linux-kernel - [PATCH 5.4 087/158] can: m_can: m_can_stop(): set device to software init mode before closing

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Message-Id: <20201123121824.131320309@linuxfoundation.org>
Date:   Mon, 23 Nov 2020 13:21:55 +0100
From:   Greg Kroah-Hartman <gregkh@...uxfoundation.org>
To:     linux-kernel@...r.kernel.org
Cc:     Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
        stable@...r.kernel.org, Faiz Abbas <faiz_abbas@...com>,
        Dan Murphy <dmurphy@...com>,
        Marc Kleine-Budde <mkl@...gutronix.de>,
        Sasha Levin <sashal@...nel.org>
Subject: [PATCH 5.4 087/158] can: m_can: m_can_stop(): set device to software init mode before closing

From: Faiz Abbas <faiz_abbas@...com>

[ Upstream commit a584e9bc1b7e88f24f8504886eafbe6c73d8a97c ]

There might be some requests pending in the buffer when the interface close
sequence occurs. In some devices, these pending requests might lead to the
module not shutting down properly when m_can_clk_stop() is called.

Therefore, move the device to init state before potentially powering it down.

Fixes: e0d1f4816f2a ("can: m_can: add Bosch M_CAN controller support")
Signed-off-by: Faiz Abbas <faiz_abbas@...com>
Acked-by: Dan Murphy <dmurphy@...com>
Link: https://lore.kernel.org/r/20200825055442.16994-1-faiz_abbas@ti.com
Signed-off-by: Marc Kleine-Budde <mkl@...gutronix.de>
Signed-off-by: Sasha Levin <sashal@...nel.org>
---
 drivers/net/can/m_can/m_can.c | 3 +++
 1 file changed, 3 insertions(+)

diff --git a/drivers/net/can/m_can/m_can.c b/drivers/net/can/m_can/m_can.c
index 85e3df24e7bfb..661db85d569ce 100644
--- a/drivers/net/can/m_can/m_can.c
+++ b/drivers/net/can/m_can/m_can.c
@@ -1366,6 +1366,9 @@ static void m_can_stop(struct net_device *dev)
 	/* disable all interrupts */
 	m_can_disable_all_interrupts(cdev);
 
+	/* Set init mode to disengage from the network */
+	m_can_config_endisable(cdev, true);
+
 	/* set the state as STOPPED */
 	cdev->can.state = CAN_STATE_STOPPED;
 }
-- 
2.27.0