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

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Date:   Tue, 24 Oct 2017 15:07:03 +0200
From:   Greg Kroah-Hartman <gregkh@...uxfoundation.org>
To:     linux-kernel@...r.kernel.org
Cc:     Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
        stable@...r.kernel.org, Zhu Yi <yi.zhu5@...bosch.com>,
        Mark Jonas <mark.jonas@...bosch.com>,
        Wolfgang Grandegger <wg@...ndegger.com>,
        Marc Kleine-Budde <mkl@...gutronix.de>
Subject: [PATCH 4.13 29/85] can: flexcan: fix state transition regression

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

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

From: ZHU Yi (ST-FIR/ENG1-Zhu) <Yi.Zhu5@...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.zhu5@...bosch.com>
Signed-off-by: Mark Jonas <mark.jonas@...bosch.com>
Acked-by: Wolfgang Grandegger <wg@...ndegger.com>
Signed-off-by: Marc Kleine-Budde <mkl@...gutronix.de>
Signed-off-by: Greg Kroah-Hartman <gregkh@...uxfoundation.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 */