pinctrl: exynos: Add spinlocks to irq_mask and irq_unmask

The patch:
  19846950 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@chromium.org>
Acked-by: Tomasz Figa <t.figa@samsung.com>
Acked-by: Kukjin Kim <kgene.kim@samsung.com>
Signed-off-by: Linus Walleij <linus.walleij@linaro.org>

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)