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staging: ccree: document spinlock usage

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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>
This commit is contained in:
Gilad Ben-Yossef
2017-11-13 14:45:38 +00:00
committed by Greg Kroah-Hartman
parent add496c0ba
commit da4e52ac3e
1 changed files with 3 additions and 0 deletions
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3
drivers/staging/ccree/ssi_request_mgr.c
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@@ -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;