This is a note to let you know that I've just added the patch titled can: m_can: process interrupt only when not runtime suspended to the 5.9-stable tree which can be found at: http://www.kernel.org/git/?p=linux/kernel/git/stable/stable-queue.git;a=summary The filename of the patch is: can-m_can-process-interrupt-only-when-not-runtime-su.patch and it can be found in the queue-5.9 subdirectory. If you, or anyone else, feels it should not be added to the stable tree, please let <stable@xxxxxxxxxxxxxxx> know about it. commit d8606cb3ca6a3e14a49c255c17c2e1c95b019436 Author: Jarkko Nikula <jarkko.nikula@xxxxxxxxxxxxxxx> Date: Tue Sep 15 16:47:15 2020 +0300 can: m_can: process interrupt only when not runtime suspended [ Upstream commit a1f634463aaf2c94dfa13001dbdea011303124cc ] Avoid processing bogus interrupt statuses when the HW is runtime suspended and the M_CAN_IR register read may get all bits 1's. Handler can be called if the interrupt request is shared with other peripherals or at the end of free_irq(). Therefore check the runtime suspended status before processing. Fixes: cdf8259d6573 ("can: m_can: Add PM Support") Signed-off-by: Jarkko Nikula <jarkko.nikula@xxxxxxxxxxxxxxx> Link: https://lore.kernel.org/r/20200915134715.696303-1-jarkko.nikula@xxxxxxxxxxxxxxx Signed-off-by: Marc Kleine-Budde <mkl@xxxxxxxxxxxxxx> Signed-off-by: Sasha Levin <sashal@xxxxxxxxxx> diff --git a/drivers/net/can/m_can/m_can.c b/drivers/net/can/m_can/m_can.c index e7264043f79a2..f3fc37e96b087 100644 --- a/drivers/net/can/m_can/m_can.c +++ b/drivers/net/can/m_can/m_can.c @@ -956,6 +956,8 @@ static irqreturn_t m_can_isr(int irq, void *dev_id) struct net_device_stats *stats = &dev->stats; u32 ir; + if (pm_runtime_suspended(cdev->dev)) + return IRQ_NONE; ir = m_can_read(cdev, M_CAN_IR); if (!ir) return IRQ_NONE;