From 39ec2997c374b528cdbf65099b6d6b8593a67f7f Mon Sep 17 00:00:00 2001 From: Vasanthakumar Thiagarajan Date: Wed, 10 Nov 2010 05:03:15 -0800 Subject: [PATCH] ath9k: Fix bug in delimiter padding computation There is a roundng error in delimiter padding computation which causes severe throughput drop with some of AR9003. signed-off-by: Felix Fietkau Signed-off-by: Vasanthakumar Thiagarajan Cc:stable@kernel.org Signed-off-by: John W. Linville --- drivers/net/wireless/ath/ath9k/ath9k.h | 4 ++-- 1 file changed, 2 insertions(+), 2 deletions(-) diff --git a/drivers/net/wireless/ath/ath9k/ath9k.h b/drivers/net/wireless/ath/ath9k/ath9k.h index 21433465bde4..92670ce4ea99 100644 --- a/drivers/net/wireless/ath/ath9k/ath9k.h +++ b/drivers/net/wireless/ath/ath9k/ath9k.h @@ -177,8 +177,8 @@ void ath_descdma_cleanup(struct ath_softc *sc, struct ath_descdma *dd, /* returns delimiter padding required given the packet length */ #define ATH_AGGR_GET_NDELIM(_len) \ - (((((_len) + ATH_AGGR_DELIM_SZ) < ATH_AGGR_MINPLEN) ? \ - (ATH_AGGR_MINPLEN - (_len) - ATH_AGGR_DELIM_SZ) : 0) >> 2) + (((_len) >= ATH_AGGR_MINPLEN) ? 0 : \ + DIV_ROUND_UP(ATH_AGGR_MINPLEN - (_len), ATH_AGGR_DELIM_SZ)) #define BAW_WITHIN(_start, _bawsz, _seqno) \ ((((_seqno) - (_start)) & 4095) < (_bawsz)) -- 2.20.1