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iio: percolate error if event fd fails

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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 events on the
erroneous (negative) file descriptor.

Signed-off-by: Linus Walleij <linus.walleij@linaro.org>
Acked-by: Daniel Baluta <daniel.baluta@intel.com>
Signed-off-by: Jonathan Cameron <jic23@kernel.org>
This commit is contained in:
Linus Walleij 2015-08-11 11:56:40 +02:00 committed by Jonathan Cameron
parent 53dabafe1b
commit 3f9059b717
1 changed files with 2 additions and 0 deletions
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2
drivers/iio/industrialio-core.c
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@ -1153,6 +1153,8 @@ 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;