From 248be5aafc7cfe860b8f310bfc3f433e51f9fb11 Mon Sep 17 00:00:00 2001 From: Lars-Peter Clausen Date: Wed, 13 May 2015 16:04:45 +0200 Subject: [PATCH] iio: __iio_update_buffers: Slightly refactor scan mask memory management Add a small helper function iio_free_scan_mask() that takes a mask and frees its memory if the scan masks for the device are dynamically allocated, otherwise does nothing. This means we don't have to open-code the same check over and over again in __iio_update_buffers. Also free compound_mask as soon a we are done using it. This constrains its usage to a specific region of the function will make further refactoring and splitting the function into smaller sub-parts more easier. Signed-off-by: Lars-Peter Clausen Signed-off-by: Jonathan Cameron --- drivers/iio/industrialio-buffer.c | 23 +++++++++++++---------- 1 file changed, 13 insertions(+), 10 deletions(-) diff --git a/drivers/iio/industrialio-buffer.c b/drivers/iio/industrialio-buffer.c index 1f91031..2afe3db 100644 --- a/drivers/iio/industrialio-buffer.c +++ b/drivers/iio/industrialio-buffer.c @@ -575,6 +575,14 @@ static void iio_buffer_update_bytes_per_datum(struct iio_dev *indio_dev, buffer->access->set_bytes_per_datum(buffer, bytes); } +static void iio_free_scan_mask(struct iio_dev *indio_dev, + const unsigned long *mask) +{ + /* If the mask is dynamically allocated free it, otherwise do nothing */ + if (!indio_dev->available_scan_masks) + kfree(mask); +} + static int __iio_update_buffers(struct iio_dev *indio_dev, struct iio_buffer *insert_buffer, struct iio_buffer *remove_buffer) @@ -612,8 +620,7 @@ static int __iio_update_buffers(struct iio_dev *indio_dev, /* If no buffers in list, we are done */ if (list_empty(&indio_dev->buffer_list)) { indio_dev->currentmode = INDIO_DIRECT_MODE; - if (indio_dev->available_scan_masks == NULL) - kfree(old_mask); + iio_free_scan_mask(indio_dev, old_mask); return 0; } @@ -621,8 +628,7 @@ static int __iio_update_buffers(struct iio_dev *indio_dev, compound_mask = kcalloc(BITS_TO_LONGS(indio_dev->masklength), sizeof(long), GFP_KERNEL); if (compound_mask == NULL) { - if (indio_dev->available_scan_masks == NULL) - kfree(old_mask); + iio_free_scan_mask(indio_dev, old_mask); return -ENOMEM; } indio_dev->scan_timestamp = 0; @@ -637,6 +643,7 @@ static int __iio_update_buffers(struct iio_dev *indio_dev, iio_scan_mask_match(indio_dev->available_scan_masks, indio_dev->masklength, compound_mask); + kfree(compound_mask); if (indio_dev->active_scan_mask == NULL) { /* * Roll back. @@ -648,7 +655,6 @@ static int __iio_update_buffers(struct iio_dev *indio_dev, success = -EINVAL; } else { - kfree(compound_mask); ret = -EINVAL; return ret; } @@ -721,10 +727,7 @@ static int __iio_update_buffers(struct iio_dev *indio_dev, } } - if (indio_dev->available_scan_masks) - kfree(compound_mask); - else - kfree(old_mask); + iio_free_scan_mask(indio_dev, old_mask); return success; @@ -736,8 +739,8 @@ error_run_postdisable: error_remove_inserted: if (insert_buffer) iio_buffer_deactivate(insert_buffer); + iio_free_scan_mask(indio_dev, indio_dev->active_scan_mask); indio_dev->active_scan_mask = old_mask; - kfree(compound_mask); return ret; } -- 2.7.4