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can: m_can: Read register PSR only on error 

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

Signed-off-by: Markus Schneider-Pargmann <msp@baylibre.com>
Link: https://lore.kernel.org/all/20221206115728.1056014-4-msp@baylibre.com
Signed-off-by: Marc Kleine-Budde <mkl@pengutronix.de>
This commit is contained in:
Markus Schneider-Pargmann 2022-12-06 12:57:20 +01:00 committed by Marc Kleine-Budde
parent 5775793797
commit fac52bf786
1 changed files with 4 additions and 5 deletions
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9
drivers/net/can/m_can/m_can.c
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@ -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));