From: Gilad Ben-Yossef <gilad@benyossef.com>
Date: Mon, 13 Nov 2017 14:45:38 +0000 (+0000)
Subject: staging: ccree: document spinlock usage
X-Git-Url: http://git.maquefel.me/?a=commitdiff_plain;h=da4e52ac3e0af04ab75ed979f44db35557028f50;p=linux.git

staging: ccree: document spinlock usage

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>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
---

diff --git a/drivers/staging/ccree/ssi_request_mgr.c b/drivers/staging/ccree/ssi_request_mgr.c
index 65c4d9f3f262f..1d9c0381059b7 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;