From: Nuno Sa <nuno.sa@xxxxxxxxxx>
Use the new cleanup magic for handling mutexes in IIO. This allows us to
greatly simplify some code paths.
Signed-off-by: Nuno Sa <nuno.sa@xxxxxxxxxx>
---
drivers/iio/industrialio-buffer.c | 105 ++++++++++++++------------------------
1 file changed, 38 insertions(+), 67 deletions(-)
diff --git a/drivers/iio/industrialio-buffer.c b/drivers/iio/industrialio-buffer.c
index b581a7e80566..ec6bc881cf13 100644
--- a/drivers/iio/industrialio-buffer.c
+++ b/drivers/iio/industrialio-buffer.c
@@ -10,6 +10,7 @@
* - Alternative access techniques?
*/
#include <linux/anon_inodes.h>
+#include <linux/cleanup.h>
#include <linux/kernel.h>
#include <linux/export.h>
#include <linux/device.h>
@@ -533,28 +534,25 @@ static ssize_t iio_scan_el_store(struct device *dev,
ret = kstrtobool(buf, &state);
if (ret < 0)
return ret;
- mutex_lock(&iio_dev_opaque->mlock);
- if (iio_buffer_is_active(buffer)) {
- ret = -EBUSY;
- goto error_ret;
- }
+
+ guard(mutex)(&iio_dev_opaque->mlock);
+ if (iio_buffer_is_active(buffer))
+ return -EBUSY;
+
ret = iio_scan_mask_query(indio_dev, buffer, this_attr->address);
if (ret < 0)
- goto error_ret;
+ return ret;
if (!state && ret) {
ret = iio_scan_mask_clear(buffer, this_attr->address);
if (ret)
- goto error_ret;
+ return ret;
} else if (state && !ret) {
ret = iio_scan_mask_set(indio_dev, buffer, this_attr->address);
if (ret)
- goto error_ret;
+ return ret;
}
-error_ret:
- mutex_unlock(&iio_dev_opaque->mlock);
-
- return ret < 0 ? ret : len;
+ return len;
}
static ssize_t iio_scan_el_ts_show(struct device *dev,
@@ -581,16 +579,13 @@ static ssize_t iio_scan_el_ts_store(struct device *dev,
if (ret < 0)
return ret;
- mutex_lock(&iio_dev_opaque->mlock);
- if (iio_buffer_is_active(buffer)) {
- ret = -EBUSY;
- goto error_ret;
- }
- buffer->scan_timestamp = state;
-error_ret:
- mutex_unlock(&iio_dev_opaque->mlock);
+ guard(mutex)(&iio_dev_opaque->mlock);
+ if (iio_buffer_is_active(buffer))
+ return -EBUSY;
- return ret ? ret : len;
+ buffer->scan_timestamp = state;
+
+ return len;
}
static int iio_buffer_add_channel_sysfs(struct iio_dev *indio_dev,
@@ -674,21 +669,16 @@ static ssize_t length_store(struct device *dev, struct device_attribute *attr,
if (val == buffer->length)
return len;
- mutex_lock(&iio_dev_opaque->mlock);
- if (iio_buffer_is_active(buffer)) {
- ret = -EBUSY;
- } else {
- buffer->access->set_length(buffer, val);
- ret = 0;
- }
- if (ret)
- goto out;
+ guard(mutex)(&iio_dev_opaque->mlock);
+ if (iio_buffer_is_active(buffer))
+ return -EBUSY;
+
+ buffer->access->set_length(buffer, val);
+
if (buffer->length && buffer->length < buffer->watermark)
buffer->watermark = buffer->length;
-out:
- mutex_unlock(&iio_dev_opaque->mlock);
- return ret ? ret : len;
+ return len;
}
static ssize_t enable_show(struct device *dev, struct device_attribute *attr,
@@ -1268,7 +1258,6 @@ int iio_update_buffers(struct iio_dev *indio_dev,
struct iio_buffer *remove_buffer)
{
struct iio_dev_opaque *iio_dev_opaque = to_iio_dev_opaque(indio_dev);
- int ret;
if (insert_buffer == remove_buffer)
return 0;
@@ -1277,8 +1266,8 @@ int iio_update_buffers(struct iio_dev *indio_dev,
insert_buffer->direction == IIO_BUFFER_DIRECTION_OUT)
return -EINVAL;
- mutex_lock(&iio_dev_opaque->info_exist_lock);
- mutex_lock(&iio_dev_opaque->mlock);
+ guard(mutex)(&iio_dev_opaque->info_exist_lock);
+ guard(mutex)(&iio_dev_opaque->mlock);
if (insert_buffer && iio_buffer_is_active(insert_buffer))
insert_buffer = NULL;
@@ -1286,23 +1275,13 @@ int iio_update_buffers(struct iio_dev *indio_dev,
if (remove_buffer && !iio_buffer_is_active(remove_buffer))
remove_buffer = NULL;
- if (!insert_buffer && !remove_buffer) {
- ret = 0;
- goto out_unlock;
- }
+ if (!insert_buffer && !remove_buffer)
+ return 0;
- if (!indio_dev->info) {
- ret = -ENODEV;
- goto out_unlock;
- }
+ if (!indio_dev->info)
+ return -ENODEV;
- ret = __iio_update_buffers(indio_dev, insert_buffer, remove_buffer);
-
-out_unlock:
- mutex_unlock(&iio_dev_opaque->mlock);
- mutex_unlock(&iio_dev_opaque->info_exist_lock);
-
- return ret;
+ return __iio_update_buffers(indio_dev, insert_buffer, remove_buffer);
}
EXPORT_SYMBOL_GPL(iio_update_buffers);
@@ -1326,21 +1305,19 @@ static ssize_t enable_store(struct device *dev, struct device_attribute *attr,
if (ret < 0)
return ret;
- mutex_lock(&iio_dev_opaque->mlock);
+ guard(mutex)(&iio_dev_opaque->mlock);
/* Find out if it is in the list */
inlist = iio_buffer_is_active(buffer);
/* Already in desired state */
if (inlist == requested_state)
- goto done;
+ return len;
if (requested_state)
ret = __iio_update_buffers(indio_dev, buffer, NULL);
else
ret = __iio_update_buffers(indio_dev, NULL, buffer);
-done:
- mutex_unlock(&iio_dev_opaque->mlock);
return (ret < 0) ? ret : len;
}
@@ -1368,23 +1345,17 @@ static ssize_t watermark_store(struct device *dev,
if (!val)
return -EINVAL;
- mutex_lock(&iio_dev_opaque->mlock);
+ guard(mutex)(&iio_dev_opaque->mlock);
- if (val > buffer->length) {
- ret = -EINVAL;
- goto out;
- }
+ if (val > buffer->length)
+ return -EINVAL;
- if (iio_buffer_is_active(buffer)) {
- ret = -EBUSY;
- goto out;
- }
+ if (iio_buffer_is_active(buffer))
+ return -EBUSY;
buffer->watermark = val;
-out:
- mutex_unlock(&iio_dev_opaque->mlock);
- return ret ? ret : len;
+ return len;
}
static ssize_t data_available_show(struct device *dev,
--
2.43.0
