netdev - [net 11/11] can: m_can: m_can_rx_peripheral(): fix RX being blocked by errors

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Message-Id: <20210316082104.4027260-12-mkl@pengutronix.de>
Date:   Tue, 16 Mar 2021 09:21:04 +0100
From:   Marc Kleine-Budde <mkl@...gutronix.de>
To:     netdev@...r.kernel.org
Cc:     davem@...emloft.net, kuba@...nel.org, linux-can@...r.kernel.org,
        kernel@...gutronix.de,
        Torin Cooper-Bennun <torin@...iluxsystems.com>,
        Marc Kleine-Budde <mkl@...gutronix.de>
Subject: [net 11/11] can: m_can: m_can_rx_peripheral(): fix RX being blocked by errors

From: Torin Cooper-Bennun <torin@...iluxsystems.com>

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@...gutronix.de>
Signed-off-by: Torin Cooper-Bennun <torin@...iluxsystems.com>
Signed-off-by: Marc Kleine-Budde <mkl@...gutronix.de>
---
 drivers/net/can/m_can/m_can.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/drivers/net/can/m_can/m_can.c b/drivers/net/can/m_can/m_can.c
index d783c46cac16..0c8d36bc668c 100644
--- a/drivers/net/can/m_can/m_can.c
+++ b/drivers/net/can/m_can/m_can.c
@@ -873,7 +873,7 @@ 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);
 
-- 
2.30.1