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2023-12-08 01573e231f18eb2d99162747186f59511f56b64d

 kernel/drivers/iio/buffer/industrialio-buffer-cb.c
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@@ -1,8 +1,5 @@
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+// SPDX-License-Identifier: GPL-2.0-only
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 /* The industrial I/O callback buffer
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- *
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- * This program is free software; you can redistribute it and/or modify it
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- * under the terms of the GNU General Public License version 2 as published by
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- * the Free Software Foundation.
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  */
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4
 
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 #include <linux/kernel.h>
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@@ -36,7 +33,8 @@
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 static void iio_buffer_cb_release(struct iio_buffer *buffer)
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 {
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 	struct iio_cb_buffer *cb_buff = buffer_to_cb_buffer(buffer);
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-	kfree(cb_buff->buffer.scan_mask);
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+
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+	bitmap_free(cb_buff->buffer.scan_mask);
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 	kfree(cb_buff);
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 }
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@@ -74,9 +72,8 @@
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 	}
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 	cb_buff->indio_dev = cb_buff->channels[0].indio_dev;
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-	cb_buff->buffer.scan_mask
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-		= kcalloc(BITS_TO_LONGS(cb_buff->indio_dev->masklength),
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-			  sizeof(long), GFP_KERNEL);
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+	cb_buff->buffer.scan_mask = bitmap_zalloc(cb_buff->indio_dev->masklength,
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+						  GFP_KERNEL);
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 	if (cb_buff->buffer.scan_mask == NULL) {
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 		ret = -ENOMEM;
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 		goto error_release_channels;
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@@ -95,7 +92,7 @@
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 	return cb_buff;
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 error_free_scan_mask:
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-	kfree(cb_buff->buffer.scan_mask);
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+	bitmap_free(cb_buff->buffer.scan_mask);
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 error_release_channels:
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 	iio_channel_release_all(cb_buff->channels);
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 error_free_cb_buff: