linux-kernel - [PATCH 3.18 36/61] irqchip: atmel-aic-common: Prevent clobbering of priority when changing IRQ type

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Message-Id: <20150128012640.860886461@linuxfoundation.org>
Date:	Tue, 27 Jan 2015 17:26:48 -0800
From:	Greg Kroah-Hartman <gregkh@...uxfoundation.org>
To:	linux-kernel@...r.kernel.org
Cc:	Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
	stable@...r.kernel.org, Gavin Li <gavinli@...gavinli.com>,
	Boris Brezillon <boris.brezillon@...e-electrons.com>,
	Nicolas Ferre <nicolas.ferre@...el.com>,
	Jason Cooper <jason@...edaemon.net>
Subject: [PATCH 3.18 36/61] irqchip: atmel-aic-common: Prevent clobbering of priority when changing IRQ type

3.18-stable review patch.  If anyone has any objections, please let me know.

------------------

From: Gavin Li <git@...gavinli.com>

commit 91d1179212161f220938198b742c328ad38fd0a3 upstream.

This patch makes the bitmask for AIC_SRCTYPE consistent
with that of its valid values, and prevents the priority
field at bits 2:0 from being clobbered by an incorrect
AND with the AIC_SRCTYPE mask.

Signed-off-by: Gavin Li <gavinli@...gavinli.com>
Acked-by: Boris Brezillon <boris.brezillon@...e-electrons.com>
Acked-by: Nicolas Ferre <nicolas.ferre@...el.com>
Link: https://lkml.kernel.org/r/1420598843-8409-1-git-send-email-gavinli@thegavinli.com
Signed-off-by: Jason Cooper <jason@...edaemon.net>
Signed-off-by: Greg Kroah-Hartman <gregkh@...uxfoundation.org>

---
 drivers/irqchip/irq-atmel-aic-common.c |    4 ++--
 1 file changed, 2 insertions(+), 2 deletions(-)

--- a/drivers/irqchip/irq-atmel-aic-common.c
+++ b/drivers/irqchip/irq-atmel-aic-common.c
@@ -28,7 +28,7 @@
 #define AT91_AIC_IRQ_MIN_PRIORITY	0
 #define AT91_AIC_IRQ_MAX_PRIORITY	7
 
-#define AT91_AIC_SRCTYPE		GENMASK(7, 6)
+#define AT91_AIC_SRCTYPE		GENMASK(6, 5)
 #define AT91_AIC_SRCTYPE_LOW		(0 << 5)
 #define AT91_AIC_SRCTYPE_FALLING	(1 << 5)
 #define AT91_AIC_SRCTYPE_HIGH		(2 << 5)
@@ -74,7 +74,7 @@ int aic_common_set_type(struct irq_data
 		return -EINVAL;
 	}
 
-	*val &= AT91_AIC_SRCTYPE;
+	*val &= ~AT91_AIC_SRCTYPE;
 	*val |= aic_type;
 
 	return 0;


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