pinctrl: lynxpoint: Use raw_spinlock for locking

The Intel Lynxpoint pinctrl driver implements irqchip callbacks which are
called with desc->lock raw_spinlock held. In mainline this is fine because
spinlock resolves to raw_spinlock. However, running the same code in -rt
we will get a BUG() asserted.

This is because in -rt spinlocks are preemptible so taking the driver
private spinlock in irqchip callbacks causes might_sleep() to trigger.

In order to keep -rt happy but at the same time make sure that register
accesses get serialized, convert the driver to use raw_spinlock instead.

Reviewed-by: Linus Walleij <linus.walleij@linaro.org>
Signed-off-by: Andy Shevchenko <andriy.shevchenko@linux.intel.com>
Acked-by: Mika Westerberg <mika.westerberg@linux.intel.com>

diff --git a/drivers/pinctrl/intel/pinctrl-lynxpoint.c b/drivers/pinctrl/intel/pinctrl-lynxpoint.c
index 490ce7b..c30fd86 100644 (file)
--- a/drivers/pinctrl/intel/pinctrl-lynxpoint.c
+++ b/drivers/pinctrl/intel/pinctrl-lynxpoint.c
@@ -47,7 +47,7 @@
 struct lp_gpio {
        struct gpio_chip        chip;
        struct platform_device  *pdev;
-       spinlock_t              lock;
+       raw_spinlock_t          lock;
        unsigned long           reg_base;
 };
 
@@ -144,7 +144,7 @@ static int lp_irq_type(struct irq_data *d, unsigned type)
        if (hwirq >= lg->chip.ngpio)
                return -EINVAL;
 
-       spin_lock_irqsave(&lg->lock, flags);
+       raw_spin_lock_irqsave(&lg->lock, flags);
        value = inl(reg);
 
        /* set both TRIG_SEL and INV bits to 0 for rising edge */
@@ -170,7 +170,7 @@ static int lp_irq_type(struct irq_data *d, unsigned type)
        else if (type & IRQ_TYPE_LEVEL_MASK)
                irq_set_handler_locked(d, handle_level_irq);
 
-       spin_unlock_irqrestore(&lg->lock, flags);
+       raw_spin_unlock_irqrestore(&lg->lock, flags);
 
        return 0;
 }
@@ -187,14 +187,14 @@ static void lp_gpio_set(struct gpio_chip *chip, unsigned offset, int value)
        unsigned long reg = lp_gpio_reg(chip, offset, LP_CONFIG1);
        unsigned long flags;
 
-       spin_lock_irqsave(&lg->lock, flags);
+       raw_spin_lock_irqsave(&lg->lock, flags);
 
        if (value)
                outl(inl(reg) | OUT_LVL_BIT, reg);
        else
                outl(inl(reg) & ~OUT_LVL_BIT, reg);
 
-       spin_unlock_irqrestore(&lg->lock, flags);
+       raw_spin_unlock_irqrestore(&lg->lock, flags);
 }
 
 static int lp_gpio_direction_input(struct gpio_chip *chip, unsigned offset)
@@ -203,9 +203,9 @@ static int lp_gpio_direction_input(struct gpio_chip *chip, unsigned offset)
        unsigned long reg = lp_gpio_reg(chip, offset, LP_CONFIG1);
        unsigned long flags;
 
-       spin_lock_irqsave(&lg->lock, flags);
+       raw_spin_lock_irqsave(&lg->lock, flags);
        outl(inl(reg) | DIR_BIT, reg);
-       spin_unlock_irqrestore(&lg->lock, flags);
+       raw_spin_unlock_irqrestore(&lg->lock, flags);
 
        return 0;
 }
@@ -219,9 +219,9 @@ static int lp_gpio_direction_output(struct gpio_chip *chip,
 
        lp_gpio_set(chip, offset, value);
 
-       spin_lock_irqsave(&lg->lock, flags);
+       raw_spin_lock_irqsave(&lg->lock, flags);
        outl(inl(reg) & ~DIR_BIT, reg);
-       spin_unlock_irqrestore(&lg->lock, flags);
+       raw_spin_unlock_irqrestore(&lg->lock, flags);
 
        return 0;
 }
@@ -272,9 +272,9 @@ static void lp_irq_enable(struct irq_data *d)
        unsigned long reg = lp_gpio_reg(&lg->chip, hwirq, LP_INT_ENABLE);
        unsigned long flags;
 
-       spin_lock_irqsave(&lg->lock, flags);
+       raw_spin_lock_irqsave(&lg->lock, flags);
        outl(inl(reg) | BIT(hwirq % 32), reg);
-       spin_unlock_irqrestore(&lg->lock, flags);
+       raw_spin_unlock_irqrestore(&lg->lock, flags);
 }
 
 static void lp_irq_disable(struct irq_data *d)
@@ -285,9 +285,9 @@ static void lp_irq_disable(struct irq_data *d)
        unsigned long reg = lp_gpio_reg(&lg->chip, hwirq, LP_INT_ENABLE);
        unsigned long flags;
 
-       spin_lock_irqsave(&lg->lock, flags);
+       raw_spin_lock_irqsave(&lg->lock, flags);
        outl(inl(reg) & ~BIT(hwirq % 32), reg);
-       spin_unlock_irqrestore(&lg->lock, flags);
+       raw_spin_unlock_irqrestore(&lg->lock, flags);
 }
 
 static struct irq_chip lp_irqchip = {
@@ -351,7 +351,7 @@ static int lp_gpio_probe(struct platform_device *pdev)
                return -EBUSY;
        }
 
-       spin_lock_init(&lg->lock);
+       raw_spin_lock_init(&lg->lock);
 
        gc = &lg->chip;
        gc->label = dev_name(dev);