Commit fac52bf7 authored by Markus Schneider-Pargmann's avatar Markus Schneider-Pargmann Committed by Marc Kleine-Budde
Browse files

can: m_can: Read register PSR only on error 



Only read register PSR if there is an error indicated in irqstatus.

Signed-off-by: default avatarMarkus Schneider-Pargmann <msp@baylibre.com>
Link: https://lore.kernel.org/all/20221206115728.1056014-4-msp@baylibre.com


Signed-off-by: default avatarMarc Kleine-Budde <mkl@pengutronix.de>
parent 57757937

drivers/net/can/m_can/m_can.c

+4 −5
Original line number Diff line number Diff line
@@ -910,7 +910,6 @@ static int m_can_rx_handler(struct net_device *dev, int quota, u32 irqstatus) 
	struct m_can_classdev *cdev = netdev_priv(dev);

	int rx_work_or_err;

	int work_done = 0;

	u32 psr;



	if (!irqstatus)

		goto end;
@@ -936,13 +935,13 @@ static int m_can_rx_handler(struct net_device *dev, int quota, u32 irqstatus) 
		}

	}



	psr = m_can_read(cdev, M_CAN_PSR);



	if (irqstatus & IR_ERR_STATE)

		work_done += m_can_handle_state_errors(dev, psr);

		work_done += m_can_handle_state_errors(dev,

						       m_can_read(cdev, M_CAN_PSR));



	if (irqstatus & IR_ERR_BUS_30X)

		work_done += m_can_handle_bus_errors(dev, irqstatus, psr);

		work_done += m_can_handle_bus_errors(dev, irqstatus,

						     m_can_read(cdev, M_CAN_PSR));



	if (irqstatus & IR_RF0N) {

		rx_work_or_err = m_can_do_rx_poll(dev, (quota - work_done));