linux-kernel - [PATCH 4.19 056/110] can: flexcan: handle tx-complete CAN frames via rx-offload infrastructure

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Date:   Thu, 29 Nov 2018 15:12:27 +0100
From:   Greg Kroah-Hartman <gregkh@...uxfoundation.org>
To:     linux-kernel@...r.kernel.org
Cc:     Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
        stable@...r.kernel.org, Oleksij Rempel <o.rempel@...gutronix.de>,
        Marc Kleine-Budde <mkl@...gutronix.de>
Subject: [PATCH 4.19 056/110] can: flexcan: handle tx-complete CAN frames via rx-offload infrastructure

4.19-stable review patch.  If anyone has any objections, please let me know.

------------------

From: Oleksij Rempel <o.rempel@...gutronix.de>

commit ed72bc8bcb9277061e753faf300b20f97323761c upstream.

Current flexcan driver will put TX-ECHO in regular unsorted way, in
this case TX-ECHO can come after the response to the same TXed message.
In some cases, for example for J1939 stack, things will break.
This patch is using new rx-offload API to put the messages just in the
right place.

Signed-off-by: Oleksij Rempel <o.rempel@...gutronix.de>
Cc: linux-stable <stable@...r.kernel.org>
Signed-off-by: Marc Kleine-Budde <mkl@...gutronix.de>
Signed-off-by: Greg Kroah-Hartman <gregkh@...uxfoundation.org>

---
 drivers/net/can/flexcan.c |    5 ++++-
 1 file changed, 4 insertions(+), 1 deletion(-)

--- a/drivers/net/can/flexcan.c
+++ b/drivers/net/can/flexcan.c
@@ -794,8 +794,11 @@ static irqreturn_t flexcan_irq(int irq,
 
 	/* transmission complete interrupt */
 	if (reg_iflag1 & FLEXCAN_IFLAG_MB(priv->tx_mb_idx)) {
+		u32 reg_ctrl = priv->read(&regs->mb[FLEXCAN_TX_MB].can_ctrl);
+
 		handled = IRQ_HANDLED;
-		stats->tx_bytes += can_get_echo_skb(dev, 0);
+		stats->tx_bytes += can_rx_offload_get_echo_skb(&priv->offload,
+							       0, reg_ctrl << 16);
 		stats->tx_packets++;
 		can_led_event(dev, CAN_LED_EVENT_TX);