On Tue, Aug 11, 2015 at 12:56 PM, Linus Walleij
<linus.walleij@xxxxxxxxxx> wrote:
> This makes the error from iio_event_getfd() percolate up
> to userspace properly so we can know for sure there is no
> events on this device (-ENODEV returned). Before this patch
> we would bail out looking for the unsupported evens on the
> erroneous (negative) file descriptor.
Good catch. s/evens/events
>
> Signed-off-by: Linus Walleij <linus.walleij@xxxxxxxxxx>
Acked-by: Daniel Baluta <daniel.baluta@xxxxxxxxx>
> ---
> drivers/iio/industrialio-core.c | 2 ++
> 1 file changed, 2 insertions(+)
>
> diff --git a/drivers/iio/industrialio-core.c b/drivers/iio/industrialio-core.c
> index 3524b0de8721..9492aa443a26 100644
> --- a/drivers/iio/industrialio-core.c
> +++ b/drivers/iio/industrialio-core.c
> @@ -1130,6 +1130,8 @@ static long iio_ioctl(struct file *filp, unsigned int cmd, unsigned long arg)
>
> if (cmd == IIO_GET_EVENT_FD_IOCTL) {
> fd = iio_event_getfd(indio_dev);
> + if (fd < 0)
> + return fd;
> if (copy_to_user(ip, &fd, sizeof(fd)))
> return -EFAULT;
> return 0;
> --
> 2.4.3
>
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