WSL2-Linux-Kernel/arch/s390/pci
Niklas Schnelle 0b2ca2c7d0 s390/pci: fix hot-plug of PCI function missing bus
Under some circumstances in particular with "Reconfigure I/O Path"
a zPCI function may first appear in Standby through a PCI event with
PEC 0x0302 which initially makes it visible to the zPCI subsystem,
Only after that is it configured with a zPCI event  with PEC 0x0301.
If the zbus is still missing a PCI function zero (devfn == 0) when the
PCI event 0x0301 is handled zdev->zbus->bus is still NULL and gets
dereferenced in common code.
Check for this case and enable but don't scan the zPCI function.
This matches what would happen if we immediately got the 0x0301
configuration request or the function was included in CLP List PCI.
In all cases the PCI functions with devfn != 0 will be scanned once
function 0 appears.

Fixes: 3047766bc6 ("s390/pci: fix enabling a reserved PCI function")
Cc: <stable@vger.kernel.org> # 5.8
Signed-off-by: Niklas Schnelle <schnelle@linux.ibm.com>
Acked-by: Pierre Morel <pmorel@linux.ibm.com>
Signed-off-by: Heiko Carstens <hca@linux.ibm.com>
2020-11-03 15:12:16 +01:00
..
Makefile s390/pci: consolidate SR-IOV specific code 2020-09-14 11:38:34 +02:00
pci.c s390 updates for the 5.10 merge window 2020-10-16 12:36:38 -07:00
pci_bus.c VFIO updates for v5.10-rc1 2020-10-22 13:00:44 -07:00
pci_bus.h s390: remove orphaned function declarations 2020-09-30 12:09:54 +02:00
pci_clp.c VFIO updates for v5.10-rc1 2020-10-22 13:00:44 -07:00
pci_debug.c locking/atomic, s390/pci: Remove redundant casts 2019-06-03 12:32:57 +02:00
pci_dma.c dma-mapping: split <linux/dma-mapping.h> 2020-10-06 07:07:03 +02:00
pci_event.c s390/pci: fix hot-plug of PCI function missing bus 2020-11-03 15:12:16 +01:00
pci_insn.c s390/pci: provide support for MIO instructions 2019-04-29 10:47:01 +02:00
pci_iov.c s390/pci: add missing pci_iov.h include 2020-09-16 14:08:47 +02:00
pci_iov.h s390/pci: consolidate SR-IOV specific code 2020-09-14 11:38:34 +02:00
pci_irq.c s390/pci: do not set affinity for floating irqs 2020-04-22 16:20:55 +02:00
pci_mmio.c s390/pci: clarify comment in s390_mmio_read/write 2020-07-27 10:33:24 +02:00
pci_sysfs.c s390/pci: create zPCI bus 2020-04-28 13:49:46 +02:00