From: Pankaj Bansal pankaj.bansal@nxp.com

Unlock the MB irrespective of reception method being FIFO or timestamp based. It is optional but recommended to unlock Mailbox as soon as possible and make it available for reception.

Reported-by: Alexander Stein alexander.stein@systec-electronic.com Signed-off-by: Pankaj Bansal pankaj.bansal@nxp.com Cc: linux-stable stable@vger.kernel.org Signed-off-by: Marc Kleine-Budde mkl@pengutronix.de --- drivers/net/can/flexcan.c | 7 ++++++- 1 file changed, 6 insertions(+), 1 deletion(-)

diff --git a/drivers/net/can/flexcan.c b/drivers/net/can/flexcan.c index 8e972ef08637..0431f8d05518 100644 --- a/drivers/net/can/flexcan.c +++ b/drivers/net/can/flexcan.c @@ -720,9 +720,14 @@ static unsigned int flexcan_mailbox_read(struct can_rx_offload *offload, priv->write(BIT(n - 32), &regs->iflag2); } else { priv->write(FLEXCAN_IFLAG_RX_FIFO_AVAILABLE, &regs->iflag1); - priv->read(&regs->timer); }

+ /* Read the Free Running Timer. It is optional but recommended + * to unlock Mailbox as soon as possible and make it available + * for reception. + */ + priv->read(&regs->timer); + return 1; }