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can: m_can: m_can_get_berr_counter(): don't wake up controller if interface is down

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If the interface is down, the CAN controller might be powered down, the
clock disabled, and/or it's external reset asserted.

Don't wake up the controller to read the CAN bus error counters, if the
interface is down.

Reviewed-by: Markus Schneider-Pargmann <msp@baylibre.com>
Link: https://patch.msgid.link/20251008-m_can-cleanups-v1-7-1784a18eaa84@pengutronix.de
Signed-off-by: Marc Kleine-Budde <mkl@pengutronix.de>
This commit is contained in:
Marc Kleine-Budde 2025-08-06 12:20:44 +02:00
parent b24b43522e
commit 91a55c72a8
1 changed files with 4 additions and 0 deletions
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4
drivers/net/can/m_can/m_can.c
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@ -791,6 +791,10 @@ static int m_can_get_berr_counter(const struct net_device *dev,
struct m_can_classdev *cdev = netdev_priv(dev);
int err;
/* Avoid waking up the controller if the interface is down */
if (!(dev->flags & IFF_UP))
return 0;
err = m_can_clk_start(cdev);
if (err)
return err;