From 2691f27159e99e2b3aef1f876df69073a50be6d6 Mon Sep 17 00:00:00 2001
From: Vladimir Kondratiev <qca_vkondrat@qca.qualcomm.com>
Date: Tue, 27 May 2014 14:45:50 +0300
Subject: [PATCH] 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>
Git-commit: cf42c4e5d3019d801ec6d033b63de5446a53af5c
Git-repo: git://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git
Signed-off-by: Liron Kuch <lkuch@codeaurora.org>
---
drivers/net/wireless/ath/wil6210/rx_reorder.c | 9 ++++++++-
1 file changed, 8 insertions(+), 1 deletion(-)
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,
--
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