linux-kernel - Re: [PATCH] irqchip/sifive-plic: Fix broken irq_set

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Date:   Sun, 25 Oct 2020 12:37:51 +0000
From:   Marc Zyngier <maz@...nel.org>
To:     jason@...edaemon.net, paul.walmsley@...ive.com,
        linux-riscv@...ts.infradead.org, palmer@...belt.com,
        Greentime Hu <greentime.hu@...ive.com>,
        linux-kernel@...r.kernel.org, tglx@...utronix.de
Subject: Re: [PATCH] irqchip/sifive-plic: Fix broken irq_set_affinity() callback

On Tue, 20 Oct 2020 16:15:32 +0800, Greentime Hu wrote:
> It will always enable the interrupt after calling plic_set_affinity()
> however it should set to it previous setting. Staying disabled or enabled.
> 
> This patch can also fix this pwm hang issue in 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
> [..]

Applied to irq/irqchip-next, with some commit message adjustments.

[1/1] irqchip/sifive-plic: Fix broken irq_set_affinity() callback
      commit: a7480c5d725c4ecfc627e70960f249c34f5d13e8

Cheers,

	M.
-- 
Without deviation from the norm, progress is not possible.