diff mbox series

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

Message ID 1510584358-29473-11-git-send-email-gilad@benyossef.com
State Accepted
Commit da4e52ac3e0af04ab75ed979f44db35557028f50
Headers show
Series [01/24] staging: ccree: fix typos | expand

Commit Message

Gilad Ben-Yossef Nov. 13, 2017, 2:45 p.m. UTC 
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 <gilad@benyossef.com>

---
 drivers/staging/ccree/ssi_request_mgr.c | 3 +++
 1 file changed, 3 insertions(+)

-- 
2.7.4
diff mbox series

Patch

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;