linux-kernel - [PATCH 1/3] pinctrl: exynos: Add spinlocks to irq_mask and irq

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Date:	Wed, 12 Jun 2013 10:33:17 -0700
From:	Doug Anderson <dianders@...omium.org>
To:	Linus Walleij <linus.walleij@...aro.org>
Cc:	Kukjin Kim <kgene.kim@...sung.com>,
	Tomasz Figa <tomasz.figa@...il.com>,
	Olof Johansson <olof@...om.net>,
	Simon Glass <sjg@...omium.org>,
	Luigi Semenzato <semenzato@...omium.org>,
	ilho215.lee@...sung.com, eunki_kim@...sung.com,
	Doug Anderson <dianders@...omium.org>,
	linux-kernel@...r.kernel.org
Subject: [PATCH 1/3] pinctrl: exynos: Add spinlocks to irq_mask and irq_unmask

The patch:
  1984695 pinctrl: samsung: Protect bank registers with a spinlock

...added spinlocks to protect many accesses.  However, the irq_mask
and irq_unmask functions still do an unprotected read/modify/write.
Add the spinlock there.

Signed-off-by: Doug Anderson <dianders@...omium.org>
---
 drivers/pinctrl/pinctrl-exynos.c | 20 ++++++++++++++++++++
 1 file changed, 20 insertions(+)

diff --git a/drivers/pinctrl/pinctrl-exynos.c b/drivers/pinctrl/pinctrl-exynos.c
index 2d76f66..c29a28e 100644
--- a/drivers/pinctrl/pinctrl-exynos.c
+++ b/drivers/pinctrl/pinctrl-exynos.c
@@ -56,10 +56,15 @@ static void exynos_gpio_irq_unmask(struct irq_data *irqd)
 	struct samsung_pinctrl_drv_data *d = bank->drvdata;
 	unsigned long reg_mask = d->ctrl->geint_mask + bank->eint_offset;
 	unsigned long mask;
+	unsigned long flags;
+
+	spin_lock_irqsave(&bank->slock, flags);
 
 	mask = readl(d->virt_base + reg_mask);
 	mask &= ~(1 << irqd->hwirq);
 	writel(mask, d->virt_base + reg_mask);
+
+	spin_unlock_irqrestore(&bank->slock, flags);
 }
 
 static void exynos_gpio_irq_mask(struct irq_data *irqd)
@@ -68,10 +73,15 @@ static void exynos_gpio_irq_mask(struct irq_data *irqd)
 	struct samsung_pinctrl_drv_data *d = bank->drvdata;
 	unsigned long reg_mask = d->ctrl->geint_mask + bank->eint_offset;
 	unsigned long mask;
+	unsigned long flags;
+
+	spin_lock_irqsave(&bank->slock, flags);
 
 	mask = readl(d->virt_base + reg_mask);
 	mask |= 1 << irqd->hwirq;
 	writel(mask, d->virt_base + reg_mask);
+
+	spin_unlock_irqrestore(&bank->slock, flags);
 }
 
 static void exynos_gpio_irq_ack(struct irq_data *irqd)
@@ -264,10 +274,15 @@ static void exynos_wkup_irq_unmask(struct irq_data *irqd)
 	struct samsung_pinctrl_drv_data *d = b->drvdata;
 	unsigned long reg_mask = d->ctrl->weint_mask + b->eint_offset;
 	unsigned long mask;
+	unsigned long flags;
+
+	spin_lock_irqsave(&b->slock, flags);
 
 	mask = readl(d->virt_base + reg_mask);
 	mask &= ~(1 << irqd->hwirq);
 	writel(mask, d->virt_base + reg_mask);
+
+	spin_unlock_irqrestore(&b->slock, flags);
 }
 
 static void exynos_wkup_irq_mask(struct irq_data *irqd)
@@ -276,10 +291,15 @@ static void exynos_wkup_irq_mask(struct irq_data *irqd)
 	struct samsung_pinctrl_drv_data *d = b->drvdata;
 	unsigned long reg_mask = d->ctrl->weint_mask + b->eint_offset;
 	unsigned long mask;
+	unsigned long flags;
+
+	spin_lock_irqsave(&b->slock, flags);
 
 	mask = readl(d->virt_base + reg_mask);
 	mask |= 1 << irqd->hwirq;
 	writel(mask, d->virt_base + reg_mask);
+
+	spin_unlock_irqrestore(&b->slock, flags);
 }
 
 static void exynos_wkup_irq_ack(struct irq_data *irqd)
-- 
1.8.3

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