linux-kernel - [PATCH v2 2/2] iio: buffer: Use dedicated variable in iio_buffers_alloc_sysfs_and

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Date:   Wed, 13 Oct 2021 12:49:23 +0300
From:   Andy Shevchenko <andriy.shevchenko@...ux.intel.com>
To:     Jonathan Cameron <Jonathan.Cameron@...wei.com>,
        Alexandru Ardelean <aardelean@...iqon.com>,
        linux-iio@...r.kernel.org, linux-kernel@...r.kernel.org
Cc:     Jonathan Cameron <jic23@...nel.org>,
        Lars-Peter Clausen <lars@...afoo.de>,
        Yang Yingliang <yangyingliang@...wei.com>,
        Andy Shevchenko <andriy.shevchenko@...ux.intel.com>
Subject: [PATCH v2 2/2] iio: buffer: Use dedicated variable in iio_buffers_alloc_sysfs_and_mask()

Use dedicated variable for index in the loop in the
iio_buffers_alloc_sysfs_and_mask(). This will make code cleaner and
less error prone as proved by previous changes done in this function.

Signed-off-by: Andy Shevchenko <andriy.shevchenko@...ux.intel.com>
---
 drivers/iio/industrialio-buffer.c | 18 +++++++-----------
 1 file changed, 7 insertions(+), 11 deletions(-)

diff --git a/drivers/iio/industrialio-buffer.c b/drivers/iio/industrialio-buffer.c
index bb181d11573c..d53f8e6d5935 100644
--- a/drivers/iio/industrialio-buffer.c
+++ b/drivers/iio/industrialio-buffer.c
@@ -1596,8 +1596,7 @@ int iio_buffers_alloc_sysfs_and_mask(struct iio_dev *indio_dev)
 	struct iio_dev_opaque *iio_dev_opaque = to_iio_dev_opaque(indio_dev);
 	const struct iio_chan_spec *channels;
 	struct iio_buffer *buffer;
-	int unwind_idx;
-	int ret, i;
+	int ret, i, idx;
 	size_t sz;
 
 	channels = indio_dev->channels;
@@ -1612,15 +1611,12 @@ int iio_buffers_alloc_sysfs_and_mask(struct iio_dev *indio_dev)
 	if (!iio_dev_opaque->attached_buffers_cnt)
 		return 0;
 
-	for (i = 0; i < iio_dev_opaque->attached_buffers_cnt; i++) {
-		buffer = iio_dev_opaque->attached_buffers[i];
-		ret = __iio_buffer_alloc_sysfs_and_mask(buffer, indio_dev, i);
-		if (ret) {
-			unwind_idx = i - 1;
+	for (idx = 0; idx < iio_dev_opaque->attached_buffers_cnt; idx++) {
+		buffer = iio_dev_opaque->attached_buffers[idx];
+		ret = __iio_buffer_alloc_sysfs_and_mask(buffer, indio_dev, idx);
+		if (ret)
 			goto error_unwind_sysfs_and_mask;
-		}
 	}
-	unwind_idx = iio_dev_opaque->attached_buffers_cnt - 1;
 
 	sz = sizeof(*(iio_dev_opaque->buffer_ioctl_handler));
 	iio_dev_opaque->buffer_ioctl_handler = kzalloc(sz, GFP_KERNEL);
@@ -1636,8 +1632,8 @@ int iio_buffers_alloc_sysfs_and_mask(struct iio_dev *indio_dev)
 	return 0;
 
 error_unwind_sysfs_and_mask:
-	for (; unwind_idx >= 0; unwind_idx--) {
-		buffer = iio_dev_opaque->attached_buffers[unwind_idx];
+	while (idx--) {
+		buffer = iio_dev_opaque->attached_buffers[idx];
 		__iio_buffer_free_sysfs_and_mask(buffer);
 	}
 	return ret;
-- 
2.33.0