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linux/arch/powerpc
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Nathan Lynch 7280fdb80b powerpc/rtas: avoid scheduling in rtas_os_term() 
[ Upstream commit 6c606e57ee ]

It's unsafe to use rtas_busy_delay() to handle a busy status from
the ibm,os-term RTAS function in rtas_os_term():

Kernel panic - not syncing: Attempted to kill init! exitcode=0x0000000b
BUG: sleeping function called from invalid context at arch/powerpc/kernel/rtas.c:618
in_atomic(): 1, irqs_disabled(): 1, non_block: 0, pid: 1, name: swapper/0
preempt_count: 2, expected: 0
CPU: 7 PID: 1 Comm: swapper/0 Tainted: G      D            6.0.0-rc5-02182-gf8553a572277-dirty #9
Call Trace:
[c000000007b8f000] [c000000001337110] dump_stack_lvl+0xb4/0x110 (unreliable)
[c000000007b8f040] [c0000000002440e4] __might_resched+0x394/0x3c0
[c000000007b8f0e0] [c00000000004f680] rtas_busy_delay+0x120/0x1b0
[c000000007b8f100] [c000000000052d04] rtas_os_term+0xb8/0xf4
[c000000007b8f180] [c0000000001150fc] pseries_panic+0x50/0x68
[c000000007b8f1f0] [c000000000036354] ppc_panic_platform_handler+0x34/0x50
[c000000007b8f210] [c0000000002303c4] notifier_call_chain+0xd4/0x1c0
[c000000007b8f2b0] [c0000000002306cc] atomic_notifier_call_chain+0xac/0x1c0
[c000000007b8f2f0] [c0000000001d62b8] panic+0x228/0x4d0
[c000000007b8f390] [c0000000001e573c] do_exit+0x140c/0x1420
[c000000007b8f480] [c0000000001e586c] make_task_dead+0xdc/0x200

Use rtas_busy_delay_time() instead, which signals without side effects
whether to attempt the ibm,os-term RTAS call again.

Signed-off-by: Nathan Lynch <nathanl@linux.ibm.com>
Reviewed-by: Nicholas Piggin <npiggin@gmail.com>
Reviewed-by: Andrew Donnellan <ajd@linux.ibm.com>
Signed-off-by: Michael Ellerman <mpe@ellerman.id.au>
Link: https://lore.kernel.org/r/20221118150751.469393-5-nathanl@linux.ibm.com
Signed-off-by: Sasha Levin <sashal@kernel.org>
History 2023-01-12 11:58:46 +01:00
..
boot powerpc: Fix SPE Power ISA properties for e500v1 platforms 2022-10-26 12:35:23 +02:00
configs powerpc/configs: Properly enable PAPR_SCM in pseries_defconfig 2022-10-26 12:35:21 +02:00
crypto powerpc: flexible GPR range save/restore macros 2022-07-12 16:35:02 +02:00
include powerpc: Fix fallocate and fadvise64_64 compat parameter combination 2022-10-26 12:35:22 +02:00
kernel powerpc/rtas: avoid scheduling in rtas_os_term() 2023-01-12 11:58:46 +01:00
kexec powerpc: Set crashkernel offset to mid of RMA region 2022-04-13 20:59:03 +02:00
kvm KVM: PPC: Book3S HV: Fix "rm_exit" entry in debugfs timings 2022-08-25 11:40:40 +02:00
lib powerpc: flexible GPR range save/restore macros 2022-07-12 16:35:02 +02:00
math-emu powerpc/math_emu/efp: Include module.h 2022-10-26 12:35:21 +02:00
mm powerpc/64s/radix: don't need to broadcast IPI for radix pmd collapse flush 2022-10-12 09:53:26 +02:00
net powerpc64/bpf: Limit 'ldbrx' to processors compliant with ISA v2.06 2022-02-01 17:27:09 +01:00
perf powerpc/hv-gpci: Fix hv_gpci event list 2022-12-31 13:14:35 +01:00
platforms powerpc/pseries/eeh: use correct API for error log size 2022-12-31 13:14:36 +01:00
purgatory powerpc/kexec: Don't use .machine ppc64 in trampoline_64.S 2021-04-08 21:17:43 +10:00
sysdev powerpc/xive: add missing iounmap() in error path in xive_spapr_populate_irq_data() 2022-12-31 13:14:35 +01:00
tools powerpc/64: Add UADDR64 relocation support 2022-05-09 09:14:44 +02:00
xmon powerpc/xmon: Fix -Wswitch-unreachable warning in bpt_cmds 2022-12-31 13:14:35 +01:00
Kbuild powerpc/kexec: Move kexec files into a dedicated subdir. 2019-11-21 15:41:34 +11:00
Kconfig powerpc/memhotplug: Add add_pages override for PPC 2022-07-07 17:53:28 +02:00
Kconfig.debug powerpc/ptdump: Convert powerpc to GENERIC_PTDUMP 2021-08-25 13:35:48 +10:00
Makefile powerpc/64s: Fix GENERIC_CPU build flags for PPC970 / G5 2022-10-26 12:35:23 +02:00
Makefile.postlink powerpc: unrel_branch_check.sh: use nm to find symbol value 2020-09-02 11:00:22 +10:00