Delete unnecessary spin_lock for accessing Message Object. Since all message objects are divided into tx/rx area completely, spin_lock processing is unnecessary.
Signed-off-by: Tomoya MORINAGA <[email protected]> --- drivers/net/can/pch_can.c | 31 ------------------------------- 1 files changed, 0 insertions(+), 31 deletions(-) diff --git a/drivers/net/can/pch_can.c b/drivers/net/can/pch_can.c index 7c182b8..843bbce 100644 --- a/drivers/net/can/pch_can.c +++ b/drivers/net/can/pch_can.c @@ -176,7 +176,6 @@ struct pch_can_priv { unsigned int int_enables; unsigned int int_stat; struct net_device *ndev; - spinlock_t msgif_reg_lock; /* Message Interface Registers Access Lock*/ unsigned int msg_obj[PCH_TX_OBJ_END]; struct pch_can_regs __iomem *regs; struct napi_struct napi; @@ -307,7 +306,6 @@ static void pch_can_check_if_busy(u32 __iomem *creq_addr, u32 num) static void pch_can_set_rxtx(struct pch_can_priv *priv, u32 buff_num, int set, enum pch_ifreg dir) { - unsigned long flags; u32 ie; if (dir) @@ -315,7 +313,6 @@ static void pch_can_set_rxtx(struct pch_can_priv *priv, u32 buff_num, else ie = PCH_IF_MCONT_RXIE; - spin_lock_irqsave(&priv->msgif_reg_lock, flags); /* Reading the receive buffer data from RAM to Interface1 registers */ iowrite32(PCH_CMASK_RX_TX_GET, &priv->regs->ifregs[dir].cmask); pch_can_check_if_busy(&priv->regs->ifregs[dir].creq, buff_num); @@ -336,7 +333,6 @@ static void pch_can_set_rxtx(struct pch_can_priv *priv, u32 buff_num, } pch_can_check_if_busy(&priv->regs->ifregs[dir].creq, buff_num); - spin_unlock_irqrestore(&priv->msgif_reg_lock, flags); } @@ -360,7 +356,6 @@ static void pch_can_set_tx_all(struct pch_can_priv *priv, int set) static u32 pch_can_get_rxtx_ir(struct pch_can_priv *priv, u32 buff_num, u32 dir) { - unsigned long flags; u32 ie, enable; if (dir) @@ -368,7 +363,6 @@ static u32 pch_can_get_rxtx_ir(struct pch_can_priv *priv, u32 buff_num, u32 dir) else ie = PCH_IF_MCONT_TXIE; - spin_lock_irqsave(&priv->msgif_reg_lock, flags); iowrite32(PCH_CMASK_RX_TX_GET, &priv->regs->ifregs[dir].cmask); pch_can_check_if_busy(&priv->regs->ifregs[dir].creq, buff_num); @@ -378,7 +372,6 @@ static u32 pch_can_get_rxtx_ir(struct pch_can_priv *priv, u32 buff_num, u32 dir) } else { enable = 0; } - spin_unlock_irqrestore(&priv->msgif_reg_lock, flags); return enable; } @@ -390,9 +383,6 @@ static int pch_can_int_pending(struct pch_can_priv *priv) static void pch_can_set_rx_buffer_link(struct pch_can_priv *priv, u32 buffer_num, int set) { - unsigned long flags; - - spin_lock_irqsave(&priv->msgif_reg_lock, flags); iowrite32(PCH_CMASK_RX_TX_GET, &priv->regs->ifregs[0].cmask); pch_can_check_if_busy(&priv->regs->ifregs[0].creq, buffer_num); iowrite32(PCH_CMASK_RDWR | PCH_CMASK_CTRL, @@ -404,15 +394,12 @@ static void pch_can_set_rx_buffer_link(struct pch_can_priv *priv, pch_can_bit_set(&priv->regs->ifregs[0].mcont, PCH_IF_MCONT_EOB); pch_can_check_if_busy(&priv->regs->ifregs[0].creq, buffer_num); - spin_unlock_irqrestore(&priv->msgif_reg_lock, flags); } static u32 pch_can_get_rx_buffer_link(struct pch_can_priv *priv, u32 buffer_num) { - unsigned long flags; u32 link; - spin_lock_irqsave(&priv->msgif_reg_lock, flags); iowrite32(PCH_CMASK_RX_TX_GET, &priv->regs->ifregs[0].cmask); pch_can_check_if_busy(&priv->regs->ifregs[0].creq, buffer_num); @@ -420,7 +407,6 @@ static u32 pch_can_get_rx_buffer_link(struct pch_can_priv *priv, u32 buffer_num) link = 0; else link = 1; - spin_unlock_irqrestore(&priv->msgif_reg_lock, flags); return link; } @@ -466,9 +452,6 @@ static void pch_can_clear_buffers(struct pch_can_priv *priv) static void pch_can_config_rx_tx_buffers(struct pch_can_priv *priv) { int i; - unsigned long flags; - - spin_lock_irqsave(&priv->msgif_reg_lock, flags); for (i = PCH_RX_OBJ_START; i <= PCH_RX_OBJ_END; i++) { iowrite32(PCH_CMASK_RX_TX_GET, @@ -527,7 +510,6 @@ static void pch_can_config_rx_tx_buffers(struct pch_can_priv *priv) pch_can_check_if_busy(&priv->regs->ifregs[1].creq, i); } - spin_unlock_irqrestore(&priv->msgif_reg_lock, flags); } static void pch_can_init(struct pch_can_priv *priv) @@ -846,7 +828,6 @@ static int pch_can_rx_poll(struct napi_struct *napi, int quota) u32 int_stat; int rcv_pkts = 0; u32 reg_stat; - unsigned long flags; int_stat = pch_can_int_pending(priv); if (!int_stat) @@ -861,12 +842,10 @@ INT_STAT: } if (reg_stat & PCH_TX_OK) { - spin_lock_irqsave(&priv->msgif_reg_lock, flags); iowrite32(PCH_CMASK_RX_TX_GET, &priv->regs->ifregs[1].cmask); pch_can_check_if_busy(&priv->regs->ifregs[1].creq, ioread32(&priv->regs->intr)); - spin_unlock_irqrestore(&priv->msgif_reg_lock, flags); pch_can_bit_clear(&priv->regs->stat, PCH_TX_OK); } @@ -880,22 +859,18 @@ INT_STAT: MSG_OBJ: if ((int_stat >= PCH_RX_OBJ_START) && (int_stat <= PCH_RX_OBJ_END)) { - spin_lock_irqsave(&priv->msgif_reg_lock, flags); rcv_pkts = pch_can_rx_normal(ndev, int_stat); - spin_unlock_irqrestore(&priv->msgif_reg_lock, flags); if (rcv_pkts < 0) return 0; } else if ((int_stat >= PCH_TX_OBJ_START) && (int_stat <= PCH_TX_OBJ_END)) { /* Handle transmission interrupt */ can_get_echo_skb(ndev, int_stat - PCH_RX_OBJ_END - 1); - spin_lock_irqsave(&priv->msgif_reg_lock, flags); iowrite32(PCH_CMASK_RX_TX_GET | PCH_CMASK_CLRINTPND, &priv->regs->ifregs[1].cmask); dlc = ioread32(&priv->regs->ifregs[1].mcont) & PCH_IF_MCONT_DLC; pch_can_check_if_busy(&priv->regs->ifregs[1].creq, int_stat); - spin_unlock_irqrestore(&priv->msgif_reg_lock, flags); if (dlc > 8) dlc = 8; stats->tx_bytes += dlc; @@ -1043,7 +1018,6 @@ static int pch_close(struct net_device *ndev) static netdev_tx_t pch_xmit(struct sk_buff *skb, struct net_device *ndev) { int i, j; - unsigned long flags; struct pch_can_priv *priv = netdev_priv(ndev); struct can_frame *cf = (struct can_frame *)skb->data; int tx_obj_no = 0; @@ -1062,9 +1036,6 @@ static netdev_tx_t pch_xmit(struct sk_buff *skb, struct net_device *ndev) priv->tx_obj++; } - /* Attaining the lock. */ - spin_lock_irqsave(&priv->msgif_reg_lock, flags); - /* Reading the Msg Obj from the Msg RAM to the Interface register. */ iowrite32(PCH_CMASK_RX_TX_GET, &priv->regs->ifregs[1].cmask); pch_can_check_if_busy(&priv->regs->ifregs[1].creq, tx_obj_no); @@ -1116,8 +1087,6 @@ static netdev_tx_t pch_xmit(struct sk_buff *skb, struct net_device *ndev) pch_can_check_if_busy(&priv->regs->ifregs[1].creq, tx_obj_no); - spin_unlock_irqrestore(&priv->msgif_reg_lock, flags); - return NETDEV_TX_OK; } -- 1.6.0.6 _______________________________________________ Socketcan-core mailing list [email protected] https://lists.berlios.de/mailman/listinfo/socketcan-core
