From 50f3818196f5d6a87867772b40637af1d51e11f3 Mon Sep 17 00:00:00 2001 From: Mark Rutland Date: Wed, 11 Jan 2017 16:32:15 +0200 Subject: [PATCH] ath9k: ar9003_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 ar9003 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 --- drivers/net/wireless/ath/ath9k/ar9003_mac.c | 92 ++++++++++----------- 1 file changed, 46 insertions(+), 46 deletions(-) diff --git a/drivers/net/wireless/ath/ath9k/ar9003_mac.c b/drivers/net/wireless/ath/ath9k/ar9003_mac.c index da84b705cbcd..cc5bb0a76baf 100644 --- a/drivers/net/wireless/ath/ath9k/ar9003_mac.c +++ b/drivers/net/wireless/ath/ath9k/ar9003_mac.c @@ -39,47 +39,47 @@ ar9003_set_txdesc(struct ath_hw *ah, void *ds, struct ath_tx_info *i) (i->qcu << AR_TxQcuNum_S) | desc_len; checksum += val; - ACCESS_ONCE(ads->info) = val; + WRITE_ONCE(ads->info, val); checksum += i->link; - ACCESS_ONCE(ads->link) = i->link; + WRITE_ONCE(ads->link, i->link); checksum += i->buf_addr[0]; - ACCESS_ONCE(ads->data0) = i->buf_addr[0]; + WRITE_ONCE(ads->data0, i->buf_addr[0]); checksum += i->buf_addr[1]; - ACCESS_ONCE(ads->data1) = i->buf_addr[1]; + WRITE_ONCE(ads->data1, i->buf_addr[1]); checksum += i->buf_addr[2]; - ACCESS_ONCE(ads->data2) = i->buf_addr[2]; + WRITE_ONCE(ads->data2, i->buf_addr[2]); checksum += i->buf_addr[3]; - ACCESS_ONCE(ads->data3) = i->buf_addr[3]; + WRITE_ONCE(ads->data3, i->buf_addr[3]); checksum += (val = (i->buf_len[0] << AR_BufLen_S) & AR_BufLen); - ACCESS_ONCE(ads->ctl3) = val; + WRITE_ONCE(ads->ctl3, val); checksum += (val = (i->buf_len[1] << AR_BufLen_S) & AR_BufLen); - ACCESS_ONCE(ads->ctl5) = val; + WRITE_ONCE(ads->ctl5, val); checksum += (val = (i->buf_len[2] << AR_BufLen_S) & AR_BufLen); - ACCESS_ONCE(ads->ctl7) = val; + WRITE_ONCE(ads->ctl7, val); checksum += (val = (i->buf_len[3] << AR_BufLen_S) & AR_BufLen); - ACCESS_ONCE(ads->ctl9) = val; + WRITE_ONCE(ads->ctl9, val); checksum = (u16) (((checksum & 0xffff) + (checksum >> 16)) & 0xffff); - ACCESS_ONCE(ads->ctl10) = checksum; + WRITE_ONCE(ads->ctl10, checksum); if (i->is_first || i->is_last) { - ACCESS_ONCE(ads->ctl13) = set11nTries(i->rates, 0) + WRITE_ONCE(ads->ctl13, 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->ctl14) = set11nRate(i->rates, 0) + WRITE_ONCE(ads->ctl14, set11nRate(i->rates, 0) | set11nRate(i->rates, 1) | set11nRate(i->rates, 2) - | set11nRate(i->rates, 3); + | set11nRate(i->rates, 3)); } else { - ACCESS_ONCE(ads->ctl13) = 0; - ACCESS_ONCE(ads->ctl14) = 0; + WRITE_ONCE(ads->ctl13, 0); + WRITE_ONCE(ads->ctl14, 0); } ads->ctl20 = 0; @@ -89,17 +89,17 @@ ar9003_set_txdesc(struct ath_hw *ah, void *ds, struct ath_tx_info *i) ctl17 = SM(i->keytype, AR_EncrType); if (!i->is_first) { - ACCESS_ONCE(ads->ctl11) = 0; - ACCESS_ONCE(ads->ctl12) = i->is_last ? 0 : AR_TxMore; - ACCESS_ONCE(ads->ctl15) = 0; - ACCESS_ONCE(ads->ctl16) = 0; - ACCESS_ONCE(ads->ctl17) = ctl17; - ACCESS_ONCE(ads->ctl18) = 0; - ACCESS_ONCE(ads->ctl19) = 0; + WRITE_ONCE(ads->ctl11, 0); + WRITE_ONCE(ads->ctl12, i->is_last ? 0 : AR_TxMore); + WRITE_ONCE(ads->ctl15, 0); + WRITE_ONCE(ads->ctl16, 0); + WRITE_ONCE(ads->ctl17, ctl17); + WRITE_ONCE(ads->ctl18, 0); + WRITE_ONCE(ads->ctl19, 0); return; } - ACCESS_ONCE(ads->ctl11) = (i->pkt_len & AR_FrameLen) + WRITE_ONCE(ads->ctl11, (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) @@ -107,7 +107,7 @@ ar9003_set_txdesc(struct ath_hw *ah, void *ds, struct ath_tx_info *i) | (i->flags & ATH9K_TXDESC_LOWRXCHAIN ? AR_LowRxChain : 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))); ctl12 = (i->keyix != ATH9K_TXKEYIX_INVALID ? SM(i->keyix, AR_DestIdx) : 0) @@ -135,26 +135,26 @@ ar9003_set_txdesc(struct ath_hw *ah, void *ds, struct ath_tx_info *i) val = (i->flags & ATH9K_TXDESC_PAPRD) >> ATH9K_TXDESC_PAPRD_S; ctl12 |= SM(val, AR_PAPRDChainMask); - ACCESS_ONCE(ads->ctl12) = ctl12; - ACCESS_ONCE(ads->ctl17) = ctl17; + WRITE_ONCE(ads->ctl12, ctl12); + WRITE_ONCE(ads->ctl17, ctl17); - ACCESS_ONCE(ads->ctl15) = set11nPktDurRTSCTS(i->rates, 0) - | set11nPktDurRTSCTS(i->rates, 1); + WRITE_ONCE(ads->ctl15, set11nPktDurRTSCTS(i->rates, 0) + | set11nPktDurRTSCTS(i->rates, 1)); - ACCESS_ONCE(ads->ctl16) = set11nPktDurRTSCTS(i->rates, 2) - | set11nPktDurRTSCTS(i->rates, 3); + WRITE_ONCE(ads->ctl16, set11nPktDurRTSCTS(i->rates, 2) + | set11nPktDurRTSCTS(i->rates, 3)); - ACCESS_ONCE(ads->ctl18) = set11nRateFlags(i->rates, 0) + WRITE_ONCE(ads->ctl18, 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->ctl19) = AR_Not_Sounding; + WRITE_ONCE(ads->ctl19, AR_Not_Sounding); - ACCESS_ONCE(ads->ctl20) = SM(i->txpower[1], AR_XmitPower1); - ACCESS_ONCE(ads->ctl21) = SM(i->txpower[2], AR_XmitPower2); - ACCESS_ONCE(ads->ctl22) = SM(i->txpower[3], AR_XmitPower3); + WRITE_ONCE(ads->ctl20, SM(i->txpower[1], AR_XmitPower1)); + WRITE_ONCE(ads->ctl21, SM(i->txpower[2], AR_XmitPower2)); + WRITE_ONCE(ads->ctl22, SM(i->txpower[3], AR_XmitPower3)); } static u16 ar9003_calc_ptr_chksum(struct ar9003_txc *ads) @@ -359,7 +359,7 @@ static int ar9003_hw_proc_txdesc(struct ath_hw *ah, void *ds, ads = &ah->ts_ring[ah->ts_tail]; - status = ACCESS_ONCE(ads->status8); + status = READ_ONCE(ads->status8); if ((status & AR_TxDone) == 0) return -EINPROGRESS; @@ -385,7 +385,7 @@ static int ar9003_hw_proc_txdesc(struct ath_hw *ah, void *ds, if (status & AR_TxOpExceeded) ts->ts_status |= ATH9K_TXERR_XTXOP; - status = ACCESS_ONCE(ads->status2); + status = READ_ONCE(ads->status2); ts->ts_rssi_ctl0 = MS(status, AR_TxRSSIAnt00); ts->ts_rssi_ctl1 = MS(status, AR_TxRSSIAnt01); ts->ts_rssi_ctl2 = MS(status, AR_TxRSSIAnt02); @@ -395,7 +395,7 @@ static int ar9003_hw_proc_txdesc(struct ath_hw *ah, void *ds, ts->ba_high = ads->status6; } - status = ACCESS_ONCE(ads->status3); + status = READ_ONCE(ads->status3); if (status & AR_ExcessiveRetries) ts->ts_status |= ATH9K_TXERR_XRETRY; if (status & AR_Filtered) @@ -420,7 +420,7 @@ static int ar9003_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->status7); + status = READ_ONCE(ads->status7); ts->ts_rssi = MS(status, AR_TxRSSICombined); ts->ts_rssi_ext0 = MS(status, AR_TxRSSIAnt10); ts->ts_rssi_ext1 = MS(status, AR_TxRSSIAnt11); @@ -437,13 +437,13 @@ static int ar9003_hw_get_duration(struct ath_hw *ah, const void *ds, int index) switch (index) { case 0: - return MS(ACCESS_ONCE(adc->ctl15), AR_PacketDur0); + return MS(READ_ONCE(adc->ctl15), AR_PacketDur0); case 1: - return MS(ACCESS_ONCE(adc->ctl15), AR_PacketDur1); + return MS(READ_ONCE(adc->ctl15), AR_PacketDur1); case 2: - return MS(ACCESS_ONCE(adc->ctl16), AR_PacketDur2); + return MS(READ_ONCE(adc->ctl16), AR_PacketDur2); case 3: - return MS(ACCESS_ONCE(adc->ctl16), AR_PacketDur3); + return MS(READ_ONCE(adc->ctl16), AR_PacketDur3); default: return 0; } -- 2.20.1