[PATCH 10/24] staging: ccree: document spinlock usage

[Gilad Ben-Yossef]

Document spinlock usage to protect against concurrent
access to HW register which must occur a single
request at a time.

Signed-off-by: Gilad Ben-Yossef <gi...@benyossef.com>
---
 drivers/staging/ccree/ssi_request_mgr.c | 3 +++
 1 file changed, 3 insertions(+)

diff --git a/drivers/staging/ccree/ssi_request_mgr.c 
b/drivers/staging/ccree/ssi_request_mgr.c
index 65c4d9f..1d9c038 100644
--- a/drivers/staging/ccree/ssi_request_mgr.c
+++ b/drivers/staging/ccree/ssi_request_mgr.c
@@ -43,6 +43,9 @@ struct ssi_request_mgr_handle {
        u32 req_queue_tail;
        u32 axi_completed;
        u32 q_free_slots;
+       /* This lock protects access to HW register
+        * that must be single request at a time
+        */
        spinlock_t hw_lock;
        struct cc_hw_desc compl_desc;
        u8 *dummy_comp_buff;
-- 
2.7.4