linux-kernel - [RFC PATCH 2/4] iio: hw_consumer: use new scanmask functions

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Date:   Fri, 24 Apr 2020 08:18:16 +0300
From:   Alexandru Ardelean <alexandru.ardelean@...log.com>
To:     <linux-iio@...r.kernel.org>, <linux-kernel@...r.kernel.org>
CC:     <jic23@...nel.org>, <lars@...afoo.de>,
        Alexandru Ardelean <alexandru.ardelean@...log.com>
Subject: [RFC PATCH 2/4] iio: hw_consumer: use new scanmask functions

From: Lars-Peter Clausen <lars@...afoo.de>

This change moves the handling of the scanmasks to the new wrapper
functions that were added in a previous commit.

Signed-off-by: Lars-Peter Clausen <lars@...afoo.de>
Signed-off-by: Alexandru Ardelean <alexandru.ardelean@...log.com>
---
 drivers/iio/buffer/industrialio-hw-consumer.c | 19 ++++++++++++++-----
 1 file changed, 14 insertions(+), 5 deletions(-)

diff --git a/drivers/iio/buffer/industrialio-hw-consumer.c b/drivers/iio/buffer/industrialio-hw-consumer.c
index f2d27788f666..f1cc72520685 100644
--- a/drivers/iio/buffer/industrialio-hw-consumer.c
+++ b/drivers/iio/buffer/industrialio-hw-consumer.c
@@ -28,7 +28,6 @@ struct hw_consumer_buffer {
 	struct list_head head;
 	struct iio_dev *indio_dev;
 	struct iio_buffer buffer;
-	long scan_mask[];
 };
 
 static struct hw_consumer_buffer *iio_buffer_to_hw_consumer_buffer(
@@ -41,6 +40,8 @@ static void iio_hw_buf_release(struct iio_buffer *buffer)
 {
 	struct hw_consumer_buffer *hw_buf =
 		iio_buffer_to_hw_consumer_buffer(buffer);
+
+	iio_buffer_free_scanmask(buffer);
 	kfree(hw_buf);
 }
 
@@ -52,26 +53,34 @@ static const struct iio_buffer_access_funcs iio_hw_buf_access = {
 static struct hw_consumer_buffer *iio_hw_consumer_get_buffer(
 	struct iio_hw_consumer *hwc, struct iio_dev *indio_dev)
 {
-	size_t mask_size = BITS_TO_LONGS(indio_dev->masklength) * sizeof(long);
 	struct hw_consumer_buffer *buf;
+	int ret;
 
 	list_for_each_entry(buf, &hwc->buffers, head) {
 		if (buf->indio_dev == indio_dev)
 			return buf;
 	}
 
-	buf = kzalloc(sizeof(*buf) + mask_size, GFP_KERNEL);
+	buf = kzalloc(sizeof(*buf), GFP_KERNEL);
 	if (!buf)
 		return NULL;
 
 	buf->buffer.access = &iio_hw_buf_access;
 	buf->indio_dev = indio_dev;
-	buf->buffer.scan_mask = buf->scan_mask;
 
 	iio_buffer_init(&buf->buffer);
+
+	ret = iio_buffer_alloc_scanmask(&buf->buffer, indio_dev);
+	if (ret)
+		goto err_free_buf;
+
 	list_add_tail(&buf->head, &hwc->buffers);
 
 	return buf;
+
+err_free_buf:
+	kfree(buf);
+	return NULL;
 }
 
 /**
@@ -106,7 +115,7 @@ struct iio_hw_consumer *iio_hw_consumer_alloc(struct device *dev)
 			ret = -ENOMEM;
 			goto err_put_buffers;
 		}
-		set_bit(chan->channel->scan_index, buf->buffer.scan_mask);
+		iio_buffer_channel_enable(&buf->buffer, chan);
 		chan++;
 	}
 
-- 
2.17.1