mwifiex: CPU mips optimization with NO_PKT_PRIO_TID

If we go through the entire for loop in
mwifiex_wmm_get_highest_priolist_ptr() and don't find any packets,
set highest_queued_prio to NO_PKT_PRIO_TID (< LOW_PRIO_TID).

Signed-off-by: Marc Yang <yangyang@marvell.com>
Signed-off-by: Bing Zhao <bzhao@marvell.com>
Signed-off-by: John W. Linville <linville@tuxdriver.com>

2 files changed, 7 insertions, 0 deletions

diff --git a/drivers/net/wireless/mwifiex/main.h b/drivers/net/wireless/mwifiex/main.h
index ea3184d15674..3154b0a31ea6 100644
--- a/drivers/net/wireless/mwifiex/main.h
+++ b/drivers/net/wireless/mwifiex/main.h
@@ -202,6 +202,7 @@ struct mwifiex_tid_tbl {
 #define WMM_HIGHEST_PRIORITY            7
 #define HIGH_PRIO_TID                           7
 #define LOW_PRIO_TID                            0
+#define NO_PKT_PRIO_TID                         (-1)
 
 struct mwifiex_wmm_desc {
         struct mwifiex_tid_tbl tid_tbl_ptr[MAX_NUM_TID];
diff --git a/drivers/net/wireless/mwifiex/wmm.c b/drivers/net/wireless/mwifiex/wmm.c
index 784ad4c00995..91634daec306 100644
--- a/drivers/net/wireless/mwifiex/wmm.c
+++ b/drivers/net/wireless/mwifiex/wmm.c
@@ -946,6 +946,12 @@ mwifiex_wmm_get_highest_priolist_ptr(struct mwifiex_adapter *adapter,
                                 } while (ptr != head);
                         }
 
+                        /* No packet at any TID for this priv. Mark as such
+                         * to skip checking TIDs for this priv (until pkt is
+                         * added).
+                         */
+                        atomic_set(hqp, NO_PKT_PRIO_TID);
+
                         /* Get next bss priority node */
                         bssprio_node = list_first_entry(&bssprio_node->list,
                                                 struct mwifiex_bss_prio_node,