From patchwork Tue Dec 27 18:49:58 2016 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Mark Rutland X-Patchwork-Id: 9489799 X-Patchwork-Delegate: kvalo@adurom.com Return-Path: Received: from mail.wl.linuxfoundation.org (pdx-wl-mail.web.codeaurora.org [172.30.200.125]) by pdx-korg-patchwork.web.codeaurora.org (Postfix) with ESMTP id 87A9862AAF for ; Tue, 27 Dec 2016 18:53:03 +0000 (UTC) Received: from mail.wl.linuxfoundation.org (localhost [127.0.0.1]) by mail.wl.linuxfoundation.org (Postfix) with ESMTP id 74FB11FF8F for ; Tue, 27 Dec 2016 18:53:03 +0000 (UTC) Received: by mail.wl.linuxfoundation.org (Postfix, from userid 486) id 6984F2094F; Tue, 27 Dec 2016 18:53:03 +0000 (UTC) X-Spam-Checker-Version: SpamAssassin 3.3.1 (2010-03-16) on pdx-wl-mail.web.codeaurora.org X-Spam-Level: X-Spam-Status: No, score=-6.9 required=2.0 tests=BAYES_00,RCVD_IN_DNSWL_HI autolearn=ham version=3.3.1 Received: from vger.kernel.org (vger.kernel.org [209.132.180.67]) by mail.wl.linuxfoundation.org (Postfix) with ESMTP id 98E302094D for ; Tue, 27 Dec 2016 18:53:02 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1755522AbcL0Sw4 (ORCPT ); Tue, 27 Dec 2016 13:52:56 -0500 Received: from foss.arm.com ([217.140.101.70]:54198 "EHLO foss.arm.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1755165AbcL0Sww (ORCPT ); Tue, 27 Dec 2016 13:52:52 -0500 Received: from usa-sjc-imap-foss1.foss.arm.com (unknown [10.72.51.249]) by usa-sjc-mx-foss1.foss.arm.com (Postfix) with ESMTP id D0EDE1500; Tue, 27 Dec 2016 10:50:12 -0800 (PST) Received: from remoulade.thecloud.net (usa-sjc-mx-foss1.foss.arm.com [217.140.101.70]) by usa-sjc-imap-foss1.foss.arm.com (Postfix) with ESMTPA id 196E13F242; Tue, 27 Dec 2016 10:50:10 -0800 (PST) From: Mark Rutland To: linux-kernel@vger.kernel.org Cc: ath9k-devel@qca.qualcomm.com, kvalo@codeaurora.org, linux-wireless@vger.kernel.org, ath9k-devel@lists.ath9k.org, netdev@vger.kernel.org, Mark Rutland Subject: [PATCH 1/2] ath9k: ar9002_mac: kill off ACCESS_ONCE() Date: Tue, 27 Dec 2016 18:49:58 +0000 Message-Id: <1482864599-19995-2-git-send-email-mark.rutland@arm.com> X-Mailer: git-send-email 2.7.4 In-Reply-To: <1482864599-19995-1-git-send-email-mark.rutland@arm.com> References: <1482864599-19995-1-git-send-email-mark.rutland@arm.com> Sender: linux-wireless-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: linux-wireless@vger.kernel.org X-Virus-Scanned: ClamAV using ClamSMTP For several reasons, it is desirable to use {READ,WRITE}_ONCE() in preference to ACCESS_ONCE(), and new code is expected to use one of the former. So far, there's been no reason to change most existing uses of ACCESS_ONCE(), as these aren't currently harmful. However, for some new features (e.g. KTSAN / Kernel Thread Sanitizer), it is necessary to instrument reads and writes separately, which is not possible with ACCESS_ONCE(). This distinction is critical to correct operation. It's possible to transform the bulk of kernel code using the Coccinelle script below. However, for some files (including the ath9k ar9002 mac driver), this mangles the formatting. As a preparatory step, this patch converts the driver to use {READ,WRITE}_ONCE() without said mangling. ---- virtual patch @ depends on patch @ expression E1, E2; @@ - ACCESS_ONCE(E1) = E2 + WRITE_ONCE(E1, E2) @ depends on patch @ expression E; @@ - ACCESS_ONCE(E) + READ_ONCE(E) ---- Signed-off-by: Mark Rutland Cc: ath9k-devel@qca.qualcomm.com Cc: Kalle Valo Cc: linux-wireless@vger.kernel.org Cc: ath9k-devel@lists.ath9k.org Cc: netdev@vger.kernel.org --- drivers/net/wireless/ath/ath9k/ar9002_mac.c | 64 ++++++++++++++--------------- 1 file changed, 32 insertions(+), 32 deletions(-) diff --git a/drivers/net/wireless/ath/ath9k/ar9002_mac.c b/drivers/net/wireless/ath/ath9k/ar9002_mac.c index f816909..4b3c9b1 100644 --- a/drivers/net/wireless/ath/ath9k/ar9002_mac.c +++ b/drivers/net/wireless/ath/ath9k/ar9002_mac.c @@ -220,8 +220,8 @@ ar9002_set_txdesc(struct ath_hw *ah, void *ds, struct ath_tx_info *i) ads->ds_txstatus6 = ads->ds_txstatus7 = 0; ads->ds_txstatus8 = ads->ds_txstatus9 = 0; - ACCESS_ONCE(ads->ds_link) = i->link; - ACCESS_ONCE(ads->ds_data) = i->buf_addr[0]; + WRITE_ONCE(ads->ds_link, i->link); + WRITE_ONCE(ads->ds_data, i->buf_addr[0]); ctl1 = i->buf_len[0] | (i->is_last ? 0 : AR_TxMore); ctl6 = SM(i->keytype, AR_EncrType); @@ -235,26 +235,26 @@ ar9002_set_txdesc(struct ath_hw *ah, void *ds, struct ath_tx_info *i) if ((i->is_first || i->is_last) && i->aggr != AGGR_BUF_MIDDLE && i->aggr != AGGR_BUF_LAST) { - ACCESS_ONCE(ads->ds_ctl2) = set11nTries(i->rates, 0) + WRITE_ONCE(ads->ds_ctl2, set11nTries(i->rates, 0) | set11nTries(i->rates, 1) | set11nTries(i->rates, 2) | set11nTries(i->rates, 3) | (i->dur_update ? AR_DurUpdateEna : 0) - | SM(0, AR_BurstDur); + | SM(0, AR_BurstDur)); - ACCESS_ONCE(ads->ds_ctl3) = set11nRate(i->rates, 0) + WRITE_ONCE(ads->ds_ctl3, set11nRate(i->rates, 0) | set11nRate(i->rates, 1) | set11nRate(i->rates, 2) - | set11nRate(i->rates, 3); + | set11nRate(i->rates, 3)); } else { - ACCESS_ONCE(ads->ds_ctl2) = 0; - ACCESS_ONCE(ads->ds_ctl3) = 0; + WRITE_ONCE(ads->ds_ctl2, 0); + WRITE_ONCE(ads->ds_ctl3, 0); } if (!i->is_first) { - ACCESS_ONCE(ads->ds_ctl0) = 0; - ACCESS_ONCE(ads->ds_ctl1) = ctl1; - ACCESS_ONCE(ads->ds_ctl6) = ctl6; + WRITE_ONCE(ads->ds_ctl0, 0); + WRITE_ONCE(ads->ds_ctl1, ctl1); + WRITE_ONCE(ads->ds_ctl6, ctl6); return; } @@ -279,7 +279,7 @@ ar9002_set_txdesc(struct ath_hw *ah, void *ds, struct ath_tx_info *i) break; } - ACCESS_ONCE(ads->ds_ctl0) = (i->pkt_len & AR_FrameLen) + WRITE_ONCE(ads->ds_ctl0, (i->pkt_len & AR_FrameLen) | (i->flags & ATH9K_TXDESC_VMF ? AR_VirtMoreFrag : 0) | SM(i->txpower[0], AR_XmitPower0) | (i->flags & ATH9K_TXDESC_VEOL ? AR_VEOL : 0) @@ -287,29 +287,29 @@ ar9002_set_txdesc(struct ath_hw *ah, void *ds, struct ath_tx_info *i) | (i->keyix != ATH9K_TXKEYIX_INVALID ? AR_DestIdxValid : 0) | (i->flags & ATH9K_TXDESC_CLRDMASK ? AR_ClrDestMask : 0) | (i->flags & ATH9K_TXDESC_RTSENA ? AR_RTSEnable : - (i->flags & ATH9K_TXDESC_CTSENA ? AR_CTSEnable : 0)); + (i->flags & ATH9K_TXDESC_CTSENA ? AR_CTSEnable : 0))); - ACCESS_ONCE(ads->ds_ctl1) = ctl1; - ACCESS_ONCE(ads->ds_ctl6) = ctl6; + WRITE_ONCE(ads->ds_ctl1, ctl1); + WRITE_ONCE(ads->ds_ctl6, ctl6); if (i->aggr == AGGR_BUF_MIDDLE || i->aggr == AGGR_BUF_LAST) return; - ACCESS_ONCE(ads->ds_ctl4) = set11nPktDurRTSCTS(i->rates, 0) - | set11nPktDurRTSCTS(i->rates, 1); + WRITE_ONCE(ads->ds_ctl4, set11nPktDurRTSCTS(i->rates, 0) + | set11nPktDurRTSCTS(i->rates, 1)); - ACCESS_ONCE(ads->ds_ctl5) = set11nPktDurRTSCTS(i->rates, 2) - | set11nPktDurRTSCTS(i->rates, 3); + WRITE_ONCE(ads->ds_ctl5, set11nPktDurRTSCTS(i->rates, 2) + | set11nPktDurRTSCTS(i->rates, 3)); - ACCESS_ONCE(ads->ds_ctl7) = set11nRateFlags(i->rates, 0) + WRITE_ONCE(ads->ds_ctl7, set11nRateFlags(i->rates, 0) | set11nRateFlags(i->rates, 1) | set11nRateFlags(i->rates, 2) | set11nRateFlags(i->rates, 3) - | SM(i->rtscts_rate, AR_RTSCTSRate); + | SM(i->rtscts_rate, AR_RTSCTSRate)); - ACCESS_ONCE(ads->ds_ctl9) = SM(i->txpower[1], AR_XmitPower1); - ACCESS_ONCE(ads->ds_ctl10) = SM(i->txpower[2], AR_XmitPower2); - ACCESS_ONCE(ads->ds_ctl11) = SM(i->txpower[3], AR_XmitPower3); + WRITE_ONCE(ads->ds_ctl9, SM(i->txpower[1], AR_XmitPower1)); + WRITE_ONCE(ads->ds_ctl10, SM(i->txpower[2], AR_XmitPower2)); + WRITE_ONCE(ads->ds_ctl11, SM(i->txpower[3], AR_XmitPower3)); } static int ar9002_hw_proc_txdesc(struct ath_hw *ah, void *ds, @@ -318,7 +318,7 @@ static int ar9002_hw_proc_txdesc(struct ath_hw *ah, void *ds, struct ar5416_desc *ads = AR5416DESC(ds); u32 status; - status = ACCESS_ONCE(ads->ds_txstatus9); + status = READ_ONCE(ads->ds_txstatus9); if ((status & AR_TxDone) == 0) return -EINPROGRESS; @@ -332,7 +332,7 @@ static int ar9002_hw_proc_txdesc(struct ath_hw *ah, void *ds, ts->ts_rateindex = MS(status, AR_FinalTxIdx); ts->ts_seqnum = MS(status, AR_SeqNum); - status = ACCESS_ONCE(ads->ds_txstatus0); + status = READ_ONCE(ads->ds_txstatus0); ts->ts_rssi_ctl0 = MS(status, AR_TxRSSIAnt00); ts->ts_rssi_ctl1 = MS(status, AR_TxRSSIAnt01); ts->ts_rssi_ctl2 = MS(status, AR_TxRSSIAnt02); @@ -342,7 +342,7 @@ static int ar9002_hw_proc_txdesc(struct ath_hw *ah, void *ds, ts->ba_high = ads->AR_BaBitmapHigh; } - status = ACCESS_ONCE(ads->ds_txstatus1); + status = READ_ONCE(ads->ds_txstatus1); if (status & AR_FrmXmitOK) ts->ts_status |= ATH9K_TX_ACKED; else { @@ -371,7 +371,7 @@ static int ar9002_hw_proc_txdesc(struct ath_hw *ah, void *ds, ts->ts_longretry = MS(status, AR_DataFailCnt); ts->ts_virtcol = MS(status, AR_VirtRetryCnt); - status = ACCESS_ONCE(ads->ds_txstatus5); + status = READ_ONCE(ads->ds_txstatus5); ts->ts_rssi = MS(status, AR_TxRSSICombined); ts->ts_rssi_ext0 = MS(status, AR_TxRSSIAnt10); ts->ts_rssi_ext1 = MS(status, AR_TxRSSIAnt11); @@ -390,13 +390,13 @@ static int ar9002_hw_get_duration(struct ath_hw *ah, const void *ds, int index) switch (index) { case 0: - return MS(ACCESS_ONCE(ads->ds_ctl4), AR_PacketDur0); + return MS(READ_ONCE(ads->ds_ctl4), AR_PacketDur0); case 1: - return MS(ACCESS_ONCE(ads->ds_ctl4), AR_PacketDur1); + return MS(READ_ONCE(ads->ds_ctl4), AR_PacketDur1); case 2: - return MS(ACCESS_ONCE(ads->ds_ctl5), AR_PacketDur2); + return MS(READ_ONCE(ads->ds_ctl5), AR_PacketDur2); case 3: - return MS(ACCESS_ONCE(ads->ds_ctl5), AR_PacketDur3); + return MS(READ_ONCE(ads->ds_ctl5), AR_PacketDur3); default: return -1; }