| lists.openwall.net | lists / announce owl-users owl-dev john-users john-dev passwdqc-users yescrypt popa3d-users / oss-security kernel-hardening musl sabotage tlsify passwords / crypt-dev xvendor / Bugtraq Full-Disclosure linux-kernel linux-netdev linux-ext4 linux-hardening linux-cve-announce PHC | |
|
Open Source and information security mailing list archives
| ||
|
Date: Fri, 14 Apr 2017 12:49:04 -0400
From: Nathan Fontenot <nfont@...ux.vnet.ibm.com>
To: brking@...ux.vnet.ibm.com, netdev@...r.kernel.org
Cc: jallen@...ux.vnet.ibm.com, tlfalcon@...ux.vnet.ibm.com
Subject: [PATCH net-next] ibmvnic: Fixup atomic API usage
From: Brian King <brking@...ux.vnet.ibm.com>
Replace a couple of modifications of an atomic followed
by a read of the atomic, which is no longer atomic, to
use atomic_XX_return variants to avoid race conditions.
Signed-off-by: Brian King <brking@...ux.vnet.ibm.com>
Signed-off-by: Nathan Fontenot <nfont@...ux.vnet.ibm.com>
---
drivers/net/ethernet/ibm/ibmvnic.c | 10 ++++------
1 file changed, 4 insertions(+), 6 deletions(-)
diff --git a/drivers/net/ethernet/ibm/ibmvnic.c b/drivers/net/ethernet/ibm/ibmvnic.c
index c10bae7..b5871df 100644
--- a/drivers/net/ethernet/ibm/ibmvnic.c
+++ b/drivers/net/ethernet/ibm/ibmvnic.c
@@ -962,9 +962,8 @@ static int ibmvnic_xmit(struct sk_buff *skb, struct net_device *netdev)
goto out;
}
- atomic_inc(&tx_scrq->used);
-
- if (atomic_read(&tx_scrq->used) >= adapter->req_tx_entries_per_subcrq) {
+ if (atomic_inc_return(&tx_scrq->used)
+ >= adapter->req_tx_entries_per_subcrq) {
netdev_info(netdev, "Stopping queue %d\n", queue_num);
netif_stop_subqueue(netdev, queue_num);
}
@@ -1499,9 +1498,8 @@ static int ibmvnic_complete_tx(struct ibmvnic_adapter *adapter,
}
if (txbuff->last_frag) {
- atomic_dec(&scrq->used);
-
- if (atomic_read(&scrq->used) <=
+ if (atomic_sub_return(next->tx_comp.num_comps,
+ &scrq->used) <=
(adapter->req_tx_entries_per_subcrq / 2) &&
netif_subqueue_stopped(adapter->netdev,
txbuff->skb)) {
Powered by blists - more mailing lists