[ppc64le] Kdump kernel crash during eeh_pseries_init() function.

Issue

• Kdump test fails at pseries_eeh_get_pe_config_addr.isra.0 or eeh_pseries_init with below stack traces.

[    0.027752] BUG: Kernel NULL pointer dereference on write at 0x00000268
[    0.027760] Faulting instruction address: 0xc000000008104b54
[    0.027768] Oops: Kernel access of bad area, sig: 11 [#1]
[    0.027774] LE PAGE_SIZE=64K MMU=Hash SMP NR_CPUS=2048 NUMA pSeries
[    0.027783] Modules linked in:
[    0.027790] CPU: 246 PID: 1 Comm: swapper/246 Not tainted 5.14.0-70.13.1.el9_0.ppc64le #1
[    0.027800] NIP:  c000000008104b54 LR: c00000000a023bfc CTR: 00000000006db41c
[    0.027809] REGS: c0000000126df820 TRAP: 0380   Not tainted  (5.14.0-70.13.1.el9_0.ppc64le)
[    0.027817] MSR:  8000000002009033 <SF,VEC,EE,ME,IR,DR,RI,LE>  CR: 4800028f  XER: 00000004
[    0.027840] CFAR: c000000008104aa0 IRQMASK: 0
[    0.027840] GPR00: c00000000a023bfc c0000000126dfac0 c00000000aa47c00 000000000000004d
[    0.027840] GPR04: 0000000000000004 0000000000000000 c0000000126dfb2c 0000000000000000
[    0.027840] GPR08: 00000000fffeffff 000000000000004d 0000000000000001 0000000000000000
[    0.027840] GPR12: c0000000f5ffffa8 c00000000ade4000 c000000008012748 0000000000000000
[    0.027840] GPR16: 0000000000000000 0000000000000000 0000000000000000 0000000000000000
[    0.027840] GPR20: 0000000000000000 0000000000000000 0000000000000000 0000000000000000
[    0.027840] GPR24: c00000000a003834 0000000000000004 c0000000092f9a18 c00000000a091948
[    0.027840] GPR28: 0000000000000000 c00000000a555858 0000000000000000 0000000000000000
[    0.027942] NIP [c000000008104b54] pseries_eeh_get_pe_config_addr.isra.0+0xf4/0x1b0
[    0.027955] LR [c00000000a023bfc] eeh_pseries_init+0x2ec/0x360
[    0.027966] Call Trace:
[    0.027970] [c0000000126dfac0] [c0000000092f9a18] __param_initcall_debug+0x0/0x28 (unreliable)
[    0.027985] [c0000000126dfb50] [c00000000a023bfc] eeh_pseries_init+0x2ec/0x360
[    0.027997] [c0000000126dfbd0] [c000000008012140] do_one_initcall+0x60/0x2c0
[    0.028008] [c0000000126dfca0] [c00000000a005340] do_initcalls+0x13c/0x190
[    0.028019] [c0000000126dfd50] [c00000000a005670] kernel_init_freeable+0x240/0x2b4
[    0.028030] [c0000000126dfdb0] [c000000008012770] kernel_init+0x30/0x1a0
[    0.028041] [c0000000126dfe10] [c00000000800cd64] ret_from_kernel_thread+0x5c/0x64
[    0.028051] Instruction dump:
[    0.028057] ebc1fff0 4e800020 60000000 7c0802a6 fbe10088 7c7f07b4 39400001 7d2307b4
[    0.028075] 38800004 38c1006c 7fe7fb78 f80100a0 <e9050268> 38a00002 79090020 79080022
[    0.028096] ---[ end trace 7f80c88f2d97c63c ]---
[    0.031500]
[    1.031505] Kernel panic - not syncing: Fatal exception
[    1.049042] Rebooting in 10 seconds..