4.17-stable review patch. If anyone has any objections, please let me know.
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From: Roman Fietze roman.fietze@telemotive.de
commit 393753b217f05474e714aea36c37501546ed1202 upstream.
Inside m_can_chip_config(), when setting up the new value of the CCCR, the CCCR_NISO bit is not cleared like the others, CCCR_TEST, CCCR_MON, CCCR_BRSE and CCCR_FDOE, before checking the can.ctrlmode bits for CAN_CTRLMODE_FD_NON_ISO.
This way once the controller was configured for CAN_CTRLMODE_FD_NON_ISO, this mode could never be cleared again.
This fix is only relevant for controllers with version 3.1.x or 3.2.x. Older versions do not support NISO.
Signed-off-by: Roman Fietze roman.fietze@telemotive.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/m_can/m_can.c | 3 ++- 1 file changed, 2 insertions(+), 1 deletion(-)
--- a/drivers/net/can/m_can/m_can.c +++ b/drivers/net/can/m_can/m_can.c @@ -1111,7 +1111,8 @@ static void m_can_chip_config(struct net
} else { /* Version 3.1.x or 3.2.x */ - cccr &= ~(CCCR_TEST | CCCR_MON | CCCR_BRSE | CCCR_FDOE); + cccr &= ~(CCCR_TEST | CCCR_MON | CCCR_BRSE | CCCR_FDOE | + CCCR_NISO);
/* Only 3.2.x has NISO Bit implemented */ if (priv->can.ctrlmode & CAN_CTRLMODE_FD_NON_ISO)