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gpio: fixup line flags for userspace ABI

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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>
This commit is contained in:
Linus Walleij 2016-02-22 13:44:53 +01:00
parent 2307f3aab8
commit 9d8cc89c31
1 changed files with 9 additions and 7 deletions
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16
drivers/gpio/gpiolib.c
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@ -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)))