Currently the driver waits to wakeup the queue until the interrupt for the transmit event is received and acknowledged. If we want to use the hardware FIFO, this is too late. Instead release the queue as soon as the transmit was transferred into the hardware FIFO. We are then ready for the next transmit to be transferred. Signed-off-by: Markus Schneider-Pargmann <msp@xxxxxxxxxxxx> --- drivers/net/can/m_can/m_can.c | 7 ++++--- 1 file changed, 4 insertions(+), 3 deletions(-) diff --git a/drivers/net/can/m_can/m_can.c b/drivers/net/can/m_can/m_can.c index 2c01e3f7b23f..4adf03111782 100644 --- a/drivers/net/can/m_can/m_can.c +++ b/drivers/net/can/m_can/m_can.c @@ -1097,10 +1097,9 @@ static irqreturn_t m_can_isr(int irq, void *dev_id) /* New TX FIFO Element arrived */ if (m_can_echo_tx_event(dev) != 0) goto out_fail; - - if (netif_queue_stopped(dev) && - !m_can_tx_fifo_full(cdev)) + if (!cdev->tx_skb && netif_queue_stopped(dev)) netif_wake_queue(dev); + } } @@ -1705,6 +1704,8 @@ static netdev_tx_t m_can_tx_handler(struct m_can_classdev *cdev) if (m_can_tx_fifo_full(cdev) || m_can_next_echo_skb_occupied(dev, putidx)) netif_stop_queue(dev); + else if (cdev->is_peripheral && !cdev->tx_skb && netif_queue_stopped(dev)) + netif_wake_queue(dev); } return NETDEV_TX_OK; -- 2.38.1
