From: Mark Rutland Date: Wed, 11 Jan 2017 14:32:14 +0000 (+0200) Subject: ath9k: ar9002_mac: kill off ACCESS_ONCE() X-Git-Tag: v4.11-rc1~124^2~264^2^2~27 X-Git-Url: https://asedeno.scripts.mit.edu/gitweb/?a=commitdiff_plain;h=d5a3a76a9cb814b377d12fe4ebe5cff20b63f390;p=linux.git ath9k: ar9002_mac: kill off ACCESS_ONCE() 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 Signed-off-by: Kalle Valo --- diff --git a/drivers/net/wireless/ath/ath9k/ar9002_mac.c b/drivers/net/wireless/ath/ath9k/ar9002_mac.c index f816909d9474..4b3c9b108197 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; }