iv/linux
1
0
Fork 0
Code Issues Pull Requests Actions Packages Projects Releases Wiki Activity

can: m_can: process interrupt only when not runtime suspended

Browse Source 
[ 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@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: Sasha Levin <sashal@kernel.org>
This commit is contained in:
Jarkko Nikula 2020-09-15 16:47:15 +03:00 committed by Greg Kroah-Hartman
parent a3c94201e0
commit 56588c1fdd
1 changed files with 2 additions and 0 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

2
drivers/net/can/m_can/m_can.c
View File

@ -913,6 +913,8 @@ 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;