netdev - [PATCH RFC] can: m_can: Release irq on error in m_can

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Message-Id: <20240730-mcan-irq-v1-1-f47cee5d725c@kernel.org>
Date: Tue, 30 Jul 2024 12:12:21 +0100
From: Simon Horman <horms@...nel.org>
To: Chandrasekar Ramakrishnan <rcsekar@...sung.com>, 
 Marc Kleine-Budde <mkl@...gutronix.de>, 
 Vincent Mailhol <mailhol.vincent@...adoo.fr>
Cc: "David S. Miller" <davem@...emloft.net>, 
 Eric Dumazet <edumazet@...gle.com>, Jakub Kicinski <kuba@...nel.org>, 
 Paolo Abeni <pabeni@...hat.com>, Vivek Yadav <vivek.2311@...sung.com>, 
 linux-can@...r.kernel.org, netdev@...r.kernel.org
Subject: [PATCH RFC] can: m_can: Release irq on error in m_can_open

It appears that the irq requested in m_can_open() may be leaked
if an error subsequently occurs: if m_can_start() fails.

Address this by calling free_irq in the unwind path for
such cases.

Flagged by Smatch.
Compile tested only.

Fixes: eaacfeaca7ad ("can: m_can: Call the RAM init directly from m_can_chip_config")
Signed-off-by: Simon Horman <horms@...nel.org>
---
 drivers/net/can/m_can/m_can.c | 5 ++++-
 1 file changed, 4 insertions(+), 1 deletion(-)

diff --git a/drivers/net/can/m_can/m_can.c b/drivers/net/can/m_can/m_can.c
index 14b231c4d7ec..205a6cb4470f 100644
--- a/drivers/net/can/m_can/m_can.c
+++ b/drivers/net/can/m_can/m_can.c
@@ -2009,7 +2009,7 @@ static int m_can_open(struct net_device *dev)
 	/* start the m_can controller */
 	err = m_can_start(dev);
 	if (err)
-		goto exit_irq_fail;
+		goto exit_start_fail;

 	if (!cdev->is_peripheral)
 		napi_enable(&cdev->napi);
@@ -2018,6 +2018,9 @@ static int m_can_open(struct net_device *dev)

 	return 0;

+exit_start_fail:
+	if (cdev->is_peripheral || dev->irq)
+		free_irq(dev->irq, dev);
 exit_irq_fail:
 	if (cdev->is_peripheral)
 		destroy_workqueue(cdev->tx_wq);