From: Christophe Leroy <christophe.leroy@c-s.fr>
Date: Tue, 30 Apr 2019 12:38:57 +0000 (+0000)
Subject: powerpc/fsl_booke: ensure SPEFloatingPointException() reenables interrupts
X-Git-Tag: v5.2-rc1~100^2~61
X-Git-Url: http://git.ipfire.org/?a=commitdiff_plain;h=ef4291243f51d0a69899ee2025de09578c0fcba8;p=thirdparty%2Fkernel%2Flinux.git

powerpc/fsl_booke: ensure SPEFloatingPointException() reenables interrupts

SPEFloatingPointException() is the only exception handler which 'forgets' to
re-enable interrupts. This patch makes sure it does.

Suggested-by: Benjamin Herrenschmidt <benh@kernel.crashing.org>
Signed-off-by: Christophe Leroy <christophe.leroy@c-s.fr>
Signed-off-by: Michael Ellerman <mpe@ellerman.id.au>
---

diff --git a/arch/powerpc/kernel/traps.c b/arch/powerpc/kernel/traps.c
index 1fd45a8650e17..665f294725cb2 100644
--- a/arch/powerpc/kernel/traps.c
+++ b/arch/powerpc/kernel/traps.c
@@ -2088,6 +2088,10 @@ void SPEFloatingPointException(struct pt_regs *regs)
 	int code = FPE_FLTUNK;
 	int err;
 
+	/* We restore the interrupt state now */
+	if (!arch_irq_disabled_regs(regs))
+		local_irq_enable();
+
 	flush_spe_to_thread(current);
 
 	spefscr = current->thread.spefscr;
@@ -2133,6 +2137,10 @@ void SPEFloatingPointRoundException(struct pt_regs *regs)
 	extern int speround_handler(struct pt_regs *regs);
 	int err;
 
+	/* We restore the interrupt state now */
+	if (!arch_irq_disabled_regs(regs))
+		local_irq_enable();
+
 	preempt_disable();
 	if (regs->msr & MSR_SPE)
 		giveup_spe(current);