can: m_can: m_can_rx_peripheral(): fix RX being blocked by errors

[ Upstream commit e98d9ee64ee2cc9b1d1a8e26610ec4d0392ebe50 ]

For M_CAN peripherals, m_can_rx_handler() was called with quota = 1,
which caused any error handling to block RX from taking place until
the next time the IRQ handler is called. This had been observed to
cause RX to be blocked indefinitely in some cases.

This is fixed by calling m_can_rx_handler with a sensibly high quota.

Fixes: f524f829b75a ("can: m_can: Create a m_can platform framework")
Link: https://lore.kernel.org/r/20210303144350.4093750-1-torin@maxiluxsystems.com
Suggested-by: Marc Kleine-Budde <mkl@pengutronix.de>
Signed-off-by: Torin Cooper-Bennun <torin@maxiluxsystems.com>
Signed-off-by: Marc Kleine-Budde <mkl@pengutronix.de>
Signed-off-by: Sasha Levin <sashal@kernel.org>

diff --git a/drivers/net/can/m_can/m_can.c b/drivers/net/can/m_can/m_can.c
index cf72a7e464ec4efbf57e8d1b8116f0bfe059d30e..b2224113987c7ad7044356fd4547d228ee7213b4 100644 (file)
--- a/drivers/net/can/m_can/m_can.c
+++ b/drivers/net/can/m_can/m_can.c
@@ -839,7 +839,7 @@ static int m_can_rx_peripheral(struct net_device *dev)
 {
        struct m_can_classdev *cdev = netdev_priv(dev);
 
-       m_can_rx_handler(dev, 1);
+       m_can_rx_handler(dev, M_CAN_NAPI_WEIGHT);
 
        m_can_enable_all_interrupts(cdev);