linux-kernel - [PATCH 5/7] gpio: dwapb: use irq_gc_lock() for locking instead bc's lock

lists.openwall.net		lists / announce owl-users owl-dev john-users john-dev passwdqc-users yescrypt popa3d-users / oss-security kernel-hardening musl sabotage tlsify passwords / crypt-dev xvendor / Bugtraq Full-Disclosure linux-kernel linux-netdev linux-ext4 linux-hardening linux-cve-announce PHC
Open Source and information security mailing list archives

Hash Suite: Windows password security audit tool. GUI, reports in PDF.

[<prev] [next>] [<thread-prev] [thread-next>] [day] [month] [year] [list]

Date:	Sat, 22 Mar 2014 17:16:42 +0100
From:	Sebastian Andrzej Siewior <bigeasy@...utronix.de>
To:	atull@...era.com
Cc:	linus.walleij@...aro.org, gnurou@...il.com,
	linux-gpio@...r.kernel.org, linux-kernel@...r.kernel.org,
	dinguyen@...era.com, delicious.quinoa@...il.com,
	Sebastian Andrzej Siewior <bigeasy@...utronix.de>
Subject: [PATCH 5/7] gpio: dwapb: use irq_gc_lock() for locking instead bc's  lock

The generic irq chip uses irq_gc_lock() for locking so the
enable/startup and type callbacks should use the same lock. None of
those registers (polarity, mask, enable) are used by the gpio part.

Signed-off-by: Sebastian Andrzej Siewior <bigeasy@...utronix.de>
---
 drivers/gpio/gpio-dwapb.c | 20 +++++++-------------
 1 file changed, 7 insertions(+), 13 deletions(-)

diff --git a/drivers/gpio/gpio-dwapb.c b/drivers/gpio/gpio-dwapb.c
index 541b893..752ccb1 100644
--- a/drivers/gpio/gpio-dwapb.c
+++ b/drivers/gpio/gpio-dwapb.c
@@ -20,7 +20,6 @@
 #include <linux/of_address.h>
 #include <linux/of_irq.h>
 #include <linux/platform_device.h>
-#include <linux/spinlock.h>
 
 #define GPIO_SWPORTA_DR		0x00
 #define GPIO_SWPORTA_DDR	0x04
@@ -110,30 +109,26 @@ static void dwapb_irq_enable(struct irq_data *d)
 {
 	struct irq_chip_generic *igc = irq_data_get_irq_chip_data(d);
 	struct dwapb_gpio *gpio = igc->private;
-	struct bgpio_chip *bgc = &gpio->ports[0].bgc;
-	unsigned long flags;
 	u32 val;
 
-	spin_lock_irqsave(&bgc->lock, flags);
+	irq_gc_lock(igc);
 	val = readl(gpio->regs + GPIO_INTEN);
 	val |= BIT(d->hwirq);
 	writel(val, gpio->regs + GPIO_INTEN);
-	spin_unlock_irqrestore(&bgc->lock, flags);
+	irq_gc_unlock(igc);
 }
 
 static void dwapb_irq_disable(struct irq_data *d)
 {
 	struct irq_chip_generic *igc = irq_data_get_irq_chip_data(d);
 	struct dwapb_gpio *gpio = igc->private;
-	struct bgpio_chip *bgc = &gpio->ports[0].bgc;
-	unsigned long flags;
 	u32 val;
 
-	spin_lock_irqsave(&bgc->lock, flags);
+	irq_gc_lock(igc);
 	val = readl(gpio->regs + GPIO_INTEN);
 	val &= ~BIT(d->hwirq);
 	writel(val, gpio->regs + GPIO_INTEN);
-	spin_unlock_irqrestore(&bgc->lock, flags);
+	irq_gc_unlock(igc);
 }
 
 static int dwapb_irq_reqres(struct irq_data *d)
@@ -163,15 +158,14 @@ static int dwapb_irq_set_type(struct irq_data *d, u32 type)
 {
 	struct irq_chip_generic *igc = irq_data_get_irq_chip_data(d);
 	struct dwapb_gpio *gpio = igc->private;
-	struct bgpio_chip *bgc = &gpio->ports[0].bgc;
 	int bit = d->hwirq;
-	unsigned long level, polarity, flags;
+	unsigned long level, polarity;
 
 	if (type & ~(IRQ_TYPE_EDGE_RISING | IRQ_TYPE_EDGE_FALLING |
 		     IRQ_TYPE_LEVEL_HIGH | IRQ_TYPE_LEVEL_LOW))
 		return -EINVAL;
 
-	spin_lock_irqsave(&bgc->lock, flags);
+	irq_gc_lock(igc);
 	level = readl(gpio->regs + GPIO_INTTYPE_LEVEL);
 	polarity = readl(gpio->regs + GPIO_INT_POLARITY);
 
@@ -200,7 +194,7 @@ static int dwapb_irq_set_type(struct irq_data *d, u32 type)
 
 	writel(level, gpio->regs + GPIO_INTTYPE_LEVEL);
 	writel(polarity, gpio->regs + GPIO_INT_POLARITY);
-	spin_unlock_irqrestore(&bgc->lock, flags);
+	irq_gc_unlock(igc);
 
 	return 0;
 }
-- 
1.9.1

--
To unsubscribe from this list: send the line "unsubscribe linux-kernel" in
the body of a message to majordomo@...r.kernel.org
More majordomo info at  http://vger.kernel.org/majordomo-info.html
Please read the FAQ at  http://www.tux.org/lkml/