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| author |   Nicholas Piggin <npiggin@gmail.com> | 2016-12-20 04:30:07 +1000 |
|---|---|---|
| committer |   Michael Ellerman <mpe@ellerman.id.au> | 2017-04-28 21:02:25 +1000 |
| commit | 2b4f3ac5642672595ef6f71d1572b32475e94863 (patch) | |
| tree | 3281669fba772ba54d641541c659337bbf8ab58f /arch/powerpc/kernel/traps.c | |
| parent | powerpc/64s: Dedicated system reset interrupt stack (diff) | |
| download | linux-dev-2b4f3ac5642672595ef6f71d1572b32475e94863.tar.xz linux-dev-2b4f3ac5642672595ef6f71d1572b32475e94863.zip | |
powerpc: Mark system reset as an NMI with nmi_enter/exit()
System reset is a non-maskable interrupt from Linux's point of view
(occurs under local_irq_disable()), so it should use nmi_enter/exit.
Signed-off-by: Nicholas Piggin <npiggin@gmail.com>
Signed-off-by: Michael Ellerman <mpe@ellerman.id.au>
Diffstat (limited to '')
| -rw-r--r-- | arch/powerpc/kernel/traps.c | 11 |
1 files changed, 11 insertions, 0 deletions
diff --git a/arch/powerpc/kernel/traps.c b/arch/powerpc/kernel/traps.c index 2393d3c46236..6a81a451d767 100644 --- a/arch/powerpc/kernel/traps.c +++ b/arch/powerpc/kernel/traps.c @@ -279,6 +279,14 @@ void _exception(int signr, struct pt_regs *regs, int code, unsigned long addr) void system_reset_exception(struct pt_regs *regs) { + /* + * Avoid crashes in case of nested NMI exceptions. Recoverability + * is determined by RI and in_nmi + */ + bool nested = in_nmi(); + if (!nested) + nmi_enter(); + /* See if any machine dependent calls */ if (ppc_md.system_reset_exception) { if (ppc_md.system_reset_exception(regs)) @@ -297,6 +305,9 @@ out: if (!(regs->msr & MSR_RI)) panic("Unrecoverable System Reset"); + if (!nested) + nmi_exit(); + /* What should we do here? We could issue a shutdown or hard reset. */ } |