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| author |   Marc Kleine-Budde <mkl@pengutronix.de> | 2019-10-09 15:15:37 +0200 |
|---|---|---|
| committer | Marc Kleine-Budde <mkl@pengutronix.de> | 2019-11-11 21:58:11 +0100 |
| commit | 58ed8e77d3123acb6ece7d016c8db393d5c0d488 (patch) | |
| tree | 9b9b4732b2f102004335ac58bcb04a8cb93f9f43 /drivers/net/can/flexcan.c | |
| parent | can: flexcan: use devm_platform_ioremap_resource() to simplify code (diff) | |
| download | linux-dev-58ed8e77d3123acb6ece7d016c8db393d5c0d488.tar.xz linux-dev-58ed8e77d3123acb6ece7d016c8db393d5c0d488.zip | |
can: flexcan: flexcan_irq_state(): only read timestamp if needed
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>
Diffstat (limited to 'drivers/net/can/flexcan.c')
| -rw-r--r-- | drivers/net/can/flexcan.c | 4 |
1 files changed, 2 insertions, 2 deletions
diff --git a/drivers/net/can/flexcan.c b/drivers/net/can/flexcan.c index 362ed90c701f..148c0a3fab24 100644 --- a/drivers/net/can/flexcan.c +++ b/drivers/net/can/flexcan.c @@ -743,8 +743,6 @@ static void flexcan_irq_state(struct net_device *dev, u32 reg_esr) u32 timestamp; int err; - timestamp = priv->read(®s->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(®s->timer) << 16; + skb = alloc_can_err_skb(dev, &cf); if (unlikely(!skb)) return; |