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Subject[PATCH 4.19 056/110] can: flexcan: handle tx-complete CAN frames via rx-offload infrastructure
Date
4.19-stable review patch.  If anyone has any objections, please let me know.

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

From: Oleksij Rempel <o.rempel@pengutronix.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@pengutronix.de>
Cc: linux-stable <stable@vger.kernel.org>
Signed-off-by: Marc Kleine-Budde <mkl@pengutronix.de>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.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);


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