From: Aaro Koskinen <aaro.koskinen@iki.fi>
To: Thomas Gleixner <tglx@linutronix.de>,
Jason Cooper <jason@lakedaemon.net>,
Marc Zyngier <marc.zyngier@arm.com>
Cc: linux-kernel@vger.kernel.org, tomli@tomli.me,
"Rafael J. Wysocki" <rafael@kernel.org>,
Aaro Koskinen <aaro.koskinen@iki.fi>
Subject: [PATCH] irqchip/i8259: fix shutdown order by moving syscore_ops registration
Date: Wed, 6 Feb 2019 23:26:08 +0200 [thread overview]
Message-ID: <20190206212608.27189-1-aaro.koskinen@iki.fi> (raw)
When using cpufreq on Loongson 2F MIPS platform, "poweroff"
command gets frequently stuck in syscore_shutdown(). The reason is
that i8259A_shutdown() gets called before cpufreq_suspend(), and if we
have pending work then irq_work_sync() in cpufreq_dbs_governor_stop()
gets stuck forever as we have all interrupts masked already.
irq-i8259 is registering syscore_ops using device_initcall(),
while cpufreq uses core_initcall(). Fix the shutdown order simply
by registering the irq syscore_ops during the early IRQ init instead
of using a separate initcall at later stage.
Signed-off-by: Aaro Koskinen <aaro.koskinen@iki.fi>
---
drivers/irqchip/irq-i8259.c | 9 +--------
1 file changed, 1 insertion(+), 8 deletions(-)
diff --git a/drivers/irqchip/irq-i8259.c b/drivers/irqchip/irq-i8259.c
index b0d4aab1a58c..d000870d9b6b 100644
--- a/drivers/irqchip/irq-i8259.c
+++ b/drivers/irqchip/irq-i8259.c
@@ -225,14 +225,6 @@ static struct syscore_ops i8259_syscore_ops = {
.shutdown = i8259A_shutdown,
};
-static int __init i8259A_init_sysfs(void)
-{
- register_syscore_ops(&i8259_syscore_ops);
- return 0;
-}
-
-device_initcall(i8259A_init_sysfs);
-
static void init_8259A(int auto_eoi)
{
unsigned long flags;
@@ -332,6 +324,7 @@ struct irq_domain * __init __init_i8259_irqs(struct device_node *node)
panic("Failed to add i8259 IRQ domain");
setup_irq(I8259A_IRQ_BASE + PIC_CASCADE_IR, &irq2);
+ register_syscore_ops(&i8259_syscore_ops);
return domain;
}
--
2.17.0
next reply other threads:[~2019-02-06 21:26 UTC|newest]
Thread overview: 5+ messages / expand[flat|nested] mbox.gz Atom feed top
2019-02-06 21:26 Aaro Koskinen [this message]
2019-02-07 8:56 ` [PATCH] irqchip/i8259: fix shutdown order by moving syscore_ops registration Marc Zyngier
2019-02-07 20:58 ` Aaro Koskinen
2019-02-14 10:43 ` Marc Zyngier
2019-02-14 18:43 ` Paul Burton
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