From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: from mail.kernel.org ([198.145.29.99]:38080 "EHLO mail.kernel.org" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1031192AbeE1KR4 (ORCPT ); Mon, 28 May 2018 06:17:56 -0400 From: Greg Kroah-Hartman To: linux-kernel@vger.kernel.org Cc: Greg Kroah-Hartman , stable@vger.kernel.org, Felix Fietkau , Johannes Berg , Sasha Levin Subject: [PATCH 4.4 089/268] mac80211: round IEEE80211_TX_STATUS_HEADROOM up to multiple of 4 Date: Mon, 28 May 2018 12:01:03 +0200 Message-Id: <20180528100212.269092817@linuxfoundation.org> In-Reply-To: <20180528100202.045206534@linuxfoundation.org> References: <20180528100202.045206534@linuxfoundation.org> MIME-Version: 1.0 Content-Type: text/plain; charset=UTF-8 Sender: stable-owner@vger.kernel.org List-ID: 4.4-stable review patch. If anyone has any objections, please let me know. ------------------ From: Felix Fietkau [ Upstream commit 651b9920d7a694ffb1f885aef2bbb068a25d9d66 ] This ensures that mac80211 allocated management frames are properly aligned, which makes copying them more efficient. For instance, mt76 uses iowrite32_copy to copy beacon frames to beacon template memory on the chip. Misaligned 32-bit accesses cause CPU exceptions on MIPS and should be avoided. Signed-off-by: Felix Fietkau Signed-off-by: Johannes Berg Signed-off-by: Sasha Levin Signed-off-by: Greg Kroah-Hartman --- include/net/mac80211.h | 2 +- 1 file changed, 1 insertion(+), 1 deletion(-) --- a/include/net/mac80211.h +++ b/include/net/mac80211.h @@ -3898,7 +3898,7 @@ static inline int ieee80211_sta_ps_trans * The TX headroom reserved by mac80211 for its own tx_status functions. * This is enough for the radiotap header. */ -#define IEEE80211_TX_STATUS_HEADROOM 14 +#define IEEE80211_TX_STATUS_HEADROOM ALIGN(14, 4) /** * ieee80211_sta_set_buffered - inform mac80211 about driver-buffered frames