From fcce9f14f07db15650d84650293e2207f7dabbfa Mon Sep 17 00:00:00 2001 From: Andy Shevchenko Date: Mon, 11 Jul 2016 13:06:26 +0300 Subject: [PATCH] gpio: merrifield: Protect irq_ack() and gpio_set() by lock There is a potential race when two threads do the writes to the same register in parallel. Prevent out of order in such case by protecting I/O access by spin lock. Signed-off-by: Andy Shevchenko Signed-off-by: Linus Walleij --- drivers/gpio/gpio-merrifield.c | 11 +++++++++++ 1 file changed, 11 insertions(+) diff --git a/drivers/gpio/gpio-merrifield.c b/drivers/gpio/gpio-merrifield.c index 11066f6eb412..45b51278b8ee 100644 --- a/drivers/gpio/gpio-merrifield.c +++ b/drivers/gpio/gpio-merrifield.c @@ -105,7 +105,11 @@ static int mrfld_gpio_get(struct gpio_chip *chip, unsigned int offset) static void mrfld_gpio_set(struct gpio_chip *chip, unsigned int offset, int value) { + struct mrfld_gpio *priv = gpiochip_get_data(chip); void __iomem *gpsr, *gpcr; + unsigned long flags; + + raw_spin_lock_irqsave(&priv->lock, flags); if (value) { gpsr = gpio_reg(chip, offset, GPSR); @@ -114,6 +118,8 @@ static void mrfld_gpio_set(struct gpio_chip *chip, unsigned int offset, gpcr = gpio_reg(chip, offset, GPCR); writel(BIT(offset % 32), gpcr); } + + raw_spin_unlock_irqrestore(&priv->lock, flags); } static int mrfld_gpio_direction_input(struct gpio_chip *chip, @@ -160,8 +166,13 @@ static void mrfld_irq_ack(struct irq_data *d) struct mrfld_gpio *priv = irq_data_get_irq_chip_data(d); u32 gpio = irqd_to_hwirq(d); void __iomem *gisr = gpio_reg(&priv->chip, gpio, GISR); + unsigned long flags; + + raw_spin_lock_irqsave(&priv->lock, flags); writel(BIT(gpio % 32), gisr); + + raw_spin_unlock_irqrestore(&priv->lock, flags); } static void mrfld_irq_unmask_mask(struct irq_data *d, bool unmask)