Commit 355c1a14 authored by Lars-Peter Clausen's avatar Lars-Peter Clausen Committed by Jonathan Cameron
Browse files

iio: kfifo_buf: Implement data_available() callback 



This patch implements the data_available() callback for the kfifo buffer instead
of using the stufftoread flag. The kfifo used by the buffer already knows
whether it is empty or not based on the position of its read and write pointer.
Using this makes it a lot easier to tell whether data is available or not and it
is not necessary to take special measures to ensure that no race conditions
between reading and writing from the buffer occur.

Note, that we still have to take the buffers lock to protect against concurrent
resizeing of the kfifo.

Signed-off-by: default avatarLars-Peter Clausen <lars@metafoo.de>
Signed-off-by: default avatarJonathan Cameron <jic23@kernel.org>
parent 647cc7b9

drivers/iio/kfifo_buf.c

+14 −9
Original line number Diff line number Diff line
@@ -42,7 +42,6 @@ static int iio_request_update_kfifo(struct iio_buffer *r) 
	} else {

		kfifo_reset_out(&buf->kf);

	}

	r->stufftoread = false;

	mutex_unlock(&buf->user_lock);



	return ret;
@@ -108,7 +107,7 @@ static int iio_store_to_kfifo(struct iio_buffer *r, 
	ret = kfifo_in(&kf->kf, data, 1);

	if (ret != 1)

		return -EBUSY;

	r->stufftoread = true;



	wake_up_interruptible_poll(&r->pollq, POLLIN | POLLRDNORM);



	return 0;
@@ -127,13 +126,6 @@ static int iio_read_first_n_kfifo(struct iio_buffer *r, 
		ret = -EINVAL;

	else

		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;



	mutex_unlock(&kf->user_lock);

	if (ret < 0)

		return ret;
@@ -141,6 +133,18 @@ static int iio_read_first_n_kfifo(struct iio_buffer *r, 
	return copied;

}



static bool iio_kfifo_buf_data_available(struct iio_buffer *r)

{

	struct iio_kfifo *kf = iio_to_kfifo(r);

	bool empty;



	mutex_lock(&kf->user_lock);

	empty = kfifo_is_empty(&kf->kf);

	mutex_unlock(&kf->user_lock);



	return !empty;

}



static void iio_kfifo_buffer_release(struct iio_buffer *buffer)

{

	struct iio_kfifo *kf = iio_to_kfifo(buffer);
@@ -153,6 +157,7 @@ static void iio_kfifo_buffer_release(struct iio_buffer *buffer) 
static const struct iio_buffer_access_funcs kfifo_access_funcs = {

	.store_to = &iio_store_to_kfifo,

	.read_first_n = &iio_read_first_n_kfifo,

	.data_available = iio_kfifo_buf_data_available,

	.request_update = &iio_request_update_kfifo,

	.get_bytes_per_datum = &iio_get_bytes_per_datum_kfifo,

	.set_bytes_per_datum = &iio_set_bytes_per_datum_kfifo,

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