From: Jonathan Cameron <jic23@xxxxxxxxxx> Implements poll system call support on IIO Kfifo buffers. Acked-by: srinivas pandruvada <srinivas.pandruvada@xxxxxxxxx> --- drivers/iio/kfifo_buf.c | 9 +++++++++ 1 files changed, 9 insertions(+), 0 deletions(-) diff --git a/drivers/iio/kfifo_buf.c b/drivers/iio/kfifo_buf.c index 6bf9d05..e8033a4 100644 --- a/drivers/iio/kfifo_buf.c +++ b/drivers/iio/kfifo_buf.c @@ -6,6 +6,7 @@ #include <linux/kfifo.h> #include <linux/mutex.h> #include <linux/iio/kfifo_buf.h> +#include <linux/sched.h> struct iio_kfifo { struct iio_buffer buffer; @@ -35,6 +36,7 @@ static int iio_request_update_kfifo(struct iio_buffer *r) kfifo_free(&buf->kf); ret = __iio_allocate_kfifo(buf, buf->buffer.bytes_per_datum, buf->buffer.length); + r->stufftoread = false; error_ret: return ret; } @@ -97,6 +99,8 @@ static int iio_store_to_kfifo(struct iio_buffer *r, ret = kfifo_in(&kf->kf, data, r->bytes_per_datum); if (ret != r->bytes_per_datum) return -EBUSY; + r->stufftoread = true; + wake_up_interruptible(&r->pollq); return 0; } @@ -111,6 +115,11 @@ static int iio_read_first_n_kfifo(struct iio_buffer *r, n = rounddown(n, r->bytes_per_datum); ret = kfifo_to_user(&kf->kf, buf, n, &copied); + if (kfifo_is_empty(&kf->kf)) + r->stufftoread = false; + /* verify it is still empty to avoid race */ + if (!kfifo_is_empty(&kf->kf)) + r->stufftoread = true; return copied; } -- 1.7.7.6 -- To unsubscribe from this list: send the line "unsubscribe linux-iio" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html