linux-kernel - [PATCH 2/2] [RFC] genirq: Set IRQCHIP_SKIP_SET_WAKE for no_irq_chip and dummy_irq

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Message-Id: <1418218575-17694-2-git-send-email-geert+renesas@glider.be>
Date:	Wed, 10 Dec 2014 14:36:15 +0100
From:	Geert Uytterhoeven <geert+renesas@...der.be>
To:	Linus Walleij <linus.walleij@...aro.org>,
	Alexandre Courbot <gnurou@...il.com>,
	Thomas Gleixner <tglx@...utronix.de>
Cc:	Santosh Shilimkar <santosh.shilimkar@...com>,
	Ingo Molnar <mingo@...hat.com>, linux-gpio@...r.kernel.org,
	linux-sh@...r.kernel.org, linux-kernel@...r.kernel.org,
	Geert Uytterhoeven <geert+renesas@...der.be>
Subject: [PATCH 2/2] [RFC] genirq: Set IRQCHIP_SKIP_SET_WAKE for no_irq_chip and dummy_irq_chip

If no_irq_chip or dummy_irq_chip are used for wake up (e.g. gpio-keys
with a simple GPIO controller), the following warning is printed on
resume from s2ram:

    WANING: CPU: 0 PID: 1046 at kernel/irq/manage.c:537 irq_set_irq_wake+0x9c/0xf8()
    Unbalanced IRQ 113 wake disable

This happens because no_irq_chip and dummy_irq_chip do not implement
irq_chip.irq_set_wake(), causing set_irq_wake_real() to return -ENXIO,
and irq_set_irq_wake() to reset the wake_depth to zero.

Set IRQCHIP_SKIP_SET_WAKE to indicate that irq_chip.irq_set_wake() is
not implemented.

Signed-off-by: Geert Uytterhoeven <geert+renesas@...der.be>
---
Alternatively, can't we remove IRQCHIP_SKIP_SET_WAKE, and just check for
the presence of irq_chip.irq_set_wake()?
I'll be happy to send a patch to do that instead...

Is there anything that relies on this -ENXIO error code?
All irq_chip implementations that set IRQCHIP_SKIP_SET_WAKE do not
implement irq_chip.irq_set_wake(). There are probably more of them that
forgot to set IRQCHIP_SKIP_SET_WAKE though.
Am I missing something?
Commit 60f96b41f71d2a13 ("genirq: Add IRQCHIP_SKIP_SET_WAKE flag")
doesn't explain why adding the flag was chosen.

Thanks!
---
 kernel/irq/dummychip.c | 2 ++
 1 file changed, 2 insertions(+)

diff --git a/kernel/irq/dummychip.c b/kernel/irq/dummychip.c
index 988dc58e8847f6eb..326a67f2410bf95c 100644
--- a/kernel/irq/dummychip.c
+++ b/kernel/irq/dummychip.c
@@ -42,6 +42,7 @@ struct irq_chip no_irq_chip = {
 	.irq_enable	= noop,
 	.irq_disable	= noop,
 	.irq_ack	= ack_bad,
+	.flags		= IRQCHIP_SKIP_SET_WAKE,
 };

 /*
@@ -57,5 +58,6 @@ struct irq_chip dummy_irq_chip = {
 	.irq_ack	= noop,
 	.irq_mask	= noop,
 	.irq_unmask	= noop,
+	.flags		= IRQCHIP_SKIP_SET_WAKE,
 };
 EXPORT_SYMBOL_GPL(dummy_irq_chip);
-- 
1.9.1

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