wil6210: optimize wil_release_reorder_frames

In case of receiving frame with sequence number far greater than current,
wil_release_reorder_frames() will iterate many times over empty buffer.

Optimize this case by checking buffer emptiness and simply update
head_seq_num without iterating.

Suggested-by: Vladimir Shulman <Vladimir.Shulman@Wilocity.com>
Signed-off-by: Vladimir Kondratiev <qca_vkondrat@qca.qualcomm.com>
Signed-off-by: John W. Linville <linville@tuxdriver.com>

1 files changed, 8 insertions, 1 deletions

diff --git a/drivers/net/wireless/ath/wil6210/rx_reorder.c b/drivers/net/wireless/ath/wil6210/rx_reorder.c
index ec29954bd44d..747ae1275877 100644
--- a/drivers/net/wireless/ath/wil6210/rx_reorder.c
+++ b/drivers/net/wireless/ath/wil6210/rx_reorder.c
@@ -49,10 +49,17 @@ static void wil_release_reorder_frames(struct wil6210_priv *wil,
 {
         int index;
 
-        while (seq_less(r->head_seq_num, hseq)) {
+        /* note: this function is never called with
+         * hseq preceding r->head_seq_num, i.e it is always true
+         * !seq_less(hseq, r->head_seq_num)
+         * and thus on loop exit it should be
+         * r->head_seq_num == hseq
+         */
+        while (seq_less(r->head_seq_num, hseq) && r->stored_mpdu_num) {
                 index = reorder_index(r, r->head_seq_num);
                 wil_release_reorder_frame(wil, r, index);
         }
+        r->head_seq_num = hseq;
 }
 
 static void wil_reorder_release(struct wil6210_priv *wil,