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From 1a92e5a9109963e2491eec111b84b35b4e2adc8f Mon Sep 17 00:00:00 2001
From: Marc Kleine-Budde <mkl@pengutronix.de>
Date: Wed, 9 Oct 2019 15:15:37 +0200
Subject: [PATCH] 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>
---
drivers/net/can/flexcan.c | 4 ++--
1 file changed, 2 insertions(+), 2 deletions(-)
--- a/drivers/net/can/flexcan.c
+++ b/drivers/net/can/flexcan.c
@@ -743,8 +743,6 @@ static void flexcan_irq_state(struct net
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
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;
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