linux-kernel - [PATCH 5.9 013/255] irqchip/sifive-plic: Fix broken irq_set

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Message-Id: <20201117122139.584662453@linuxfoundation.org>
Date:   Tue, 17 Nov 2020 14:02:33 +0100
From:   Greg Kroah-Hartman <gregkh@...uxfoundation.org>
To:     linux-kernel@...r.kernel.org
Cc:     Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
        stable@...r.kernel.org, Greentime Hu <greentime.hu@...ive.com>,
        Marc Zyngier <maz@...nel.org>,
        Anup Patel <anup@...infault.org>,
        Sasha Levin <sashal@...nel.org>
Subject: [PATCH 5.9 013/255] irqchip/sifive-plic: Fix broken irq_set_affinity() callback

From: Greentime Hu <greentime.hu@...ive.com>

[ Upstream commit a7480c5d725c4ecfc627e70960f249c34f5d13e8 ]

An interrupt submitted to an affinity change will always be left enabled
after plic_set_affinity() has been called, while the expectation is that
it should stay in whatever state it was before the call.

Preserving the configuration fixes a PWM hang issue on the Unleashed
board.

[  919.015783] rcu: INFO: rcu_sched detected stalls on CPUs/tasks:
[  919.020922] rcu:     0-...0: (0 ticks this GP)
idle=7d2/1/0x4000000000000002 softirq=1424/1424 fqs=105807
[  919.030295]  (detected by 1, t=225825 jiffies, g=1561, q=3496)
[  919.036109] Task dump for CPU 0:
[  919.039321] kworker/0:1     R  running task        0    30      2 0x00000008
[  919.046359] Workqueue: events set_brightness_delayed
[  919.051302] Call Trace:
[  919.053738] [<ffffffe000930d92>] __schedule+0x194/0x4de
[  982.035783] rcu: INFO: rcu_sched detected stalls on CPUs/tasks:
[  982.040923] rcu:     0-...0: (0 ticks this GP)
idle=7d2/1/0x4000000000000002 softirq=1424/1424 fqs=113325
[  982.050294]  (detected by 1, t=241580 jiffies, g=1561, q=3509)
[  982.056108] Task dump for CPU 0:
[  982.059321] kworker/0:1     R  running task        0    30      2 0x00000008
[  982.066359] Workqueue: events set_brightness_delayed
[  982.071302] Call Trace:
[  982.073739] [<ffffffe000930d92>] __schedule+0x194/0x4de
[..]

Fixes: bb0fed1c60cc ("irqchip/sifive-plic: Switch to fasteoi flow")
Signed-off-by: Greentime Hu <greentime.hu@...ive.com>
[maz: tidy-up commit message]
Signed-off-by: Marc Zyngier <maz@...nel.org>
Reviewed-by: Anup Patel <anup@...infault.org>
Link: https://lore.kernel.org/r/20201020081532.2377-1-greentime.hu@sifive.com
Signed-off-by: Sasha Levin <sashal@...nel.org>
---
 drivers/irqchip/irq-sifive-plic.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/drivers/irqchip/irq-sifive-plic.c b/drivers/irqchip/irq-sifive-plic.c
index eaa3e9fe54e91..4048657ece0ac 100644
--- a/drivers/irqchip/irq-sifive-plic.c
+++ b/drivers/irqchip/irq-sifive-plic.c
@@ -151,7 +151,7 @@ static int plic_set_affinity(struct irq_data *d,
 		return -EINVAL;
 
 	plic_irq_toggle(&priv->lmask, d, 0);
-	plic_irq_toggle(cpumask_of(cpu), d, 1);
+	plic_irq_toggle(cpumask_of(cpu), d, !irqd_irq_masked(d));
 
 	irq_data_update_effective_affinity(d, cpumask_of(cpu));
 
-- 
2.27.0