6.11-stable review patch. If anyone has any objections, please let me know.
------------------
From: Marc Kleine-Budde mkl@pengutronix.de
commit e4de81f9e134c78ff7c75a00e43bd819643530d0 upstream.
In commit b382380c0d2d ("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: b382380c0d2d ("can: m_can: Add hrtimer to generate software interrupt") Reviewed-by: Simon Horman horms@kernel.org Reviewed-by: Markus Schneider-Pargmann msp@baylibre.com Link: https://patch.msgid.link/20240930-m_can-cleanups-v1-1-001c579cdee4@pengutron... Cc: stable@vger.kernel.org # v6.6+ Signed-off-by: Marc Kleine-Budde mkl@pengutronix.de Signed-off-by: Greg Kroah-Hartman gregkh@linuxfoundation.org --- drivers/net/can/m_can/m_can.c | 3 ++- 1 file changed, 2 insertions(+), 1 deletion(-)
--- a/drivers/net/can/m_can/m_can.c +++ b/drivers/net/can/m_can/m_can.c @@ -1764,7 +1764,8 @@ static int m_can_close(struct net_device 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);