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Diffstat (limited to 'drivers/hwtracing/intel_th/msu.c')
-rw-r--r--drivers/hwtracing/intel_th/msu.c12
1 files changed, 10 insertions, 2 deletions
diff --git a/drivers/hwtracing/intel_th/msu.c b/drivers/hwtracing/intel_th/msu.c
index 9621efe0e9..be63d5b8f1 100644
--- a/drivers/hwtracing/intel_th/msu.c
+++ b/drivers/hwtracing/intel_th/msu.c
@@ -61,6 +61,7 @@ enum lockout_state {
* @lo_lock: lockout state serialization
* @nr_blocks: number of blocks (pages) in this window
* @nr_segs: number of segments in this window (<= @nr_blocks)
+ * @msc: pointer to the MSC device
* @_sgt: array of block descriptors
* @sgt: array of block descriptors
*/
@@ -119,7 +120,6 @@ struct msc_iter {
* @user_count: number of users of the buffer
* @mmap_count: number of mappings
* @buf_mutex: mutex to serialize access to buffer-related bits
-
* @enabled: MSC is enabled
* @wrap: wrapping is enabled
* @mode: MSC operating mode
@@ -755,6 +755,8 @@ unlock:
* Program storage mode, wrapping, burst length and trace buffer address
* into a given MSC. Then, enable tracing and set msc::enabled.
* The latter is serialized on msc::buf_mutex, so make sure to hold it.
+ *
+ * Return: %0 for success or a negative error code otherwise.
*/
static int msc_configure(struct msc *msc)
{
@@ -1291,7 +1293,8 @@ static void msc_buffer_free(struct msc *msc)
/**
* msc_buffer_alloc() - allocate a buffer for MSC
* @msc: MSC device
- * @size: allocation size in bytes
+ * @nr_pages: number of pages for each window
+ * @nr_wins: number of windows
*
* Allocate a storage buffer for MSC, depending on the msc::mode, it will be
* either done via msc_buffer_contig_alloc() for SINGLE operation mode or
@@ -1370,6 +1373,9 @@ static int msc_buffer_unlocked_free_unless_used(struct msc *msc)
* @msc: MSC device
*
* This is a locked version of msc_buffer_unlocked_free_unless_used().
+ *
+ * Return: 0 on successful deallocation or if there was no buffer to
+ * deallocate, -EBUSY if there are active users.
*/
static int msc_buffer_free_unless_used(struct msc *msc)
{
@@ -1438,6 +1444,8 @@ struct msc_win_to_user_struct {
* @data: callback's private data
* @src: source buffer
* @len: amount of data to copy from the source buffer
+ *
+ * Return: >= %0 for success or -errno for error.
*/
static unsigned long msc_win_to_user(void *data, void *src, size_t len)
{