can: m_can: m_can_close(): don't call free_irq() for IRQ-less devices

JIRA: https://issues.redhat.com/browse/RHEL-90130

commit e4de81f
Author: Marc Kleine-Budde <[email protected]>
Date:   Mon Sep 30 19:02:30 2024 +0200

    can: m_can: m_can_close(): don't call free_irq() for IRQ-less devices

    In commit b382380 ("can: m_can: Add hrtimer to generate software
    interrupt") support for IRQ-less devices was added. Instead of an
    interrupt, the interrupt routine is called by a hrtimer-based polling
    loop.

    That patch forgot to change free_irq() to be only called for devices
    with IRQs. Fix this, by calling free_irq() conditionally only if an
    IRQ is available for the device (and thus has been requested
    previously).

    Fixes: b382380 ("can: m_can: Add hrtimer to generate software interrupt")
    Reviewed-by: Simon Horman <[email protected]>
    Reviewed-by: Markus Schneider-Pargmann <[email protected]>
    Link: https://patch.msgid.link/[email protected]
    Cc: <[email protected]> # v6.6+
    Signed-off-by: Marc Kleine-Budde <[email protected]>

Signed-off-by: Radu Rendec <[email protected]>

Author: rrendec

drivers/net/can/m_can/m_can.c

@@ -1724,7 +1724,8 @@ static int m_can_close(struct net_device *dev)
 		napi_disable(&cdev->napi);
 
 	m_can_stop(dev);
-	free_irq(dev->irq, dev);
+	if (dev->irq)
+		free_irq(dev->irq, dev);
 
 	m_can_clean(dev);