[PATCH 4.13 29/85] can: flexcan: fix state transition regression

[Greg Kroah-Hartman]

4.13-stable review patch.  If anyone has any objections, please let me know.

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

From: ZHU Yi (ST-FIR/ENG1-Zhu) <yi.z...@cn.bosch.com>

commit ad2302345d59d29232cb668baaae9e840925d153 upstream.

Update state upon any interrupt to report correct state transitions in
case the flexcan core enabled the broken error state quirk fix.

Signed-off-by: Zhu Yi <yi.z...@cn.bosch.com>
Signed-off-by: Mark Jonas <mark.jo...@de.bosch.com>
Acked-by: Wolfgang Grandegger <w...@grandegger.com>
Signed-off-by: Marc Kleine-Budde <m...@pengutronix.de>
Signed-off-by: Greg Kroah-Hartman <gre...@linuxfoundation.org>

---
 drivers/net/can/flexcan.c |    5 +++--
 1 file changed, 3 insertions(+), 2 deletions(-)

--- a/drivers/net/can/flexcan.c
+++ b/drivers/net/can/flexcan.c
@@ -765,8 +765,9 @@ static irqreturn_t flexcan_irq(int irq,
                flexcan_write(reg_esr & FLEXCAN_ESR_ALL_INT, &regs->esr);
        }
 
-       /* state change interrupt */
-       if (reg_esr & FLEXCAN_ESR_ERR_STATE)
+       /* state change interrupt or broken error state quirk fix is enabled */
+       if ((reg_esr & FLEXCAN_ESR_ERR_STATE) ||
+           (priv->devtype_data->quirks & FLEXCAN_QUIRK_BROKEN_ERR_STATE))
                flexcan_irq_state(dev, reg_esr);
 
        /* bus error IRQ - handle if bus error reporting is activated */