diff options
author | Lars-Peter Clausen <lars@metafoo.de> | 2013-10-04 12:07:00 +0100 |
---|---|---|
committer | Jonathan Cameron <jic23@kernel.org> | 2013-10-12 12:05:36 +0100 |
commit | d2f0a48f36aea38e0a5c4b439d5d9c96aecabad9 (patch) | |
tree | 2bc65afab0101f23f9e31e44500b858444c6d100 /drivers/iio/industrialio-buffer.c | |
parent | f18e7a068a0a31250cdb251810f8f6224931c3f5 (diff) | |
download | linux-next-d2f0a48f36aea38e0a5c4b439d5d9c96aecabad9.tar.gz |
iio: Wakeup poll and blocking reads when the device is unregistered
Once the device has been unregistered there won't be any new data no matter how
long a userspace application waits, so we might as well wake them up and let
them know.
Signed-off-by: Lars-Peter Clausen <lars@metafoo.de>
Signed-off-by: Jonathan Cameron <jic23@kernel.org>
Diffstat (limited to 'drivers/iio/industrialio-buffer.c')
-rw-r--r-- | drivers/iio/industrialio-buffer.c | 16 |
1 files changed, 16 insertions, 0 deletions
diff --git a/drivers/iio/industrialio-buffer.c b/drivers/iio/industrialio-buffer.c index 6c7a9c509399..5a46c57a038b 100644 --- a/drivers/iio/industrialio-buffer.c +++ b/drivers/iio/industrialio-buffer.c @@ -20,6 +20,7 @@ #include <linux/cdev.h> #include <linux/slab.h> #include <linux/poll.h> +#include <linux/sched.h> #include <linux/iio/iio.h> #include "iio_core.h" @@ -75,6 +76,21 @@ unsigned int iio_buffer_poll(struct file *filp, return 0; } +/** + * iio_buffer_wakeup_poll - Wakes up the buffer waitqueue + * @indio_dev: The IIO device + * + * Wakes up the event waitqueue used for poll(). Should usually + * be called when the device is unregistered. + */ +void iio_buffer_wakeup_poll(struct iio_dev *indio_dev) +{ + if (!indio_dev->buffer) + return; + + wake_up(&indio_dev->buffer->pollq); +} + void iio_buffer_init(struct iio_buffer *buffer) { INIT_LIST_HEAD(&buffer->demux_list); |