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can: flexcan: flexcan_irq_state(): only read timestamp if needed

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The function flexcan_irq_state() checks the controller for CAN state
changes and pushes a skb with the new state and a timestamp into the
rx-offload framework.

This patch optimizes the function by only reading the timestamp, if a
state change is detected.

Signed-off-by: Marc Kleine-Budde <mkl@pengutronix.de>
This commit is contained in:
Marc Kleine-Budde 2019-10-09 15:15:37 +02:00
parent a4721f27b9
commit 58ed8e77d3
1 changed files with 2 additions and 2 deletions
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4
drivers/net/can/flexcan.c
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@ -743,8 +743,6 @@ static void flexcan_irq_state(struct net_device *dev, u32 reg_esr)
u32 timestamp;
int err;
timestamp = priv->read(&regs->timer) << 16;
flt = reg_esr & FLEXCAN_ESR_FLT_CONF_MASK;
if (likely(flt == FLEXCAN_ESR_FLT_CONF_ACTIVE)) {
tx_state = unlikely(reg_esr & FLEXCAN_ESR_TX_WRN) ?
@ -764,6 +762,8 @@ static void flexcan_irq_state(struct net_device *dev, u32 reg_esr)
if (likely(new_state == priv->can.state))
return;
timestamp = priv->read(&regs->timer) << 16;
skb = alloc_can_err_skb(dev, &cf);
if (unlikely(!skb))
return;