] scsi 5:0:0:1: rdac: Detached

# kill -9 $pid2
# dmesg -c
[11695.380191] scsi 4:0:1:2: rdac: Detached
[11695.380359] pcibios_free_controller_deferred: domain 33, dynamic 1