| Date | Tue, 15 Feb 2011 16:20:23 -0800 | From | Greg KH <> | Subject | [patch 055/176] ath9k: Fix bug in delimiter padding computation |
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2.6.36-stable review patch. If anyone has any objections, please let us know.
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From: Vasanthakumar Thiagarajan <vasanth@atheros.com>
commit 39ec2997c374b528cdbf65099b6d6b8593a67f7f upstream.
There is a roundng error in delimiter padding computation which causes severe throughput drop with some of AR9003.
signed-off-by: Felix Fietkau <nbd@openwrt.org> Signed-off-by: Vasanthakumar Thiagarajan <vasanth@atheros.com> Signed-off-by: John W. Linville <linville@tuxdriver.com> Signed-off-by: Greg Kroah-Hartman <gregkh@suse.de>
--- drivers/net/wireless/ath/ath9k/ath9k.h | 4 ++-- 1 file changed, 2 insertions(+), 2 deletions(-)
--- 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_soft /* 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))
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