linux-kernel - [PATCH v2 08/17] powerpc/fsl_booke: ensure SPEFloatingPointException() reenables interrupts

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Message-Id: <b88a6913cf1660c6aa2135ef7e900a6e0e0eb332.1553877076.git.christophe.leroy@c-s.fr>
Date:   Fri, 29 Mar 2019 16:38:30 +0000 (UTC)
From:   Christophe Leroy <christophe.leroy@....fr>
To:     Benjamin Herrenschmidt <benh@...nel.crashing.org>,
        Paul Mackerras <paulus@...ba.org>,
        Michael Ellerman <mpe@...erman.id.au>,
        Nicholas Piggin <npiggin@...il.com>
Cc:     linux-kernel@...r.kernel.org, linuxppc-dev@...ts.ozlabs.org
Subject: [PATCH v2 08/17] 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@...nel.crashing.org>
Signed-off-by: Christophe Leroy <christophe.leroy@....fr>
---
 arch/powerpc/kernel/traps.c | 8 ++++++++
 1 file changed, 8 insertions(+)

diff --git a/arch/powerpc/kernel/traps.c b/arch/powerpc/kernel/traps.c
index 1fd45a8650e1..665f294725cb 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);
-- 
2.13.3