4.19-stable review patch. If anyone has any objections, please let me know.
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From: Pankaj Bansal pankaj.bansal@nxp.com
commit 5178b7cd8e42448b1041716f124734eaaa36ca50 upstream.
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 Signed-off-by: Greg Kroah-Hartman gregkh@linuxfoundation.org
--- drivers/net/can/flexcan.c | 7 ++++++- 1 file changed, 6 insertions(+), 1 deletion(-)
--- a/drivers/net/can/flexcan.c +++ b/drivers/net/can/flexcan.c @@ -720,9 +720,14 @@ static unsigned int flexcan_mailbox_read priv->write(BIT(n - 32), ®s->iflag2); } else { priv->write(FLEXCAN_IFLAG_RX_FIFO_AVAILABLE, ®s->iflag1); - priv->read(®s->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(®s->timer); + return 1; }