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| author | Gilad Ben-Yossef | 2017-11-13 15:45:38 +0100 |
|---|---|---|
| committer | Greg Kroah-Hartman | 2017-11-27 09:20:39 +0100 |
| commit | da4e52ac3e0af04ab75ed979f44db35557028f50 (patch) | |
| tree | cff29522efb5b46d75097b77217db0c6fb515207 /drivers/staging | |
| parent | staging: ccree: replace open coded loop with for (diff) | |
| download | kernel-qcow2-linux-da4e52ac3e0af04ab75ed979f44db35557028f50.tar.gz kernel-qcow2-linux-da4e52ac3e0af04ab75ed979f44db35557028f50.tar.xz kernel-qcow2-linux-da4e52ac3e0af04ab75ed979f44db35557028f50.zip | |
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>
Diffstat (limited to 'drivers/staging')
| -rw-r--r-- | drivers/staging/ccree/ssi_request_mgr.c | 3 |
1 files changed, 3 insertions, 0 deletions
diff --git a/drivers/staging/ccree/ssi_request_mgr.c b/drivers/staging/ccree/ssi_request_mgr.c index 65c4d9f3f262..1d9c0381059b 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; |