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]>

Author: marckleinebudde

drivers/net/can/m_can/m_can.c

@@ -1765,7 +1765,8 @@ static int m_can_close(struct net_device *dev)
 	netif_stop_queue(dev);
 
 	m_can_stop(dev);
-	free_irq(dev->irq, dev);
+	if (dev->irq)
+		free_irq(dev->irq, dev);
 
 	m_can_clean(dev);