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Nathan Lynch 482d990a5d powerpc/rtas: avoid scheduling in rtas_os_term() 
[ Upstream commit 6c606e57eecc37d6b36d732b1ff7e55b7dc32dd4 ]

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>
2023-01-04 11:28:58 +01:00
..
alpha alpha: fix syscall entry in !AUDUT_SYSCALL case 2022-12-31 13:31:55 +01:00
arc ARC: mm: fix leakage of memory allocated for PTE 2022-10-17 16:32:12 -07:00
arm ARM: dts: aspeed: rainier,everest: Move reserved memory regions 2022-12-31 13:32:56 +01:00
arm64 arm64: dts: qcom: sm8250: fix USB-DP PHY registers 2022-12-31 13:33:09 +01:00
csky - hfs and hfsplus kmap API modernization from Fabio Francesco 2022-10-12 11:00:22 -07:00
hexagon - hfs and hfsplus kmap API modernization from Fabio Francesco 2022-10-12 11:00:22 -07:00
ia64 - hfs and hfsplus kmap API modernization from Fabio Francesco 2022-10-12 11:00:22 -07:00
loongarch LoongArch: mm: Fix huge page entry update for virtual machine 2022-12-08 14:59:15 +08:00
m68k - hfs and hfsplus kmap API modernization from Fabio Francesco 2022-10-12 11:00:22 -07:00
microblaze kbuild: fix "cat: .version: No such file or directory" 2022-11-24 09:26:02 +09:00
mips MIPS: ralink: mt7621: avoid to init common ralink reset controller 2022-12-31 13:33:08 +01:00
nios2 nios2: add FORCE for vmlinuz.gz 2022-11-27 08:28:41 +09:00
openrisc OpenRISC 6.1 Updates 2022-10-15 16:47:33 -07:00
parisc parisc: Avoid printing the hardware path twice 2022-10-31 15:37:14 +01:00
powerpc powerpc/rtas: avoid scheduling in rtas_os_term() 2023-01-04 11:28:58 +01:00
riscv RISC-V: KVM: Fix reg_val check in kvm_riscv_vcpu_set_reg_config() 2022-12-31 13:32:51 +01:00
s390 * Document the interaction between KVM_CAP_HALT_POLL and halt_poll_ns 2022-12-06 10:49:19 -08:00
sh - hfs and hfsplus kmap API modernization from Fabio Francesco 2022-10-12 11:00:22 -07:00
sparc mm: add dummy pmd_young() for architectures not having it 2022-11-30 14:49:41 -08:00
um Random number generator fixes for Linux 6.1-rc1. 2022-10-16 15:27:07 -07:00
x86 x86/apic: Handle no CONFIG_X86_X2APIC on systems with x2APIC enabled by BIOS 2022-12-31 13:32:58 +01:00
xtensa - hfs and hfsplus kmap API modernization from Fabio Francesco 2022-10-12 11:00:22 -07:00
.gitignore
Kconfig ftrace: Allow WITH_ARGS flavour of graph tracer with shadow call stack 2022-12-31 13:32:45 +01:00