According to Braswell NDA Specification Update (#557593), concurrent read accesses may result in returning 0xffffffff and write instructions may be dropped. We have an established format for the commit references, i.e. cdca06e4e859 ("pinctrl: baytrail: Add missing spinlock usage in byt_gpio_irq_handler") Signed-off-by: Grace Kao <grace.kao@xxxxxxxxx> Reported-by: Brian Norris <briannorris@xxxxxxxxxxxx> Reviewed-by: Brian Norris <briannorris@xxxxxxxxxxxx> --- drivers/pinctrl/intel/pinctrl-cherryview.c | 4 ++++ 1 file changed, 4 insertions(+) diff --git a/drivers/pinctrl/intel/pinctrl-cherryview.c b/drivers/pinctrl/intel/pinctrl-cherryview.c index 4c74fdde576d..1093a6105d40 100644 --- a/drivers/pinctrl/intel/pinctrl-cherryview.c +++ b/drivers/pinctrl/intel/pinctrl-cherryview.c @@ -1479,11 +1479,15 @@ static void chv_gpio_irq_handler(struct irq_desc *desc) struct chv_pinctrl *pctrl = gpiochip_get_data(gc); struct irq_chip *chip = irq_desc_get_chip(desc); unsigned long pending; + unsigned long flags; u32 intr_line; chained_irq_enter(chip, desc); + raw_spin_lock_irqsave(&chv_lock, flags); pending = readl(pctrl->regs + CHV_INTSTAT); + raw_spin_unlock_irqrestore(&chv_lock, flags); + for_each_set_bit(intr_line, &pending, pctrl->community->nirqs) { unsigned int irq, offset; -- 2.17.1