linux-kernel - [PATCH 5.4 76/98] can: m_can: m_can_open(): remove IRQF_TRIGGER_FALLING from request_threaded

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Message-Id: <20201201084658.783493642@linuxfoundation.org>
Date:   Tue,  1 Dec 2020 09:53:53 +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, Dan Murphy <dmurphy@...com>,
        Sriram Dash <sriram.dash@...sung.com>,
        Pankaj Sharma <pankj.sharma@...sung.com>,
        Marc Kleine-Budde <mkl@...gutronix.de>,
        Sasha Levin <sashal@...nel.org>
Subject: [PATCH 5.4 76/98] can: m_can: m_can_open(): remove IRQF_TRIGGER_FALLING from request_threaded_irq()s flags

From: Marc Kleine-Budde <mkl@...gutronix.de>

[ Upstream commit 865f5b671b48d0088ce981cff1e822d9f7da441f ]

The threaded IRQ handler is used for the tcan4x5x driver only. The IRQ pin of
the tcan4x5x controller is active low, so better not use IRQF_TRIGGER_FALLING
when requesting the IRQ. As this can result in missing interrupts.

Further, if the device tree specified the interrupt as "IRQ_TYPE_LEVEL_LOW",
unloading and reloading of the driver results in the following error during
ifup:

| irq: type mismatch, failed to map hwirq-31 for gpio@...8000!
| tcan4x5x spi1.1: m_can device registered (irq=0, version=32)
| tcan4x5x spi1.1 can2: TCAN4X5X successfully initialized.
| tcan4x5x spi1.1 can2: failed to request interrupt

This patch fixes the problem by removing the IRQF_TRIGGER_FALLING from the
request_threaded_irq().

Fixes: f524f829b75a ("can: m_can: Create a m_can platform framework")
Cc: Dan Murphy <dmurphy@...com>
Cc: Sriram Dash <sriram.dash@...sung.com>
Cc: Pankaj Sharma <pankj.sharma@...sung.com>
Link: https://lore.kernel.org/r/20201127093548.509253-1-mkl@pengutronix.de
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 | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/drivers/net/can/m_can/m_can.c b/drivers/net/can/m_can/m_can.c
index 246fa2657d744..eafdb4441d441 100644
--- a/drivers/net/can/m_can/m_can.c
+++ b/drivers/net/can/m_can/m_can.c
@@ -1605,7 +1605,7 @@ static int m_can_open(struct net_device *dev)
 		INIT_WORK(&cdev->tx_work, m_can_tx_work_queue);
 
 		err = request_threaded_irq(dev->irq, NULL, m_can_isr,
-					   IRQF_ONESHOT | IRQF_TRIGGER_FALLING,
+					   IRQF_ONESHOT,
 					   dev->name, dev);
 	} else {
 		err = request_irq(dev->irq, m_can_isr, IRQF_SHARED, dev->name,
-- 
2.27.0