From: Sasha Levin <sashal@kernel.org>
To: linux-kernel@vger.kernel.org, stable@vger.kernel.org
Cc: Heiner Kallweit <hkallweit1@gmail.com>,
Jakub Kicinski <kuba@kernel.org>, Sasha Levin <sashal@kernel.org>,
netdev@vger.kernel.org
Subject: [PATCH AUTOSEL 5.4 036/130] r8169: use READ_ONCE in rtl_tx_slots_avail
Date: Tue, 22 Dec 2020 21:16:39 -0500 [thread overview]
Message-ID: <20201223021813.2791612-36-sashal@kernel.org> (raw)
In-Reply-To: <20201223021813.2791612-1-sashal@kernel.org>
From: Heiner Kallweit <hkallweit1@gmail.com>
[ Upstream commit 95f3c5458dfa5856bb110e31d156e00d894d0134 ]
tp->dirty_tx and tp->cur_tx may be changed by a racing rtl_tx() or
rtl8169_start_xmit(). Use READ_ONCE() to annotate the races and ensure
that the compiler doesn't use cached values.
Signed-off-by: Heiner Kallweit <hkallweit1@gmail.com>
Link: https://lore.kernel.org/r/5676fee3-f6b4-84f2-eba5-c64949a371ad@gmail.com
Signed-off-by: Jakub Kicinski <kuba@kernel.org>
Signed-off-by: Sasha Levin <sashal@kernel.org>
---
drivers/net/ethernet/realtek/r8169_main.c | 3 ++-
1 file changed, 2 insertions(+), 1 deletion(-)
diff --git a/drivers/net/ethernet/realtek/r8169_main.c b/drivers/net/ethernet/realtek/r8169_main.c
index fd5adb0c54d29..fca8252b4f21d 100644
--- a/drivers/net/ethernet/realtek/r8169_main.c
+++ b/drivers/net/ethernet/realtek/r8169_main.c
@@ -5856,7 +5856,8 @@ static bool rtl8169_tso_csum_v2(struct rtl8169_private *tp,
static bool rtl_tx_slots_avail(struct rtl8169_private *tp,
unsigned int nr_frags)
{
- unsigned int slots_avail = tp->dirty_tx + NUM_TX_DESC - tp->cur_tx;
+ unsigned int slots_avail = READ_ONCE(tp->dirty_tx) + NUM_TX_DESC
+ - READ_ONCE(tp->cur_tx);
/* A skbuff with nr_frags needs nr_frags+1 entries in the tx queue */
return slots_avail > nr_frags;
--
2.27.0
next prev parent reply other threads:[~2020-12-23 3:03 UTC|newest]
Thread overview: 42+ messages / expand[flat|nested] mbox.gz Atom feed top
[not found] <20201223021813.2791612-1-sashal@kernel.org>
2020-12-23 2:16 ` [PATCH AUTOSEL 5.4 008/130] staging: wimax: depends on NET Sasha Levin
2020-12-23 7:29 ` Greg Kroah-Hartman
2020-12-23 14:15 ` Sasha Levin
2020-12-23 2:16 ` [PATCH AUTOSEL 5.4 015/130] mac80211: don't overwrite QoS TID of injected frames Sasha Levin
2020-12-23 2:16 ` [PATCH AUTOSEL 5.4 023/130] rsi: Fix TX EAPOL packet handling against iwlwifi AP Sasha Levin
2020-12-23 2:16 ` [PATCH AUTOSEL 5.4 027/130] Bluetooth: hidp: use correct wait queue when removing ctrl_wait Sasha Levin
2020-12-23 2:16 ` [PATCH AUTOSEL 5.4 029/130] net: skb_vlan_untag(): don't reset transport offset if set by GRO layer Sasha Levin
2020-12-23 2:16 ` [PATCH AUTOSEL 5.4 031/130] mwifiex: pcie: skip cancel_work_sync() on reset failure path Sasha Levin
2020-12-23 2:16 ` [PATCH AUTOSEL 5.4 034/130] net: ipconfig: Avoid spurious blank lines in boot log Sasha Levin
2020-12-23 2:16 ` Sasha Levin [this message]
2020-12-23 2:16 ` [PATCH AUTOSEL 5.4 052/130] net: dsa: avoid potential use-after-free error Sasha Levin
2020-12-23 2:17 ` [PATCH AUTOSEL 5.4 058/130] rxrpc: Don't leak the service-side session key to userspace Sasha Levin
2020-12-23 2:17 ` [PATCH AUTOSEL 5.4 060/130] rtw88: coex: change the decode method from firmware Sasha Levin
2020-12-23 2:17 ` [PATCH AUTOSEL 5.4 067/130] brcmsmac: ampdu: Check BA window size before checking block ack Sasha Levin
2020-12-23 2:17 ` [PATCH AUTOSEL 5.4 068/130] i40e: report correct VF link speed when link state is set to enable Sasha Levin
2020-12-23 2:17 ` [PATCH AUTOSEL 5.4 069/130] hv_netvsc: Validate number of allocated sub-channels Sasha Levin
2020-12-23 2:17 ` [PATCH AUTOSEL 5.4 075/130] net/lapb: fix t1 timer handling for LAPB_STATE_0 Sasha Levin
2020-12-23 17:01 ` Xie He
2020-12-24 9:49 ` Xie He
2020-12-27 21:27 ` Sasha Levin
2021-01-06 7:33 ` Martin Schiller
2020-12-23 2:17 ` [PATCH AUTOSEL 5.4 081/130] bridge: switchdev: Notify about VLAN protocol changes Sasha Levin
2020-12-23 2:17 ` [PATCH AUTOSEL 5.4 094/130] mwifiex: Fix possible buffer overflows in mwifiex_cmd_802_11_ad_hoc_start Sasha Levin
2020-12-23 2:17 ` [PATCH AUTOSEL 5.4 097/130] rtlwifi: rtl8192de: fix ofdm power compensation Sasha Levin
2020-12-23 2:17 ` [PATCH AUTOSEL 5.4 106/130] iwlwifi: avoid endless HW errors at assert time Sasha Levin
2020-12-23 2:17 ` [PATCH AUTOSEL 5.4 107/130] iwlwifi: validate MPDU length against notification length Sasha Levin
2020-12-23 2:17 ` [PATCH AUTOSEL 5.4 108/130] iwlwifi: pcie: validate RX descriptor length Sasha Levin
2020-12-23 2:17 ` [PATCH AUTOSEL 5.4 109/130] iwlwifi: mvm: fix 22000 series driver NMI Sasha Levin
2020-12-23 2:17 ` [PATCH AUTOSEL 5.4 110/130] iwlwifi: trans: consider firmware dead after errors Sasha Levin
2020-12-23 2:17 ` [PATCH AUTOSEL 5.4 111/130] iwlwifi: mvm: validate firmware sync response size Sasha Levin
2020-12-23 2:17 ` [PATCH AUTOSEL 5.4 112/130] iwlwifi: add an extra firmware state in the transport Sasha Levin
2020-12-23 2:17 ` [PATCH AUTOSEL 5.4 113/130] iwlwifi: mvm: disconnect if channel switch delay is too long Sasha Levin
2020-12-23 2:17 ` [PATCH AUTOSEL 5.4 116/130] cfg80211: Update TSF and TSF BSSID for multi BSS Sasha Levin
2020-12-23 2:18 ` [PATCH AUTOSEL 5.4 117/130] nl80211: always accept scan request with the duration set Sasha Levin
2020-12-23 2:18 ` [PATCH AUTOSEL 5.4 118/130] cfg80211: Save the regulatory domain when setting custom regulatory Sasha Levin
2020-12-23 2:18 ` [PATCH AUTOSEL 5.4 119/130] mac80211: disallow band-switch during CSA Sasha Levin
2020-12-23 2:18 ` [PATCH AUTOSEL 5.4 120/130] mac80211: support Rx timestamp calculation for all preamble types Sasha Levin
2020-12-23 2:18 ` [PATCH AUTOSEL 5.4 121/130] mac80211: use bitfield helpers for BA session action frames Sasha Levin
2020-12-23 2:18 ` [PATCH AUTOSEL 5.4 122/130] mac80211: ignore country element TX power on 6 GHz Sasha Levin
2020-12-23 2:18 ` [PATCH AUTOSEL 5.4 123/130] mac80211: Fix calculation of minimal channel width Sasha Levin
2020-12-23 2:18 ` [PATCH AUTOSEL 5.4 124/130] mac80211: don't filter out beacons once we start CSA Sasha Levin
2020-12-23 2:18 ` [PATCH AUTOSEL 5.4 125/130] mac80211: Update rate control on channel change Sasha Levin
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