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linux-stable/arch/powerpc
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Vasant Hegde 52862ab33c powerpc/powernv/prd: Unregister OPAL_MSG_PRD2 notifier during module unload 
Commit 587164cd, introduced new opal message type (OPAL_MSG_PRD2) and
added opal notifier. But I missed to unregister the notifier during
module unload path. This results in below call trace if you try to
unload and load opal_prd module.

Also add new notifier_block for OPAL_MSG_PRD2 message.

Sample calltrace (modprobe -r opal_prd; modprobe opal_prd)
  BUG: Unable to handle kernel data access on read at 0xc0080000192200e0
  Faulting instruction address: 0xc00000000018d1cc
  Oops: Kernel access of bad area, sig: 11 [#1]
  LE PAGE_SIZE=64K MMU=Radix SMP NR_CPUS=2048 NUMA PowerNV
  CPU: 66 PID: 7446 Comm: modprobe Kdump: loaded Tainted: G            E     5.14.0prd #759
  NIP:  c00000000018d1cc LR: c00000000018d2a8 CTR: c0000000000cde10
  REGS: c0000003c4c0f0a0 TRAP: 0300   Tainted: G            E      (5.14.0prd)
  MSR:  9000000002009033 <SF,HV,VEC,EE,ME,IR,DR,RI,LE>  CR: 24224824  XER: 20040000
  CFAR: c00000000018d2a4 DAR: c0080000192200e0 DSISR: 40000000 IRQMASK: 1
  ...
  NIP notifier_chain_register+0x2c/0xc0
  LR  atomic_notifier_chain_register+0x48/0x80
  Call Trace:
    0xc000000002090610 (unreliable)
    atomic_notifier_chain_register+0x58/0x80
    opal_message_notifier_register+0x7c/0x1e0
    opal_prd_probe+0x84/0x150 [opal_prd]
    platform_probe+0x78/0x130
    really_probe+0x110/0x5d0
    __driver_probe_device+0x17c/0x230
    driver_probe_device+0x60/0x130
    __driver_attach+0xfc/0x220
    bus_for_each_dev+0xa8/0x130
    driver_attach+0x34/0x50
    bus_add_driver+0x1b0/0x300
    driver_register+0x98/0x1a0
    __platform_driver_register+0x38/0x50
    opal_prd_driver_init+0x34/0x50 [opal_prd]
    do_one_initcall+0x60/0x2d0
    do_init_module+0x7c/0x320
    load_module+0x3394/0x3650
    __do_sys_finit_module+0xd4/0x160
    system_call_exception+0x140/0x290
    system_call_common+0xf4/0x258

Fixes: 587164cd59 ("powerpc/powernv: Add new opal message type")
Cc: stable@vger.kernel.org # v5.4+
Signed-off-by: Vasant Hegde <hegdevasant@linux.vnet.ibm.com>
Signed-off-by: Michael Ellerman <mpe@ellerman.id.au>
Link: https://lore.kernel.org/r/20211028165716.41300-1-hegdevasant@linux.vnet.ibm.com
2021-10-29 16:47:32 +11:00
..
boot powerpc/boot: Set LC_ALL=C in wrapper script 2021-10-27 22:31:22 +11:00
configs powerpc/64s: Default to 64K pages for 64 bit book3s 2021-10-27 22:31:22 +11:00
crypto crypto: powepc/sha1 - remove unneeded semicolon 2021-03-07 15:13:14 +11:00
include Merge branch 'topic/ppc-kvm' into next 2021-10-29 00:00:57 +11:00
kernel powerpc/64s/interrupt: Fix check_return_regs_valid() false positive 2021-10-27 22:33:47 +11:00
kexec powerpc/machdep: Remove stale functions from ppc_md structure 2021-10-22 15:22:05 +11:00
kvm Merge branch 'topic/ppc-kvm' into next 2021-10-29 00:00:57 +11:00
lib powerpc/security: Use a mutex for interrupt exit code patching 2021-10-28 17:23:58 +11:00
math-emu powerpc/64s: avoid reloading (H)SRR registers if they are still valid 2021-06-25 00:06:55 +10:00
mm powerpc: Don't provide __kernel_map_pages() without ARCH_SUPPORTS_DEBUG_PAGEALLOC 2021-10-29 11:10:43 +11:00
net powerpc/bpf: Fix write protecting JIT code 2021-10-28 00:08:32 +11:00
perf powerpc/perf: Fix cycles/instructions as PM_CYC/PM_INST_CMPL in power10 2021-10-14 21:46:45 +11:00
platforms powerpc/powernv/prd: Unregister OPAL_MSG_PRD2 notifier during module unload 2021-10-29 16:47:32 +11:00
purgatory powerpc/kexec: Don't use .machine ppc64 in trampoline_64.S 2021-04-08 21:17:43 +10:00
sysdev powerpc/dcr: Use cmplwi instead of 3-argument cmpli 2021-10-28 22:29:25 +11:00
tools powerpc/head_check: Fix shellcheck errors 2021-08-17 22:52:02 +10:00
xmon powerpc/xmon: fix task state output 2021-10-28 22:32:03 +11:00
Kbuild
Kconfig powerpc/64s: Default to 64K pages for 64 bit book3s 2021-10-27 22:31:22 +11:00
Kconfig.debug powerpc/ptdump: Convert powerpc to GENERIC_PTDUMP 2021-08-25 13:35:48 +10:00
Makefile powerpc: Add "-z notext" flag to disable diagnostic 2021-08-15 13:49:39 +10:00
Makefile.postlink