linux-kernel - [PATCH] can: m_can: m_can_close(): don't call free

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Message-Id: <20240930-m_can-cleanups-v1-1-001c579cdee4@pengutronix.de>
Date: Mon, 30 Sep 2024 19:45:57 +0200
From: Marc Kleine-Budde <mkl@...gutronix.de>
To: Chandrasekar Ramakrishnan <rcsekar@...sung.com>, 
 Vincent Mailhol <mailhol.vincent@...adoo.fr>, 
 "David S. Miller" <davem@...emloft.net>, Eric Dumazet <edumazet@...gle.com>, 
 Jakub Kicinski <kuba@...nel.org>, Paolo Abeni <pabeni@...hat.com>, 
 Tony Lindgren <tony@...mide.com>, Judith Mendez <jm@...com>, 
 Markus Schneider-Pargmann <msp@...libre.com>
Cc: linux-can@...r.kernel.org, netdev@...r.kernel.org, 
 linux-kernel@...r.kernel.org, kernel@...gutronix.de, 
 Marc Kleine-Budde <mkl@...gutronix.de>
Subject: [PATCH] can: m_can: m_can_close(): don't call free_irq() for
 IRQ-less devices

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")
Signed-off-by: Marc Kleine-Budde <mkl@...gutronix.de>
---
 drivers/net/can/m_can/m_can.c | 3 ++-
 1 file changed, 2 insertions(+), 1 deletion(-)

diff --git a/drivers/net/can/m_can/m_can.c b/drivers/net/can/m_can/m_can.c
index a978b960f1f1e1e8273216ff330ab789d0fd6d51..16e9e7d7527d9762d73a7ec47940c73c0976e05d 100644
--- a/drivers/net/can/m_can/m_can.c
+++ b/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);

---
base-commit: d505d3593b52b6c43507f119572409087416ba28
change-id: 20240930-m_can-cleanups-53ce4276f1b1

Best regards,
-- 
Marc Kleine-Budde <mkl@...gutronix.de>