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b314427a52
linux/arch/powerpc
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Gavin Shan b314427a52 powerpc/powernv: Fix crash on releasing compound PE 
The compound PE is created to accommodate the devices attached to
one specific PCI bus that consume multiple M64 segments. The compound
PE is made up of one master PE and possibly multiple slave PEs. The
slave PEs should be destroyed when releasing the master PE. A kernel
crash happens when derferencing @pe->pdev on releasing the slave PE
in pnv_ioda_deconfigure_pe().

  # echo 0 > /sys/bus/pci/slots/C7/power
  iommu: Removing device 0000:01:00.1 from group 0
  iommu: Removing device 0000:01:00.0 from group 0
  Unable to handle kernel paging request for data at address 0x00000010
  Faulting instruction address: 0xc00000000005d898
  cpu 0x1: Vector: 300 (Data Access) at [c000000fe8217620]
      pc: c00000000005d898: pnv_ioda_release_pe+0x288/0x610
      lr: c00000000005dbdc: pnv_ioda_release_pe+0x5cc/0x610
      sp: c000000fe82178a0
     msr: 9000000000009033
     dar: 10
   dsisr: 40000000
    current = 0xc000000fe815ab80
    paca    = 0xc00000000ff00400	 softe: 0	 irq_happened: 0x01
      pid   = 2709, comm = sh
  Linux version 4.8.0-rc5-gavin-00006-g745efdb (gwshan@gwshan) \
  (gcc version 4.9.3 (Buildroot 2016.02-rc2-00093-g5ea3bce) ) #586 SMP \
  Tue Sep 6 13:37:29 AEST 2016
  enter ? for help
  [c000000fe8217940] c00000000005d684 pnv_ioda_release_pe+0x74/0x610
  [c000000fe82179e0] c000000000034460 pcibios_release_device+0x50/0x70
  [c000000fe8217a10] c0000000004aba80 pci_release_dev+0x50/0xa0
  [c000000fe8217a40] c000000000704898 device_release+0x58/0xf0
  [c000000fe8217ac0] c000000000470510 kobject_release+0x80/0xf0
  [c000000fe8217b00] c000000000704dd4 put_device+0x24/0x40
  [c000000fe8217b20] c0000000004af94c pci_remove_bus_device+0x12c/0x150
  [c000000fe8217b60] c000000000034244 pci_hp_remove_devices+0x94/0xd0
  [c000000fe8217ba0] c0000000004ca444 pnv_php_disable_slot+0x64/0xb0
  [c000000fe8217bd0] c0000000004c88c0 power_write_file+0xa0/0x190
  [c000000fe8217c50] c0000000004c248c pci_slot_attr_store+0x3c/0x60
  [c000000fe8217c70] c0000000002d6494 sysfs_kf_write+0x94/0xc0
  [c000000fe8217cb0] c0000000002d50f0 kernfs_fop_write+0x180/0x260
  [c000000fe8217d00] c0000000002334a0 __vfs_write+0x40/0x190
  [c000000fe8217d90] c000000000234738 vfs_write+0xc8/0x240
  [c000000fe8217de0] c000000000236250 SyS_write+0x60/0x110
  [c000000fe8217e30] c000000000009524 system_call+0x38/0x108

It fixes the kernel crash by bypassing releasing resources (DMA,
IO and memory segments, PELTM) because there are no resources assigned
to the slave PE.

Fixes: c5f7700bbd ("powerpc/powernv: Dynamically release PE")
Reported-by: Frederic Barrat <fbarrat@linux.vnet.ibm.com>
Signed-off-by: Gavin Shan <gwshan@linux.vnet.ibm.com>
Signed-off-by: Michael Ellerman <mpe@ellerman.id.au>
2016-09-06 14:54:46 +10:00
..
boot Merge branch 'kbuild' of git://git.kernel.org/pub/scm/linux/kernel/git/mmarek/kbuild 2016-08-02 16:37:12 -04:00
configs powerpc updates for 4.8 # 1 2016-07-30 21:01:36 -07:00
crypto crypto: crc32c-vpmsum - Convert to CPU feature based module autoloading 2016-08-09 14:50:17 +10:00
include powerpc: move hmi.c to arch/powerpc/kvm/ 2016-08-22 11:09:33 +10:00
kernel powerpc: signals: Discard transaction state from signal frames 2016-08-29 12:48:40 +10:00
kvm powerpc: move hmi.c to arch/powerpc/kvm/ 2016-08-22 11:09:33 +10:00
lib powerpc/32: Fix crash during static key init 2016-08-10 19:41:58 +10:00
math-emu
mm powerpc: migrate exception table users off module.h and onto extable.h 2016-08-22 11:09:33 +10:00
net powerpc/ebpf/jit: Implement JIT compiler for extended BPF 2016-06-24 15:17:57 +10:00
oprofile powerpc: Various typo fixes 2016-06-14 13:58:26 +10:00
perf powerpc/perf: Fix incorrect event codes in power9-event-list 2016-08-04 20:22:34 +10:00
platforms powerpc/powernv: Fix crash on releasing compound PE 2016-09-06 14:54:46 +10:00
scripts powerpc/ftrace: Add Kconfig & Make glue for mprofile-kernel 2016-03-07 14:53:56 +11:00
sysdev powerpc/xics/opal: Fix processor numbers in OPAL ICP 2016-09-06 14:54:45 +10:00
xmon powerpc: Move cpu_has_feature() to a separate file 2016-08-01 11:15:03 +10:00
Kconfig Implements HARDENED_USERCOPY verification of copy_to_user/copy_from_user 2016-08-08 14:48:14 -07:00
Kconfig.debug powerpc/mm: Catch usage of cpu/mmu_has_feature() before jump label init 2016-08-01 11:15:06 +10:00
Makefile powerpc/Makefile: Use cflags-y/aflags-y for setting endian options 2016-08-10 23:01:53 +10:00
relocs_check.sh