gpio: fixup line flags for userspace ABI

This fixes the wrongly indicated lines in the userspace
ABI: test for the right BITS, do not treat bit numbers as
bitmasks.

Reported-by: Markus Pargmann <mpa@pengutronix.de>
Signed-off-by: Linus Walleij <linus.walleij@linaro.org>

1 files changed, 9 insertions, 7 deletions

diff --git a/drivers/gpio/gpiolib.c b/drivers/gpio/gpiolib.c
index b81646982375..872774a404f1 100644
--- a/drivers/gpio/gpiolib.c
+++ b/drivers/gpio/gpiolib.c
@@ -380,17 +380,19 @@ static long gpio_ioctl(struct file *filp, unsigned int cmd, unsigned long arg)
                  * this GPIO so it can't use it.
                  */
                 lineinfo.flags = 0;
-                if (desc->flags & (FLAG_REQUESTED | FLAG_IS_HOGGED |
-                                   FLAG_USED_AS_IRQ | FLAG_EXPORT |
-                                   FLAG_SYSFS))
+                if (test_bit(FLAG_REQUESTED, &desc->flags) ||
+                    test_bit(FLAG_IS_HOGGED, &desc->flags) ||
+                    test_bit(FLAG_USED_AS_IRQ, &desc->flags) ||
+                    test_bit(FLAG_EXPORT, &desc->flags) ||
+                    test_bit(FLAG_SYSFS, &desc->flags))
                         lineinfo.flags |= GPIOLINE_FLAG_KERNEL;
-                if (desc->flags & FLAG_IS_OUT)
+                if (test_bit(FLAG_IS_OUT, &desc->flags))
                         lineinfo.flags |= GPIOLINE_FLAG_IS_OUT;
-                if (desc->flags & FLAG_ACTIVE_LOW)
+                if (test_bit(FLAG_ACTIVE_LOW, &desc->flags))
                         lineinfo.flags |= GPIOLINE_FLAG_ACTIVE_LOW;
-                if (desc->flags & FLAG_OPEN_DRAIN)
+                if (test_bit(FLAG_OPEN_DRAIN, &desc->flags))
                         lineinfo.flags |= GPIOLINE_FLAG_OPEN_DRAIN;
-                if (desc->flags & FLAG_OPEN_SOURCE)
+                if (test_bit(FLAG_OPEN_SOURCE, &desc->flags))
                         lineinfo.flags |= GPIOLINE_FLAG_OPEN_SOURCE;
 
                 if (copy_to_user(ip, &lineinfo, sizeof(lineinfo)))