gpio/grgpio: fix deadlock in grgpio_irq_unmap()

As reported by Alexey Khoroshilov:

    grgpio_irq_unmap() code looks quite suspicious regarding usage of
    priv->bgc.lock spinlock.

    It locks the spinlock in line 310:

	spin_lock_irqsave(&priv->bgc.lock, flags);

    and then it can call grgpio_set_imask() in line 317:

	grgpio_set_imask(priv, i, 0);

    But grgpio_set_imask() unconditionally locks the spinlock by itself.

Fix this by moving the spinlock acquisition outside of
grgpio_set_imask().

Found by Linux Driver Verification project (linuxtesting.org).

Reported-by: Alexey Khoroshilov <khoroshilov@ispras.ru>
Signed-off-by: Alexandre Courbot <acourbot@nvidia.com>
Cc: Alexey Khoroshilov <khoroshilov@ispras.ru>
Cc: Andreas Larsson <andreas@gaisler.com>
Signed-off-by: Linus Walleij <linus.walleij@linaro.org>

diff --git a/drivers/gpio/gpio-grgpio.c b/drivers/gpio/gpio-grgpio.c
index 77053d6..801423f 100644 (file)
--- a/drivers/gpio/gpio-grgpio.c
+++ b/drivers/gpio/gpio-grgpio.c
@@ -104,17 +104,12 @@ static void grgpio_set_imask(struct grgpio_priv *priv, unsigned int offset,
 {
        struct bgpio_chip *bgc = &priv->bgc;
        unsigned long mask = bgc->pin2mask(bgc, offset);
-       unsigned long flags;
-
-       spin_lock_irqsave(&bgc->lock, flags);
 
        if (val)
                priv->imask |= mask;
        else
                priv->imask &= ~mask;
        bgc->write_reg(priv->regs + GRGPIO_IMASK, priv->imask);
-
-       spin_unlock_irqrestore(&bgc->lock, flags);
 }
 
 static int grgpio_to_irq(struct gpio_chip *gc, unsigned offset)
@@ -180,16 +175,26 @@ static void grgpio_irq_mask(struct irq_data *d)
 {
        struct grgpio_priv *priv = irq_data_get_irq_chip_data(d);
        int offset = d->hwirq;
+       unsigned long flags;
+
+       spin_lock_irqsave(&priv->bgc.lock, flags);
 
        grgpio_set_imask(priv, offset, 0);
+
+       spin_unlock_irqrestore(&priv->bgc.lock, flags);
 }
 
 static void grgpio_irq_unmask(struct irq_data *d)
 {
        struct grgpio_priv *priv = irq_data_get_irq_chip_data(d);
        int offset = d->hwirq;
+       unsigned long flags;
+
+       spin_lock_irqsave(&priv->bgc.lock, flags);
 
        grgpio_set_imask(priv, offset, 1);
+
+       spin_unlock_irqrestore(&priv->bgc.lock, flags);
 }
 
 static struct irq_chip grgpio_irq_chip = {