From 9897967515ffc46dfeefdf537420d1c644f6fdfc Mon Sep 17 00:00:00 2001
From: Jarkko Nikula <jarkko.nikula@linux.intel.com>
Date: Tue, 15 Sep 2020 16:47:15 +0300
Subject: [PATCH 1/7] can: m_can: process interrupt only when not runtime
 suspended
Git-commit: a1f634463aaf2c94dfa13001dbdea011303124cc
Patch-mainline: v5.10-rc5
References: git-fixes

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@linux.intel.com>
Link: https://lore.kernel.org/r/20200915134715.696303-1-jarkko.nikula@linux.intel.com
Signed-off-by: Marc Kleine-Budde <mkl@pengutronix.de>
Signed-off-by: Denis Kirjanov <denis.kirjanov@suse.com>
---
 drivers/net/can/m_can/m_can.c | 2 ++
 1 file changed, 2 insertions(+)

diff --git a/drivers/net/can/m_can/m_can.c b/drivers/net/can/m_can/m_can.c
index a78ab2424261..7059b51a2a8b 100644
--- a/drivers/net/can/m_can/m_can.c
+++ b/drivers/net/can/m_can/m_can.c
@@ -904,6 +904,8 @@ static irqreturn_t m_can_isr(int irq, void *dev_id)
 	struct net_device_stats *stats = &dev->stats;
 	u32 ir;
 
+	if (pm_runtime_suspended(priv->device))
+		return IRQ_NONE;
 	ir = m_can_read(priv, M_CAN_IR);
 	if (!ir)
 		return IRQ_NONE;
-- 
2.16.4