diff options
| author | Michael S. Tsirkin <mst@redhat.com> | 2016-11-24 08:04:08 +0300 |
|---|---|---|
| committer | David S. Miller <davem@davemloft.net> | 2016-11-27 23:28:35 +0300 |
| commit | 5a717f4f8f2830f297b5511022481bdc27b9d576 (patch) | |
| tree | 6f074433171a53cf0b3f7e590d2ab7d5a9e4877a /include/linux/netdevice.h | |
| parent | 428951161b8ab73d547c8915dcfc5fa6f10012a8 (diff) | |
| download | linux-5a717f4f8f2830f297b5511022481bdc27b9d576.tar.xz | |
netdevice: fix sparse warning for HARD_TX_LOCK
sparse warns about context imbalance in any code
that uses HARD_TX_LOCK/UNLOCK - this is because it's
unable to determine that flags don't change so
lock and unlock are paired.
Seems easy enough to fix by adding __acquire/__release
calls.
With this patch af_packet.c is now sparse-clean,
Signed-off-by: Michael S. Tsirkin <mst@redhat.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
Diffstat (limited to 'include/linux/netdevice.h')
| -rw-r--r-- | include/linux/netdevice.h | 17 |
1 files changed, 16 insertions, 1 deletions
diff --git a/include/linux/netdevice.h b/include/linux/netdevice.h index ff57cd2eba3b..4ffcd874cc20 100644 --- a/include/linux/netdevice.h +++ b/include/linux/netdevice.h @@ -3462,6 +3462,17 @@ static inline void __netif_tx_lock(struct netdev_queue *txq, int cpu) txq->xmit_lock_owner = cpu; } +static inline bool __netif_tx_acquire(struct netdev_queue *txq) +{ + __acquire(&txq->_xmit_lock); + return true; +} + +static inline void __netif_tx_release(struct netdev_queue *txq) +{ + __release(&txq->_xmit_lock); +} + static inline void __netif_tx_lock_bh(struct netdev_queue *txq) { spin_lock_bh(&txq->_xmit_lock); @@ -3563,17 +3574,21 @@ static inline void netif_tx_unlock_bh(struct net_device *dev) #define HARD_TX_LOCK(dev, txq, cpu) { \ if ((dev->features & NETIF_F_LLTX) == 0) { \ __netif_tx_lock(txq, cpu); \ + } else { \ + __netif_tx_acquire(txq); \ } \ } #define HARD_TX_TRYLOCK(dev, txq) \ (((dev->features & NETIF_F_LLTX) == 0) ? \ __netif_tx_trylock(txq) : \ - true ) + __netif_tx_acquire(txq)) #define HARD_TX_UNLOCK(dev, txq) { \ if ((dev->features & NETIF_F_LLTX) == 0) { \ __netif_tx_unlock(txq); \ + } else { \ + __netif_tx_release(txq); \ } \ } |