powerpc/traps: restore recoverability of machine_check interrupts

[ Upstream commit daf00ae71dad8aa05965713c62558aeebf2df48e ]

commit b96672dd840f ("powerpc: Machine check interrupt is a non-
maskable interrupt") added a call to nmi_enter() at the beginning of
machine check restart exception handler. Due to that, in_interrupt()
always returns true regardless of the state before entering the
exception, and die() panics even when the system was not already in
interrupt.

This patch calls nmi_exit() before calling die() in order to restore
the interrupt state we had before calling nmi_enter()

Fixes: b96672dd840f ("powerpc: Machine check interrupt is a non-maskable interrupt")
Signed-off-by: Christophe Leroy <christophe.leroy@c-s.fr>
Reviewed-by: Nicholas Piggin <npiggin@gmail.com>
Signed-off-by: Michael Ellerman <mpe@ellerman.id.au>
Signed-off-by: Sasha Levin <sashal@kernel.org>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

diff --git a/arch/powerpc/kernel/traps.c b/arch/powerpc/kernel/traps.c
index c85adb8..8689a02 100644 (file)
--- a/arch/powerpc/kernel/traps.c
+++ b/arch/powerpc/kernel/traps.c
@@ -767,12 +767,17 @@ void machine_check_exception(struct pt_regs *regs)
        if (check_io_access(regs))
                goto bail;
 
-       die("Machine check", regs, SIGBUS);
-
        /* Must die if the interrupt is not recoverable */
        if (!(regs->msr & MSR_RI))
                nmi_panic(regs, "Unrecoverable Machine check");
 
+       if (!nested)
+               nmi_exit();
+
+       die("Machine check", regs, SIGBUS);
+
+       return;
+
 bail:
        if (!nested)
                nmi_exit();