summaryrefslogtreecommitdiff
path: root/drivers/iio/industrialio-event.c
diff options
context:
space:
mode:
authorLars-Peter Clausen <lars@metafoo.de>2013-10-04 15:06:00 +0400
committerJonathan Cameron <jic23@kernel.org>2013-10-12 15:04:17 +0400
commitf18e7a068a0a31250cdb251810f8f6224931c3f5 (patch)
tree9692a94465954c615370dec9cd82baeb4387a211 /drivers/iio/industrialio-event.c
parent9e69c935fad9fd5f0550c51e3bd251cd30033136 (diff)
downloadlinux-f18e7a068a0a31250cdb251810f8f6224931c3f5.tar.xz
iio: Return -ENODEV for file operations if the device has been unregistered
If the IIO device has been unregistered return -ENODEV for any further file operations like read() and ioctl(). This avoids userspace being able to grab new references to the device. Signed-off-by: Lars-Peter Clausen <lars@metafoo.de> Signed-off-by: Jonathan Cameron <jic23@kernel.org>
Diffstat (limited to 'drivers/iio/industrialio-event.c')
-rw-r--r--drivers/iio/industrialio-event.c6
1 files changed, 6 insertions, 0 deletions
diff --git a/drivers/iio/industrialio-event.c b/drivers/iio/industrialio-event.c
index 36f0c8e0eb3d..837d450457dd 100644
--- a/drivers/iio/industrialio-event.c
+++ b/drivers/iio/industrialio-event.c
@@ -76,6 +76,9 @@ static unsigned int iio_event_poll(struct file *filep,
struct iio_event_interface *ev_int = indio_dev->event_interface;
unsigned int events = 0;
+ if (!indio_dev->info)
+ return -ENODEV;
+
poll_wait(filep, &ev_int->wait, wait);
spin_lock_irq(&ev_int->wait.lock);
@@ -96,6 +99,9 @@ static ssize_t iio_event_chrdev_read(struct file *filep,
unsigned int copied;
int ret;
+ if (!indio_dev->info)
+ return -ENODEV;
+
if (count < sizeof(struct iio_event_data))
return -EINVAL;