gpio/langwell: re-read the IRQ status register after each iteration

The IRQ status register should be re-read after each iteration.
Otherwise the loop misses the interrupt if it gets raised immediately
after handled.

Reported-by: Grant Likely <grant.likely@secretlab.ca>
Signed-off-by: Mika Westerberg <mika.westerberg@linux.intel.com>
Acked-by: Linus Walleij <linus.walleij@linaro.org>
Signed-off-by: Grant Likely <grant.likely@secretlab.ca>

diff --git a/drivers/gpio/gpio-langwell.c b/drivers/gpio/gpio-langwell.c
index b0673574dc700c851a72415212577a7ab4610d6b..a1c8754f52cf1b523c3da1bb9e572dc084ddde0b 100644 (file)
--- a/drivers/gpio/gpio-langwell.c
+++ b/drivers/gpio/gpio-langwell.c
@@ -250,11 +250,9 @@ static void lnw_irq_handler(unsigned irq, struct irq_desc *desc)
        /* check GPIO controller to check which pin triggered the interrupt */
        for (base = 0; base < lnw->chip.ngpio; base += 32) {
                gedr = gpio_reg(&lnw->chip, base, GEDR);
-               pending = readl(gedr);
-               while (pending) {
+               while ((pending = readl(gedr))) {
                        gpio = __ffs(pending);
                        mask = BIT(gpio);
-                       pending &= ~mask;
                        /* Clear before handling so we can't lose an edge */
                        writel(mask, gedr);
                        generic_handle_irq(irq_find_mapping(lnw->domain,