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

From: Christophe Leroy
Date: Fri Mar 29 2019 - 12:39:27 EST


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

Suggested-by: Benjamin Herrenschmidt <benh@xxxxxxxxxxxxxxxxxxx>
Signed-off-by: Christophe Leroy <christophe.leroy@xxxxxx>
---
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