39 lines
1.2 KiB
Diff
39 lines
1.2 KiB
Diff
From 1a92e5a9109963e2491eec111b84b35b4e2adc8f Mon Sep 17 00:00:00 2001
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From: Marc Kleine-Budde <mkl@pengutronix.de>
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Date: Wed, 9 Oct 2019 15:15:37 +0200
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Subject: [PATCH] can: flexcan: flexcan_irq_state(): only read timestamp if
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needed
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The function flexcan_irq_state() checks the controller for CAN state
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changes and pushes a skb with the new state and a timestamp into the
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rx-offload framework.
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This patch optimizes the function by only reading the timestamp, if a
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state change is detected.
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Signed-off-by: Marc Kleine-Budde <mkl@pengutronix.de>
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---
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drivers/net/can/flexcan.c | 4 ++--
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1 file changed, 2 insertions(+), 2 deletions(-)
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--- a/drivers/net/can/flexcan.c
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+++ b/drivers/net/can/flexcan.c
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@@ -743,8 +743,6 @@ static void flexcan_irq_state(struct net
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u32 timestamp;
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int err;
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- timestamp = priv->read(®s->timer) << 16;
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-
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flt = reg_esr & FLEXCAN_ESR_FLT_CONF_MASK;
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if (likely(flt == FLEXCAN_ESR_FLT_CONF_ACTIVE)) {
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tx_state = unlikely(reg_esr & FLEXCAN_ESR_TX_WRN) ?
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@@ -764,6 +762,8 @@ static void flexcan_irq_state(struct net
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if (likely(new_state == priv->can.state))
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return;
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+ timestamp = priv->read(®s->timer) << 16;
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+
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skb = alloc_can_err_skb(dev, &cf);
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if (unlikely(!skb))
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return;
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