linux-kernel - [PATCH] regmap-irq: set IRQF_ONESHOT flag to ensure IRQ request

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Date:	Wed, 11 Feb 2015 15:55:28 +0100
From:	Valentin Rothberg <Valentin.Rothberg@...6.fr>
To:	broonie@...nel.org, gregkh@...uxfoundation.org
Cc:	linux-kernel@...r.kernel.org,
	Valentin Rothberg <valentinrothberg@...il.com>,
	Valentin Rothberg <Valentin.Rothberg@...6.fr>
Subject: [PATCH] regmap-irq: set IRQF_ONESHOT flag to ensure IRQ request

From: Valentin Rothberg <valentinrothberg@...il.com>

Since commit 1c6c69525b40eb76de8adf039409722015927dc3 ("genirq: Reject
bogus threaded irq requests") threaded IRQs without a primary handler
need to be requested with IRQF_ONESHOT, otherwise the request will fail.

The %irq_flags flag is used to request the threaded IRQ and is also a
parameter of the caller.  Hence, we cannot be sure that IRQF_ONESHOT is
set.  This change avoids the potentially missing flag by setting
IRQF_ONESHOT when requesting the threaded IRQ.

Generated by: scripts/coccinelle/misc/irqf_oneshot.cocci

Signed-off-by: Valentin Rothberg <Valentin.Rothberg@...6.fr>
---
 drivers/base/regmap/regmap-irq.c | 3 ++-
 1 file changed, 2 insertions(+), 1 deletion(-)

diff --git a/drivers/base/regmap/regmap-irq.c b/drivers/base/regmap/regmap-irq.c
index 6299a50..a6c3f75 100644
--- a/drivers/base/regmap/regmap-irq.c
+++ b/drivers/base/regmap/regmap-irq.c
@@ -499,7 +499,8 @@ int regmap_add_irq_chip(struct regmap *map, int irq, int irq_flags,
 		goto err_alloc;
 	}
 
-	ret = request_threaded_irq(irq, NULL, regmap_irq_thread, irq_flags,
+	ret = request_threaded_irq(irq, NULL, regmap_irq_thread,
+				   irq_flags | IRQF_ONESHOT,
 				   chip->name, d);
 	if (ret != 0) {
 		dev_err(map->dev, "Failed to request IRQ %d for %s: %d\n",
-- 
1.9.1

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