From: Michael S. Tsirkin Date: Thu, 24 Nov 2016 05:04:08 +0000 (+0200) Subject: netdevice: fix sparse warning for HARD_TX_LOCK X-Git-Tag: Ubuntu-5.2.0-15.16~7929^2~179 X-Git-Url: https://git.proxmox.com/?a=commitdiff_plain;h=5a717f4f8f2830f297b5511022481bdc27b9d576;p=mirror_ubuntu-eoan-kernel.git 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 Signed-off-by: David S. Miller --- 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); \ } \ }