The fix of Powerpc hotplug driver (drivers/pci/hotplug/pnv_php.c) addresses below two issues. 1. Kernel Crash during hot unplug of bridge/switch slot. 2. DPC-Support Enablement - Previously, when we do a hot-unplug operation on a bridge slot, all the ports and devices behind the bridge-ports would be hot-unplugged/offline, but when we do a hot-plug operation on the same bridge slot, all the ports and devices behind the bridge would not get hot-plugged/online. In this case, Only the first port of the bridge gets enabled and the remaining port/devices remain unplugged/offline. After the fix, The hot-unplug and hot-plug operations on the slot associated with the bridge started behaving correctly and became in sync. Now, after the hot plug operation on the same slot, all the bridge ports and devices behind the bridge become hot-plugged/online/restored in the same manner as it was before the hot-unplug operation. Krishna Kumar (2): pci/hotplug/pnv_php: Fix hotplug driver crash on Powernv arch/powerpc: hotplug driver bridge support arch/powerpc/include/asm/ppc-pci.h | 4 +++ arch/powerpc/kernel/pci-hotplug.c | 5 ++-- arch/powerpc/kernel/pci_dn.c | 42 ++++++++++++++++++++++++++++++ drivers/pci/hotplug/pnv_php.c | 3 +-- 4 files changed, 49 insertions(+), 5 deletions(-) -- 2.44.0
