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;
